Tbi injector not spraying

Tbi injector not spraying

Tbi injector not spraying. Let engine run a minute or so, not enough to completely warm up. May 11, 2021 · 10. I recall that I also had a Knock sensor issue that they helped diagnose & get rid of. Injectors are spraying good patterns, I have looked a that on youtube. See this link for how to test , the ignition module controls your injector pulse. Yes it is a nice spray pattern coming out of the injectors like full throttle, engine not running just the key in the on position. However, they also gum up, and that affectls the spray pattern. You can access fuel flow spray with ease, making it fast to do fuel injector testing for potential issues. This can be done with 12volt test light with key on engine off. - Answered by a verified Chevy Mechanic Aug 9, 2014 · Before I rebuilt the TBI, I had to crank it longer than normal when cold, and the throttle was sluggish from idle. b. The fuel pump comes on for about 2 seconds and then shuts off when attempting to start. --injectors have been replaced, they pulse during ignitionwhen started, injectors spray constant, dumping fuel. Model specific subject matter experts, classified ads and more. Ran smoothly then stopped running just like you turned off the key. Serving our valued customers for over 40 years. If power present, use noid light or test light and check for injector pulse (flash) while cranking. So check the pressure and see what it is. #1 · Aug 16, 2009. Chevy Message Forum - Restoration and Repair Help. injectors spraying tbi View All » Question about 1989 Chevrolet Suburban. please help I I just rebuilt pretty much the whole engine new crankshaft new camshaft new pistons and rods new lifters, new pushrods. The injector pins were completely isolated to to ground when on megohm scale. thinking the pump or filter was bad again. This step tests for 12 volts to the injector. Might be to your advantage to rebuild the hole thing. If injector test light blinks, the ECM and wiring are OK. If none,check the fuses . then shuts down. Nope, sorry to say its a design flaw in the TBI engines. TBI system, injectors will not spray fuel into the system. My 1989 firebird 305 TBI isn't spraying fuel from throttle body injectors. Complaint – TBI Injectors won’t pulse fuel when cranking the engine, then after spraying either into the throttle body it will start and the TBI injectors spray fuel but the engine will surge from about 800 RPM Check for voltage at the connector to the TBI injector. Mar 23, 2018 · TBI not spraying. Engine would turn over but no fuel spray from injectors. It’s a new Howell TBI conversion on a rebuilt 258. Each time you touch the jumper to the battery, the module will think it saw a pickup coil pulse. The old PCU driver that was shorted was on the 0. Check to make sure the fuel pump is running. The power side of both injectors shows 12V. and complete tune up on the truck, it still Nov 1, 2013 · I put a test light on the wire with my Dad cranking the truck and the test light flashed consistently. Painted or polished (stainless) new filters, o-rings installed and final test. With engine "off" and ignition "on", check for fuel leaks. There is spark as the engine will briefly fire with starting fluid. Michigan. If they do, you probably rolled an o-ring when you installed them. 4) We replaced in-tank fuel pump and injector bodies. #1 · Sep 26, 2018. You can visually inspect the fuel spray on TBI system injectors. 454, STOCK engine approx. Jul 7, 2020 · 28. Location. No fuel spray from injector. … read more DCM Oct 31, 2023 · No matter the style of fuel injection, the same 10 most common problems can plague each system, but we have the simple answers to fix them. Injectors not spraying, noid light not lighting when I try to crank. Each bath has different chemicals for different types of deposit removal. 1989 Suburban 1500, 2 WD, 350 w/TBI, 187000 mi. Have spark. This allows heavy particles to hold a constant spray pattern and a delivery Feb 6, 2021 · Answered in 6 minutes by: Chevy Mechanic: Nachum Wagschal. #2. 7L TBI V8, TH350, ARB's F&R, Orion, Work in progress. Reconnect electrical connectors to fuel injectors. The injectors should not spray fuel. The truck starts and runs as long as you spray starting fluid into the TBI. Feb 5, 2021 · Tbi injectors will not spray. I dont know why the one injector Apr 27, 2007 · Looks like one of my TBI injectors is not spraying very well. you need to double check for fault codes, get a good battery in the truck and retest the circuits or have a shop double check them before doing any major repairs. I am building a truck for my daughter I took a 1984 s10 4x4 and swapped in a 5. 