For TBI engines or applications where the injector discharges above or before the throttle blade(s), the vacuum/boost port should be left disconnected and open to atmosphere, never blocked or plugged. Check for vacuum hose damage, a loose connection or an obstruction in the line or the connection port. Jay Leno has the first look at the 2020 Chevrolet Corvette Stingray - Jay Leno's Garage - Duration: 7:46. That is a place that will have vacuum on it when the engine is running at an idle. A typical vacuum test gauge reads in inches of mercury. Throttle body injection relies on MAP sensors for fuel control. Interestingly, the brake pedal came up over an inch, since its booster vacuum source is the manifold. Some like to put a vacuum gauge on it, but you'd probably be able to feel it by. If you are looking for 1990 Chevy 350 Tbi Vacuum Line Diagram you've come to the right place. I went out and was looking at the fuel pressure gauge and when i moved it the pressure suddenly jumped. Their Fuel Systems Division has given us the opportunity to tune everything from NHRA drag race cars, off-road race trucks and Sprint Cup cars. Designed to provide high efficiency, maximum flow capacity, and minimum leakage. This product has variations available for quick shipping. Swap Details. We have 19 images about 1990 Chevy 350 Tbi Vacuum Line Diagram including images, pictures, photos, wallpapers, and more. Should be at least 14-18 inches of vacuum. Purpose of the Rising Rate Regulator The Cartech regulators are designed specifically to add fuel to modified EFI engines (turbos, superchargers, and normally aspirated). Chevrolet Performance Parts - 12496821 - TBI Intake for Vortec Heads. GM Engines 12681430 - TBI 350 LO5 New Crate Engine Free Shipping on a New TBI 350 Chevy Engine 12681430 From the Number 1 Chevrolet Performance Dealer in the World SDPC. This manifold is primarily intended for use with Vortec heads on pre-1996 engine blocks. this is a problem i have been working on for months. New and Used Car and Truck Parts and Accessories On Sale. com, the official website for Custom Classic Trucks Magazine!. On the 4 barrel, you may wish to install a fuel pressure gauge to monitor TBI fuel pressure. Search Fixya SOURCE: 88 chev,350, stick,2wd, 3500, gas flows to. RED gauge - RPM White gauge - Vacuum [bar] ( 1 inch Hg = 0. Pretty much any of the cams I recommend or have listed on the website will pull at least 17-18″ of vacuum at idle. The compound gauges allow the HVAC technician to measure both pressure. 1988 chevy 1500 350 tbi bogs down with acceleration or under load and hills - Answered by a verified Chevy Mechanic with vacuum gauge. INSTALLATION OF PRODUCTION GM AND 670 CFM 2 BARREL THROTTLE BODY FUEL INJECTION KITS ON FORMERLY CARBURETED ENGINES. FUEL SERVICE TOOLS 68 Fuel Service Tools Fuel Injection Diagnostic Set With these sets, you can quickly and accurately diagnose fuel pressure problems on Chrysler, Ford, GM, or Jeep engines that have multi-port fuel injection systems. If you suspect a vacuum leak on a carbureted or TBI engine, you may be able to verify your suspicion by performing a simple check. Ls1 Ls2 Ls6 Swap Retrofit Coolant Gauge Wiring Harness Harness Control Main Blower 84 C4 Tpi Vacuum Hoses. Injectors are brand new as well as everything in the TBI. im thinking about goin with a TBI™ from a 454 with the 2 inch barrels rather than sticking with my 350 TBI™ that has inch and eleven sixteenths barrels. 7 block in it, bored over to a 355, injector spacer, otherwise stock. So no problem, I needed a stronger motor anyway. Once i plugged the. The MKS, Granville-Phillips® 350 Bayard-Alpert Ultra High Vacuum (UHV) Gauge Controller operates a 274 Nude Bayard-Alpert ionization vacuum gauge in a compact half-rack design. The series thus covers the technically relevant vacuum range from ultra-high vacuum to overpressure. I have an 87 350 TBI and it. This measurement is typical of a vehicle at sea level. Ion gauge controllers, ion gauge tubes, and convectron sensors are also available but sold separately. Sep 8, 2015 at 4:52. Rugged versatile performance. Oh, I also rebuilt the TBI, which helped big time too. I am in the process of getting a fuel pressure gauge, but since the GM TBI systems need a special adaptor, I am likely going to have to order one. 0 COMMANDER 950 SYSTEM INSTALLATION. Is tnhis normal for TBI vs. Additionally, a gauge can help you spot other issues like valve train problems, exhaust obstructions, etc. Changing the throttle body gasket didn't locate any leaks. Cliq is the medical division and brand of DHCL Group (Ding Hwa Co. There is a test with a vacuum gauge to determine if you have a restrictive cat, but it does not sound like you have one. For ignition, I'm running an MSD 6A and an MSD HEI vacuum advance distributor with Blaster 2 coil. Each temperature compensated gauge incorporates a stainless steel multi-coil Bourdon tube with a tip bleeder for maximum accuracy, and a mirrored scale to eliminate parallax. could 44 is a lean condituon. My chevy 1987 chevy Scottsdale with a 350 tbi sometime runs smooth then sometimes runs like its running with half the power or less like it has bad gas or something. I'm running out of ideas. I have heard people say to use all sorts of things but starting fluid works. With engine idling use starting fluid and small bursts to anywhere you could have a vacuum leak and watch for the idle to raise. Aftermarket oil pressure gauge installation kit makes it has it might use a remarkable. 86-95 GM TBI Fuel Pressure Gauge. Find Pressure Gauges at MSC Industrial Supply, serving the metalworking, safety, and MRO industries for over 75 years Pressure & Vacuum Gauges & Instruments /. Discover Sbc Tbi on sale right here with the largest option of Sbc Tbi anywhere online. Unlike a port fuel injection system, that sprays fuel into the intake manifold runner just above the intake valve, the injectors in this system spray fuel directly into the throttle body. I just today bought the Sniper Master Kit and have been looking at peoples post with low vacuum. These vehicles featured a 350 ci, 5. If you have access to a scan tool use a hook up for a 1990 350 cu. You can use a late 80’s or early 90’s GM TBI definition. requires and the may be. If so, use the 1/8” NPT port on the left rear of TBI. Purpose of the Rising Rate Regulator The Cartech regulators are designed specifically to add fuel to modified EFI engines (turbos, superchargers, and normally aspirated). Performance data for the VP90-300 & 350 max series modular venturi vacuum pumps is displayed, listing air consumption, vacuum flow at various vacuum levels, and evacuation times (for 1 cu. No matter how I ran the harness it was short. 1987 Camaro TPI Wiring Harness. Taking a vacuum reading from the large port at the back of the carb shows 9"-10" of vacuum on the gauge. 050 number is, the longer the valve will be off the seat (hence the term duration), which will affect vacuum. They, however, not always succeed, and the design of the dashboard or gauges in their factory stock condition can be not as good as you want them to be. Another place to look is the PCV valve. • Check for vacuum leaks (smoke machine or equivalent recommended) • Check out on a scanner – we need scan tool data codes & readings to help solve the issue! Fuel Pressure should be set to 37-45 PSI with the engine running, vacuum line on the fuel pressure regulator. General Tech - TBI performance tips - anybody got any secrets or tricks for making these TBI units work the way they did new? i have a 87tbi 350; it has new GM (right from the dealer) TPS and iac valves, and yet it still likes to stick on high idle, about 1000 rpms, 850 when its in gear, and some days it will drop. Mount the low-vac switch on the firewall beside the master cylinder, right by the plastic sleeve with all the vacuum hoses going through it. ThrottleBodyInjection. why can't I just get my vehicles to run right for one week? I think the oil pump crapped out in the xj, so now I'm driving the 93 chevy, heres whats going on: 1993 chevy k1500 - 5. The 275 Convectron® Pirani Vacuum Gauge delivers fast response time - in milliseconds - compared to thermocouple-type gauges that respond in seconds. Try a vacuum gauge to watch how