5. I check fuel Jun 17, 2019 · My 1982 CORVETTE TBI Injection is spraying solid fuel and flooding. you have no supply for it to spray. 3l v6 t. Started up fine, ran a few minutes and died. I'm getting gas thru the line to where it connects to the TBI. If it initially runs for a few seconds then shuts off then there are two common problems. 6) If I remove the pressure regulator assembly and turn the key to START, fuel sprays out of the Mar 15, 2015 · If no spray is achieved, replace the injector and check the running condition of the engine. Turn key on but do not crank engine. both injectors spray fine. I am haveing problems with it going in and out of open loop mode after it has warmed up, and it then runs rich. If you have voltage but still no spray, make sure the injector is not clogged. Reply 1: Good morning. Mar 25, 2011 · The vehicle is a 91 ram van with a 360 cu motor. I've got an 89 Comanche that will not start. Jan 23, 2013 · SOURCE: 90 chevy k1500 350 tbi fuel problem starts but wont stay running try bypassing the oil pressure switch on the back of the block behind the distributor, if there oil pressure switch goes bad it will do this. How do you, or can you, take the injector out to inspect what is causing the bad spray pattern. Mar 21, 2010 · Throttle Body Injection Unit Fuel Injector Parts The fuel injectors are solenoid activated, controlled by the control module. but the . On 1st cold start, injectors give the correct little spray to help start engine. With tbi fuel injection, the fuel pressure is 9--13 psi. ) Maybe the hose that connects the fuel pump to the sending unit inside the tank split or blew off. The TBI's injectors aren't really injectors at all. I pull over, pop the hood and pull the air cleaner off. When I bought it but the motor was horrible so my cousin gave me his 89 s10/blazer with a t. ) Plugged fuel line, filter, or injector screens (as @RayVoy suggested). Use a 12 volt test lamp & check for battery voltage (with key on) at one of the terminals. However is letting us use his shop to Jul 8, 2015 · 1992 c1500 5. My 1980 FJ40 Build My first 40. Each rebuilt TBI assembly includes Injectors, TPS, Idle Air Valve, and Bushed Throttle Body Housing. Feb 12, 2015 · It shouldn't come from anywhere no matter the fuel pressure. Good Afternoon , You need to check if you are getting a signal to the injectors to spray . (Electrical terminals of the injector should be parallel with throttle shaft). First is the fuel pump itself. Chevy Forums FREE technical assistance for your restoration and repair. 7L. Jul 8, 2022 · After driving 84 to neighbors, it would not start to come home. I believe it is the ECM B fuse. 36 ohms. I have a good spark (after finding a week coil and replacing). I. Engine Size. Engine idles rough. First I start with a new Fuel pump, STOCK 75lph TBI fuel pump will only support about 230hp before the fuel pressure drops like a rock. I have a 1990 chevy I can look at for reference and i can pretty much Jul 29, 2006 · pepe Discussion starter. Nov 8, 2014 · Checked the injector resistances and they are 0 . Nov 21, 2006 · curtis73. Jun 5, 2022 · So I tried to crank it up again after a couple of months (life got in the way) the truck would not run. Will not start. Install fuel meter cover. - Fresh fuel both tanks. Testing TBI Injectors By Inspecting the Fuel Spray. It has TBI system. I don't hear any click. Shut engine off. Try running some Fuel Injector Cleaner through a couple tanks of fuel to see if it gets them cleaned up. One or More Injectors are not Clicking Unplug the fuel injector connector. Then subtract that from the readings from the injectors. 7 tbi 4x4 it sat for two years. Jul 6, 2014 · C10. It started 4 nights ago, I was driving home from the lake and I got a mike from my house and my truck shuts off while driving down the road at 45. Basically I have a 1992 Silverado tbi 350. #1 · Jul 21, 2011. 7L Bravo TBI, serial # OF286058. Long story short I had to have a rebuilt engine installed in my boat, original engine is a 1994 5. Last edited: Jul 11, 2018. ©2003-2006 InteractivePHP, Inc. Cycle the key. Test TBI Injectors. I replaced the distributor with a new rebuilt AC Delco from rock auto today. We have done a number of TBI and there are always compromises that were not anticipated, usually due to RECOMMENDED 350 TBI MODS. i tried to start it. Rebuilt customer TBI's are Quickly Turned Around in our Largo, Florida factory and ready for Quick Delivery. Had cross fire (wires to manifold) and drove it for a week or so. The forum is now closed for maintenance. FusionBB Version 2. Complaint – TBI Injectors won’t pulse fuel when cranking the engine, then after spraying either into the Nov 28, 2022 · TLDR: new injectors cause engine to hunt/surge at idle when warm, runs as it should until coolant temp gets to 150f. 7L engine 4-speed auto. checked all the fuses all good. 91 CHevy 1500 P/U, I can not get the TBI injectors to spray fuel. If I manually pour fuel into the engine it will run but only until it is all burnt off. it starts up runs for 30 sec. I have seen fuel injector spray pattern that looked good to me, but, the fuel pressure was half of what it should have been. You should see a pulse or voltage when the vehicle is running. i put a new fuel pump filter. Dec 14, 2023. What do I need to do? Hey all, I have a 1987 Silverado R10, after doing an engine swap, had the original distributor in last week and the tbi was spraying, but put an HEI distributor in and now it’s not spraying fuel. Put a 1991 tbi in a 52 3800. The circuit has constant voltage to the injectors when key is in on. As below, change the ECT sensor first or check that Diagnosing TBI (Throttle Body Injection) injector spray issues during the crank phase in Chevy models requires an in-depth understanding of the fuel system’s intricacies. you should have the voltage go up and down. It started and ran very rough and then wouldn't - Answered by a verified Chevy Mechanic Mar 8, 2004 · Re: TBI won\'t spray fuel. 93 TBI not spraying fuel during crank. Jan 22, 2018 · I’ll take from the hip versus no shots fired at all lol The electrical tape on the fuel injector wiring is my doing, because there was no insulation on the wires within the Throttle Body. Nov 9, 2021 · 1995 Mercruiser MCM 5. So the issue is it has no TBI inj ground pulse during crank if I dump fuel down the TBI unit it will start and run as long as I don't shut it off. checked pulse with noid lite also checked all wire for ICM and Aug 16, 2009 · 680 posts · Joined 2005. had one that drove me nuts trying to fix it then figured out I had to buy a book and low and behold thee it was 3 wire oil pressure switch you can't see between the engine and fire Jul 30, 2010 · If you have a Digital volt meter, unplug the injectors, and do an ohm test, they should be very low at 1. It does prime when you turn the ignition on. 6. Ive been having an issue recently, and very randomly. i had a tune up a new fuel tank line pump and filter put on before it sat. Jul 11, 2018 · Need to find out if there is any fuel getting up to the TBI at all. Plug the correct "noid" light directly into the injector harness connector. you should get a power on one side and a pulsing ground on the other wire. 5) At best, injectors drip fuel, at worst, nothing comes out. . 7039 posts · Joined 2005. ==sheriff==. Sep 25, 2010 · Buddys truck, 87 TBI. 3) The injectors do not spray fuel. So I begin every project with a new upgraded Jul 12, 2015 · So i switched out the fuel pressure regulator and made it worse now it wont start the injectors spray of pattern and left ones not really spraying i switched the Dec 8, 2010 · Absolutely every single engine issue I have had since I owned this truck was caused by a faulty fuel injector. He pretty much said that after 10 hours of trying to diagnose it, he's done. #1. Fuel, under pressure, is injected in a conical spray pattern at the walls of the throttle body bore above the throttle valve. I swapped a TBI unit on my SBC 350 in a 90 Jeep Wrangler. 1989 GMC vandura 2500 5. Inspecting the fuel spray on TBI injectors is easily checked visually and it is the first method of how to test fuel injectors. An injector should spray and the pump will run for a few seconds. If the pressure isn't significant to pressurize the injectors, they will not allow fuel through. Dec 6, 2011 · 1989 s10 4. 4. Jul 21, 2011 · 10 posts · Joined 2011. have fuel comming to throttle,injectors not spraying. They can wear out the solenoid can become sluggish, and finally give up the ghost. 