the engine is loaded in each gear. This included: Manifold gauge set with 91cm long hoses. GlowShift's 7 Color Series Triple Gauge Package was made for the 1999-2007 Ford Super Duty Power Stroke F-250 and F-350 with either a 6. The series thus covers the technically relevant vacuum range from ultra-high vacuum to overpressure. there is a local tuner that can dynotest and tune for about $350. The 350 Bayard-Alpert UHV Gauge Controller operates a Series 274 nude Bayard-Alpert type ionization gauge in a compact half-rack design. This page is dedicated to the owners of these vehicles equipped with GM's dual point fuel injection (model 220 TBI). The General Motors Rochester Throttle Body (TBI) is OEM original equipment. RTH diagnosing 1990 350tbi stumble/stall when warm. Buy GM TBI FUEL PRESSURE ADAPTER: Fuel Pressure Testers - Amazon. 350 small block, Holley carb: 4 barrel, double pump. Made from sturdy ABS. There is a test with a vacuum gauge to determine if you have a restrictive cat, but it does not sound like you have one. 7 small block Chevy with TBI (throttle body injected) EFI system and swirl port heads. hello all, long time watcher, first time asker lol. Painless Wiring makes the conversion from Carburetor to TBI real easy with there fuel injection wiring harness and a parts list of everything you need to make the switch. Cables, ion gauge tubes are available but sold separately. These vehicles featured a 350 ci, 5. How to Use Starting Fluid to Check Fuel Pump. It's a new project I'm fixing up to use as a hunting truck. Code 32: EGR System Problem. Find CHEVROLET 5. Granville-Phillips® Series 340 Vacuum Gauge Controller Catalog numbers for Series 340 Controllers Controller for one Ionization gauge and two Convectron Gauges, with one-line display,. the fuel gauge is all the way to the right showing way past full and will not move. Then read gauge and move the distributor until you get the. Injectors are brand new as well as everything in the TBI. You can also measure this with a multimeter. Vacuum gauge. Manufacturers install ports on their manifolds for lots of different reasons: Brake Booster, PCV tube, EGR Switch, A/C vents. I don't believe there is a leak, I tested with a vacuum gauge and the vacuum holds steady. When using the Guard, the maximum range that can be applied to this Guard installed on the Gauge is 30 in. Fuel: I sent up my fuel system a little different then Mykk, Here is what i used. After our transmission has been installed, it is critical that the vacuum system is checked and repaired to insure proper operation of our transmission. 2 barrel TBI's have an adequate built-in torsion spring. A vacuum gauge is an invaluable resource for tracking down engine issues. RED gauge - RPM White gauge - Vacuum [bar] ( 1 inch Hg = 0. The Type 1259 process gauge is offered with an as-welded Bourdon tube to ensure safety and a long life. com FREE DELIVERY possible on eligible purchases. RECOMMENDED 350 TBI MODS buying a regulator and a fuel pressure gauge to set that regulator by. On the 4 barrel, you may wish to install a fuel pressure gauge to monitor TBI fuel pressure. Catalog Shinko Seiki Vacuum Pump For more information please visit us at www. Re: high idle with tbi 350 08-23-06 12:30 PM - Post# 989933 In response to bowtie-badboy High idle is most likely going to be a vacuum leak, whether due to something actually leaking (base gasket, hose, etc. ) or a "controlled" leak a. To many owners of the older Mercedes diesel cars, the vacuum system continues to be an amazing mystery. Code 32: EGR System Problem. An engine's vacuum readings can tell an awful lot about its running parameters, provided you know how to read the gauge in the first place. i have had the truck to 3 garages 2 of the garages were dealership garages. a carb'd engine?. Wide range vacuum pressure measurement from atmosphere to 1x10-4 Torr Individually calibrated gauges assure the highest measurement performance Easy installation in space-restricted. Our vacuum gauges, transducers, sensors and controllers are based on multiple pressure measurement technologies including Convectron®, Micro-Ion®, MicroPirani. Hook