0/4L80E. 1 more comment. Jan 2, 2014 · Its been so long now, I don't recall exactly what was the issue. I have a scanner and have looked at all of the Oct 31, 2017 · Use a gage and check proper fuel pressure. com specializes in rebuilding (OEM) original equipment TBI assemblies. 1988 S-10. With new injector filters and O-rings and new fpr diafram and spring. No - Remove one of the injector connectors from an injector. Does the injector spray fuel when cranking the engine? Yes – Go to step 2. #1 · Jan 13, 2009. 2. Apr 26, 2019 · i have a 1990 gmc jimmy. Your fuel injectors have tiny orifices in them to atomize the liquid fuel and make it spray a fine mist. **NO engine codes, only code 12. and fuel is pumping out of the lines going to the throttle body. is not working. should be posted up somewhere on this site. Will run with fuel dumped in tbi so it has spark. engine cranks,have spark,fuel pump works,no fuel out tbi injectors. The tps works as expected. Apr 1, 2022 · You don't have spray from the fuel injectors if the pump. This short video shows the proper spray pattern of GM throttle body fuel injectors. This particul Aug 14, 2023 · Re: Building a custom TBI throttle body or other injection setup. The van starts but floods out, throttle body fills up with gas. I did check the voltage to the injectors 12V positive wires while cranking and there was about 10 volts. Probe the two terminals of a fuel injector to check its resistance. Replaced plug wires, plugs, cap, rotary button. It doesn’t take much to clog an injector. fix that first and then worry about timing. Hello, my '87 Cutlass OBD1 with TBI fails the emissions test because of a rich code #45 at idle. I pulled the ECM and checked the 2 grounds, or at least what I felt were the grounds with the ECM unplugged. These issues lead me to believe it must be a signal issue? Maybe the ECM isn't getting the right signals from something? I have little to no experience with TBI. #1 – Your Fuel Injectors Are Clogged. Feb 28, 2010 · Unplug the tbi injector harness and plug the multimeter in to the harness and have somebody crank the engine. May 21, 2010 · What causes fuel injectors to stop spraying when intermintently cut out/ - Answered by a verified Chevy Mechanic Apr 14, 2014 · 89 V2500 Burb TBI 350 crate motor. Jan 13, 2009 · 15 posts · Joined 2008. 135K miles. Here‘s what I’ve diagnosed so far: - Battery fresh off charger. Aug 2, 2015 · 14,590. If you hear the pump running when cranking there's other things to check. , injectors throw out easy too much fuel. I will get the noid ligts and see what that tells me. Here is the troubleshooting we've done so far (I am not a mechanic, so please excuse any incorrect names for things): So I think my next step here is to figure out why the voltage going to the injector harnesses is low. Will run on starter fluid. 1. #2 · Jul 29, 2008. My 88 s10 had a 2. 155. The problem is the injector spray. Feb 10, 2011 · ck35004dr said: i have a 1989 chevy 2500 silerado 5. After installing, my mechanic says he isn't getting fuel in the injectors. Any applicable trouble codes? Mar 25, 2017 · I recently have been trying to switch away from a Microsquirt ECU on a 383 TBI, putting the old 7427 PCM back in and acquired all the chip burning hardware. 5 psi may show a good spray pattern, but, it won't start and run a v8. Spray it out and try again, before replacing the injector. Van Won't Start/run 1995 G20 Chevy Feb 25, 2012 · 2) If I put gasoline into the throttle, the engine does start, and dies when the gas burns off. The ecm grounds the circuit internally, energizing the injector solenoid when it wants pulse. I tested them with a test light and they lit up. I again put 12V/2 Amp jumper lines to the injectors and the one injector sprayed perfectly and the other not quite as well. You should also check to see if the ECMB1/ATO fuse is burned out. Retest and repeat if needed. The injectors have no voltage during crank and Aug 12, 2022 · The other injector feeds the other cylinders, obviously, ha ha. Can you test the pressure? TBI should be around 14 Oct 3, 2011 · The injectors are still not firing, but the node light test shows the harnesses flashing. Compared to the other one which spray a nice even mist, the other one seems to have more of a heavy droplet spray. 