a vacuum gauge to direct vacuum port on intake. Jay Leno has the first look at the 2020 Chevrolet Corvette Stingray - Jay Leno's Garage - Duration: 7:46. The DPG8001 Series of digital pressure gauges offer 0. Bad TPS? 1991 chevy 350 TBI Discussion in ' One thing i did notice is that when i depress the egr with the vacuum hose off and my finger over the vacuum hole, the. Vacuum users worldwide turn to MKS, Granville-Phillips® products for reliable, precise, dependable vacuum measurement technology for measuring pressure from 10-11 to 1500 Torr. 1993 K1500 Sierra 350 TBI with 174k miles Engine has been rebuilt with around 35k on the rebuild. 1) I'm assuming that I can't use my C4B intake. The latest word from Howell is that the TBI left and right vacuum connections are hard vacuum while the lower center one is ported vacuum. Applications include small block Chevy engines 283, 305, 327, 350 and 400 using late Vortec or TBI center bolt style cylinder heads. TPG 362 and TPG 366 enable up to 6 ActiveLine gauges to be. Syncing the two gauges to themselves was done easily by removing the cover, setting pointers in their appropriate locations, then using fine adjustment screws to set both gauges up exactly on a common vacuum source (IMHO, this should be done before using on any sync gauge set). So I'm wanting to convert the TBI to carb and I have some questions on what parts I can take off my old sbc for re-use. 350 1961 Learn More. The wire colors are the same as the factory wire colors for car and truck TBI injected engines. the tachometer reads eraticly says car idles at 6000 rpm. NOTE: Can tap R134a for connection to our cans are not included, available in accessories. Designed to provide high efficiency, maximum flow capacity, and minimum leakage. We continue to work to deliver the functionality, durability and high quality finish that have earned our products a best-in-class reputation, worldwide. 7 block in it, bored over to a 355, injector spacer, otherwise stock. I have a 93 k1500 350 TBI and when i got her back on the road a few weeks ago i noticed the engine bogs out at stops and has a slow response time after about 45. that replaced the dash switch and all the vacuum system. Due to the effect of the external atmospheric. 7 small block Chevy with TBI (throttle body injected) EFI system and swirl port heads. Next morning starts all over again. Failure to use the Gauge Guard will damage the gauge. 60KPA is close to 1/2 throttle on a normal TBI 350 truck so you have some major vacuum issues going on which is causing the motor to run WAY TOO rich at low throttle levels but at high throttle the data shows the motor is going extremely lean so I don't know what is going on there but you have some serious issues to find. the 305 uses the one wire sensors where the 350 has two wire. So I have an 87 Silverado half ton. have a 87 gta trans am 350 with tpi. Unfortunately, most vacuum gauge manufacturers don't provide easy-to-follow instructions and diagrams to help users interpret gauge readings, rendering the gauges themselves virtually useless. 4 d4d 1nd-tv I just bought a '95 K1500 GMC w/ 350 TBI and 166k miles. The TBI and the ECM are remanufactured the rest of the parts NEW Fuel pump NEW Small Cap Distributor (except the upgrade large cap distributor is a remanufactured with new ignition module and pickup coil) The adaptor plate is a custom CNC machined plate that is pocketed to draw off all 4 holes (barrels) on your intake manifold. Hope this was a help, Jaybird. Bad TPS? 1991 chevy 350 TBI Discussion in ' One thing i did notice is that when i depress the egr with the vacuum hose off and my finger over the vacuum hole, the. Loading Unsubscribe from sammack93? How to Use a Vacuum Gauge for Diagnostics - Duration: 10:25. What is the barometric pressure circuit on a 88 Chevy tbi 350?. It took about an hour to install it, the self tune feature is perfect. I tried the 4. One branch runs to the EGR control valve, the other branch runs to the air control valve for the smog pump. Our patented design enables each cylinder to draw air and fuel from both throttle bores. Mine has been in the cruiser for over 106K miles. Good catch. JET Performance Adjustable Fuel Pressure Regulators allow adjusting fuel pressure for maximum efficiency and horsepower gains. Get the best deal for Vacuum Gauges for Ford F-350 from the largest online selection at eBay. Note: Other than discoloration of the dial and hardening of the gasketing that may occur as ambient or process temperatures. First, I carefully cut off the blue/red case with a utility knife; a cut lengthwise to split the case in half and push the metal connector out (you can buy these connectors without the case, too). If so, use the 1/8” NPT port on the left rear of TBI. It has the L05 TBI 350 and MG5 manual transmission. The result is much more air flow and equalized fuel. 7 Idle surging,stalling in the alt. 350 small block, Holley carb: 4 barrel, double pump. Purpose of the Rising Rate Regulator The Cartech regulators are designed specifically to add fuel to modified EFI engines (turbos, superchargers, and normally aspirated). Please read this entire publication before starting work. Other than that it is stock. Vacuum Gauge Engine Performance Testing A vacuum gauge shows the difference between outside atmospheric pressure and the amount of vacuum present in the intake manifold. If a vacuum gauge is attached to an engine and reads 15 inches of mercury, it means the low-pressure region created in the engine is. Menu and widgets. on a tbi motor, driver side has a tube that goes to a spacer between the air cleaner and the tbi unit and the passenger side has the pcv valve hooked to the tbi in the front vacume port, the vortec motor is not a tbi motor it uses port injection. Centerline Acquires International Auto Parts. Just installed a rebuilt 350 and when i put on the brake kind of hard it dies and lacks get up and go. These vehicles featured a 350 ci, 5. • Check for vacuum leaks (smoke machine or equivalent recommended) • Check out on a scanner – we need scan tool data codes & readings to help solve the issue! Fuel Pressure should be set to 37-45 PSI with the engine running, vacuum line on the fuel pressure regulator. 7 block in it, bored over to a 355, injector spacer, otherwise stock. Disassemble unit, replaced oring and some gaskets. Gm Tbi 40hp Power Up Kit 1986-95 Sbc 2. for a GM TBI application to read the data, or to check for stored codes. Ok I hooked up the vacuum gauge at the pcv port off the tbi and got a reading of 15 and then it went to right in the middle of 15 and 16 and it did not jump around at all. How to Use a Fuel Pressure Gauge to Check Fuel Pressure on TBI Equipped Pickups and SUVs. I have a 95 Yukon, 350 tbi. Definitely not the EGR, comp. It is now considered to be one of the finest overdrive automatic transmissions ever produced. "Ported Vacuum" runs to the fuel evaporation canister. Ok I hooked up the vacuum gauge at the pcv port off the tbi and got a reading of 15 and then it went to right in the middle of 15 and 16 and it did not jump around at all. So I'm wanting to convert the TBI to carb and I have some questions on what parts I can take off my old sbc for re-use. com, the official website for Custom Classic Trucks Magazine!. I replaced the TBI gasket again, just to be sure. Gauge reading: 0-38hg Each gauge has its own individual damping control and Calibration Control >Gauges are mounted to a heavy metal base intended for bench top use. Re: 1988 350 TBI idles funny, stalls when put in gear, and accels rough I rebuilt the FPR with the Autozone kit, which included a new spring and used the new spring. To check manifold pressure with a vacuum gauge, you need to locate a port on the intake manifold or throttle body. I just received the truck from my dad and im trying to diagnose some issues it has had for some time. Off-Road Forums & Discussion Groups (https://forums. DO NOT USE the port in the back of the TBI unit for the MAP vacuum any longer, the best location is in the front of the unit or from a separate manifold vacuum source. The truck runs fine while driving and will idle when the engine is cold. It also has a pressure limit of 20’Hg-15 psi. GM ATK Base Engines. I replaced the TBI gasket again, just to be sure. Don't know about the canister except what was stated before about the cam. fuel pressure gauge has a 1/8" NPT fitting and reads up to 15. 