7. idles, drives, etc. Holley Dominator EFI with large amounts of dry nitrous. First off this is a stock 91' GMC TBI 350 out of a 1/2 ton 4x4 Suburban that is currently is in my Jeep CJ 7. Any help? Dec 7, 2007 · Fuel injectors not spraying on a tbi system 89 chevy truck fuel pump pressor good ecm good fuel filter good wont start - Answered by a verified Auto Mechanic Mar 31, 2007 · The hoses on top the pump are fuel, return and vent. The stalling when cold: fuel injector not pumping enough fuel. Hear loud clicking noises from engine area and injectors pour tons of raw fuel out, fills up the throttle body to the top Jan 14, 2011 · 1988 S10 2. If there is, then the ECM is not getting the signal to fire the injectors from the pick-up and control module. fuel is getting to injectors but driver side is dripping not spraying, and the other one doesnt seem to spay at all. do a search. 5 TBI, 5 speed. Posts. #1 · Jul 29, 2006. In my experience unless you have a fairly low performing engine that matches a stock TBI setup of some kind, the carb will be better. there is a certain procedure to set and check timing on a tbi truck. No fuel can be seen spraying from the injectors (Throttle Body Injection). Jun 26, 2018 · 1990 1 ton 4x4. 1989 CHEVROLET SUBURBAN. 2 ohms each. I know its a long shot, but we need to eliminate bad injector windings. Ask Your Own Chevy Question. I remote start my truck to watch the engine and the injectors are not spraying fuel. Sep 26, 2018 · abig84 Discussion starter. the fuel injectors have power. It's all controlled by the ECM. Notice that no droplets form on the nozzle of the injector. If it's coming from somewhere on the throttle body then a gasket has failed or somehow the housing cracked. just put a new distributor and ICM. Can anyone download a vid. There are only two ways to stop fuel from coming out of an injector. just wont crank up again once shut off because lack of fuel for start:confused: Sep 17, 2014 · If you are getting a lot of gas odors, it could be a leaking injector, but that would not necessarily show up in the spray pattern. Ive got a 1988 k1500 with tbi and the left injector isnt spraying enough fuel and the right injector is spraying to much fuel what could cause this? Also what should the fuel pressure be at the fu Feb 24, 2010 · Verified. Posted by Christian Givans on Aug 25, 2013. Jul 6, 2020. 7 from a 1988 c1500. Feb 12, 2015 · 88 chevy 350 tbi right injector spraying to much fuel left not enough 2 Answers. 7 Tbi no injector pulse while cranking. 187,000 MILES. 8 v6 t. One is an oil pressure sensor and the other is the computer isn't getting a signal from the distributor saying the motor is turning. I recommend upgrading to the 1996 Vortec 155lph fuel pump which can support up to 450hp and plugs right into a factory TBI sending unit. It should flash when the injector is activated. 7 Alpha EFI TBI S/N 0F357172. I am going to check fuel pressure just to rule out the pump. I reached out to Howell Fuel Injection and got a new ECM. The spray is pulsed, and you can check the pulsing with a noid (light used to check a solenoid) light. Steps to inspect fuel spray: Take the cover off the air cleaner housing; Ask someone to 88 chevy 350 tbi right injector spraying to much fuel left not enough 2 Answers. Cleaning in 3 ultrasonic tanks while being triggered at different RPM. The one marked p goes to the battery positive, n to negative. Jan 14, 2010 · So the last thing I can think of is the fuel injector is not spraying correctly. If it' spraying from the nozzle without the engine turning over then you need a new injector. 3 v6 with a blow head gasket. I have a 94 GMC K2500 that will not start. May be clogged. Hello, Go to the throttle body & disconnect one of the fuel injector harnesses. I purchased the ECM and wiring harness from Performance Fuel Injection Systems. If fuse is blown look closely at injectors wires going around top of throttle body for short. There is no provision to check the fuel pressure. Injectors are not pulsing, thus engine is not getting fuel. With a voltmeter or test light measure the voltage or validate power to the pink wire of the connector with the key on. 1 Answer . Ive got a 1988 k1500 with tbi and the left injector isnt spraying enough fuel and the right injector is spraying to much fuel what could cause this? Also what should the fuel pressure be at the fu Jun 16, 2012 · Verify power at injector connector red wire (s). Feb 18, 2022 · No spark and no fuel spray often means distributor problems--pickup coil, magnet, module, maybe wire harness between distributor and ECM. May 21, 2012 · Initial