7 small block Chevy with TBI (throttle body injected) EFI system and swirl port heads. Manufacturers install ports on their manifolds for lots of different reasons: Brake Booster, PCV tube, EGR Switch, A/C vents. prevent binding. Syncing the two gauges to themselves was done easily by removing the cover, setting pointers in their appropriate locations, then using fine adjustment screws to set both gauges up exactly on a common vacuum source (IMHO, this should be done before using on any sync gauge set). I'm getting 5 in. 350 HO Engine (19210007) Specifications This publication provides general information on components and procedures which may be useful when installing or servicing a 350 HO engine. See the webmaster's note at the bottom. About the only time you’ll need your manifold gauge set is when you need to evacuate or add refrigerant to the system. Sometimes it idles almost alright, but then when I take off, it runs like crap. Is the vacuum gauge needle actually jumping at a rate consistent with the (mis)firing of a particular cylinder? - runs smooth at idle, runs smooth at cruise. "PCV hose connection" - yup "Right Manifold Vacuum" used to run into the cab to a vacuum gauge, but I plugged it when I was searching for vacuum leaks. GM TBI Adapter 7/16. Hg for every 1000 ft. it idles great but if i put it in any gear except neutral and pa…. the tachometer reads eraticly says car idles at 6000 rpm. I saw 220 F in the trans. I am going to pick up a pressure gage tonight, what should the vacuume be at the map sensor. Typical TBI motor will idle with 20-21 inches of vacuum stock. Diagram of vacuum lines on chevy 350 tbi thank you for visiting our site, this is images about diagram of vacuum lines on chevy 350 tbi posted by Brenda Botha in Diagram category on Sep 26, 2019. For vacuum going to the low-vacuum switch you will need to use a manifold vacuum source. Running cool (160 F) What I've done so far: 1. Running very, down on power. The Gauge Guard Liquid has to be filled under a vacuum. To ensure the same OEM Throttle Body Injection (TBI) for the vehicle please enter all the required information about your TBI and vehicle in the text boxes below. What is needed to make a 1995 tbi 350 to a vortec 350? This is what you will need. All I needed vacuum for was the transmission, so I ended up tapping into the 11/32" brake booster line. 0 COMMANDER 950 SYSTEM INSTALLATION. 350 tbi misfire: Sign In hello, I've got an 89 350 tbi chevy that has a misfire. The PV 350 can eliminate the need for a bulky manifold gauge set in many troubleshooting situations. This will provide gains until the rpm at which the neck becomes the greatest restriction. php) (https://forums. A vacuum test is one of the simplest and most effective diagnostic weapons the shade-tree mechanic has in his arsenal. With the engine idling and the fuel pressure gauge connected, plug in the hand-held vacuum pump to the FPR in place of the vacuum line. with straight dual exhaust with mufflers and no cats no cross over pip or H pip. I don't think it's anything with the ignition system, I have a new coil, cap, points, condenser, wires, plugs. For GM TBI systems, please refer to my GM TBI Swap page. Low or fluctuating vacuum can indicate a leak. Then read gauge and move the distributor until you get the. the tachometer reads eraticly says car idles at 6000 rpm. Do you remove the vacuum line that goes to the distributor and hook it up there? Aren't you supposed to have the distributor hooked up when adjusting idle mixture. 19 to 21 inches of vacuum at an idle, The higher the better. how can I get around this?. The hot cathode ion gauge measures high vacuum pressure from 10-3 to 10-11 Torr. Get full 1995 Chevy Truck Tahoe 4WD V8-350 5. Gauge reading: 0-38hg Each gauge has its own individual damping control and Calibration Control >Gauges are mounted to a heavy metal base intended for bench top use. Yet, the idle is way too high. 1989 K5 TBI 350 Problems Plugs, TCM (for temp gauge), checked EGR and looks fine, and check the injectors and they look to be spraying well. Swap Details. I have used propane, carb cleaner, and wd40 to try to locate leaks. Vacuum Pump Sales & Service Tel. Cruising on flat level ground in OD at 55 I only see about 7-10 inches. After the timing adjustment I was able to get it to idle but it was mildly to. I have power brakes and have had no issues at 850 RPM. 350 TBI Flooding probs! need help ASAP! of the ordinary with the gauges is that the oil pressure gauge goes thru the roof when i turn the key to the on position. It is now considered to be one of the finest overdrive automatic transmissions ever produced. Most of the time, highest vacuum, will also have you running way past 36 degrees of total advance, which means you WILL destroy your engine. Couple of questions: Did you hook up the oxygen sensor? Look to see that the O2 sensor is switching from rich to lean in the scan tool. this is a problem i have been working on for months. The truck has a NV3500 so the whole truck would surge. It's not the vacuum booster tested it and it is working. The INFICON Pirani Standard Gauges, PSG500, PSG502-S, PSG510-S and PSG512-S, employ the most advanced digital Pirani technology available in themarketplace. PSG5xx ATM to Medium Vacuum Gauge. Do you remove the vacuum line that goes to the distributor and hook it up there? Aren't you supposed to have the distributor hooked up when adjusting idle mixture. Kinda nice not having to mess with some calibrations when I'm pulling stock vacuum. The gauges are well built, easy to read and display nicely. Simply install a Performance Fuel Systems EFI Gauge Kit on the fuel service port schrader valve (follow the instructions supplied with the kit). This included: Manifold gauge set with 91cm long hoses. A2C53416883-S 150 PSI Air Pressure Gauge 12/24V, Use with 3-180 Ohm Sender Learn More. I couldn’t be more pleased with the way it works and performs. 7L TBI - PPoor runing engine- Please Help Sign 1998 5. You can use a late 80's or early 90's GM TBI definition. com, the official website for Custom Classic Trucks Magazine!. One thing I wasn't told until after I routed everything is that the vacuum ports on the front of my TBI were disabled as a result of the boring over. I have a 1989 chevy 350 tbi that will not start when hot. Ultimate TBI, Part 2 It doesnt have to be super tough as it is on a reletively cool part of the throttle body and is not subject to manifold vacuum or being. Find many great new & used options and get the best deals for Granville-Phillips 350 Vacuum Gauge Controller 20350050 *VERY NICE* at the best online prices at eBay!. 1990 Chevy 350 Tbi Vacuum Line Diagram. Trying to diagnose so I can get my truck running right. "Left Manifold Vacuum" goes to a T. I know the fuel pressure is supposed to be 9-13 PSI on these systems. For GM TBI systems, please refer to my GM TBI Swap page. Mileage down from 13avg to around 8. Thoughts on holleys new 2 bbl sniper TBI anyone? Page 3 of 3 [ 37 posts ] Go to page Previous 1 2 3 Previous topic | Next topic : Author Message; OGLeanDart270. Browse basic chevy 350 vacuum diagram pictures, photos, images, GIFs, and videos on Photobucket. Read all about this Chevy 350 small block as we convert it to a throttle body injection from a carburetor. 0 COMMANDER 950 SYSTEM INSTALLATION. An engine's vacuum readings can tell an awful lot about its running parameters, provided you know how to read the gauge in the first place. Just installed a rebuilt 350 and when i put on the brake kind of hard it dies and lacks get up and go. Designed for swapping Vortec heads onto TBI engines and is EGR compatible. Vacuum/boost gauges are cheap and easy to come by. First, you need to know the vacuum. Engine Vacuum Test. There has been a lot of discussion of 454 distributor advance and modification. This was from a tbi 1991 k5 blazer, part number written on back part was removed recently from a running driving blazer and was working great. There's information showing the largest GM TBI comes off the 454 engines prior to 1994, so 1993 or older is suppose to have dual 2" butterflies rated at 645 cfm. The way I've always understood to check for vacuum leak due to bad intake gaskets (thanks to CDAUSA) is to remove the PCV and breather hoses from the valve covers, plug the holes in both valve covers, then remove the dipstick and see if the dipstick tube has vacuum. Dimension of attachment is 1/8" NPT. It then converts that measurement to 1 mV dc per unit. When setting timing on a Chevy 350 engine with a vacuum gauge are you suppose 2 disconnect the vacuum advance? Before anybody gets started on using a timing light let me go ahead and say this. I plan on rebuilding my TBI. Page 2 of 3: How to Test the Fuel Pump on GM TBI Fuel Systems. Anyone had any experience using a vacuum gauge on carbureted 454's? Thanks. For TBI engines or applications where the injector discharges above or before the throttle blade(s), the vacuum/boost port should be left disconnected and open to atmosphere, never blocked or plugged. TBI Fuel Injection Conversion using a GM TBI EFI system! One of the most popular EFI conversions to older Chevy engines or any engine for that matter is the GM TBI system using the 1227747 ECM. Located in Taiwan, DHCL Group has over 30 years of experience designing and manufacturing oil-less maintenance-free air compressors, vacuum pumps, and related accessories - with specific expertise in developing pumps and aspirators for medical and healthcare applications. When you get to the map port just move map to a different port on the throttle body. Will I have to get an aftermarket intake specific to this engine? I plan on using my Edelbrock 1406. The idle is rough, and I still get a code 33. check came back with all 8 around 150psi, can't seem to locate any real vacuum leaks, although there may be a slight leak around the throttle shaft where it goes through the side of the unit/ TBI base gasket replaced, no fix there. Trying to diagnose so I can get my truck running right. 350 small block, Holley carb: 4 barrel, double pump. Page 1 of 2: Diagnosing a Stuck Open EGR Valve (GM 4. It runs awful until up to operating temp and still lacks power then. One branch runs to the EGR control valve, the other branch runs to the air control valve for the smog pump. The key is understanding what your gauge is trying to tell you. A new gasket, a couple of fuel line o-rings, and a new TBI/air cleaner adhesive foam gasket (total parts cost $8. INSTALLATION OF PRODUCTION GM AND 670 CFM 2 BARREL THROTTLE BODY FUEL INJECTION KITS ON FORMERLY CARBURETED ENGINES. That is a place that will have vacuum on it when the engine is running at an idle. This page is for information about GM Tuned Port Injection EFI swaps. Computer isn’t compensating for the amount of fuel in the mixture. I have checked the pickup coil, it is 834 ohms. 7 Idle surging,stalling in the alt. it idles great but if i put it in any gear except neutral and pa…. After that if that fixes the brake problem then find a vacuum source that is full vacuum at idle off the carb. I have replaced the fuel filter, oxygen sensor, air filter, it doesn't matter which tank I run it on, I've used fuel dryer (Heat) changed pvc valve, could be a injector going bad?. Thanks Brad. clogged or damaged fuel filter Leaking injector(s). INFICON Vacuum Gauges with EtherCAT ® interface are compliant to the EtherCAT specification of the EtherCAT technology Group (ETG) and the EtherCAT Semicondurctor Device Profile. The 350 will make more vacuum at cruise than the 305, but that will decrease the pumping losses on the 305. It also has a pressure limit of 20’Hg-15 psi. One thing I wasn't told until after I routed everything is that the vacuum ports on the front of my TBI were disabled as a result of the boring over. Vacuum Gauges are of following types:- U Tube Manometer: – This is the most basic vacuum gauge where height of liquid column of mercury is used to measure vacuum. DO NOT USE the port in the back of the TBI unit for the MAP vacuum any longer, the best location is in the front of the unit or from a separate manifold vacuum source. I have a Chevy K1500 sierra with a 350 that is not EFI.