flow bench and spray pattern testing and observations. Mar 16, 2010 · Its not very hard to rebuild the TBI unit. Nov 20, 2021 · 87 Blazer TBI no injector pulse 1987 Chevy K5 Blazer, 5. i. I put new gaskets in the 4. The vehicle is old and worn, but didn't burn oil. Just won't run as there is no fuel pulsing out of the injectors. Secondly, it there is no pulse at the injectors they will never open and pass fuel. 2449 posts · Joined 2003. No power or ground at the injectors. If no pulse then suspect faulty ignition module, distributor pick-up, ecm or faulty wiring. On a side note, the ignition coil is making a weird buzzing sound for about 2 or 3 seconds when key is first turned on, like it's sparking constantly without the engine even cranking over. Unplug the electrical connectors to the injectors. Built for all out drag racing. No – There is no power getting to the Jun 15, 2012 · I replaced the injector that's not spraying and it is still not spraying, leading me to believe its just not being told to spray. of a correctly spraying injector from a metro? Also if it is clogged ( I have done the seafoam treatment twice, no improvement) can I replace just the injector or do I have to replace the entire TBI assembly? Mar 29, 2024 · 1. Restarted on first try and ran fine for days, a few days later did the same thing but took Dec 13, 2020 · Installed everything, finished today and tried to fire up, will just crank, no start. I'm not sure what to check, any help is appreciated. Before it died there was an issue with chugging, it would shake and buck and rattle the whole drivetrain real bad. The severe pinging: lean spray on that injector. Learn why fuel injectors fail to spray and how to troubleshoot the issue. Jun 3, 2014 · 6. Rebuilt engine has 25,000 mi. 4L 1992 GMC sierra 1ton. 48 and 0. Nov 25, 2020 · 1990 k1500 350 TBI no start, with spark but no fuel spray at TBI - help. 13 people found this helpful. 36 ohm injector. Fuel flow spray is readily accessible, making it fast to check for potential problems. After rebuilting the TBI, it would start right up and had great throttle response at all engine RPMs. NOTICE. #2 · Nov 21, 2006. This article delves into the common questions and solutions surrounding TBI not spraying fuel when cranking, outlining essential troubleshooting steps, and highlighting the Push down on injector until it is fully seated in the fuel meter body. My problem is. 3 plugs don't phase engine much when wires are pulled off one at a time. I've replaced a bunch of sensors and the computer, and tested the fuel pressure to the fuel regulator, and everything (to me) looks good except the TBI seems to be spraying too much fuel at idle. By touching and removing a test light, connected to 12 volts, to CKT 430, a reference pulse should be generated. In my opinion. With the MS (Microsquirt), I had it running and driving pretty good, but putting the original PCM back in (and changing the Displacement per cylinder to a 383 in the Binary file) it ran terrible and would not drive in gear. Yes – Pink wire has voltage, go to step 1a. Restarted a couple times and now nothing. Wondered if the exposed wiring was what caused the injectors keep spraying after the truck stalls, but made no difference. I have a brand new distributor/coil and all new sensors (ECT, MAP, TPS, O2, IAC). by Paul_VR6 » Thu Aug 17, 2023 1:25 pm. To check them measure the lead resistance of the DVM leads (short them together). Jun 7, 2017 · Unplug the pickup from the module, hook two jumper wires to the module terminals. Remove the cover of the air cleaner housing (where the air filter lives). Old injectors cause engine to run as it should when cold and warm. 3 while it was still in the blazer and it ran perfect after I fixed the head gasket issue. Sure this was due to it running lean (one injector was not spraying at idle). My 1990 K1500 350 TBI recently had a NO START condition with NO spark and NO fuel spray at TBI. If I'm not mistaken the computer gets the reference signal from the ignition to fire the injectors, I May 26, 2020 · TBI no injector pulse during start. 46 60ft. --Problems just started, i have to fully depress pedal to start. Nov 20, 2021 · 2 years 6 months ago #52694. Sold. 8. 14457 posts · Joined 2007. Install fuel meter cover gasket. It is just they are spraying like wide open all the time. Short drives diffusion. It starts when carb starter fluid is sprayed into the throttle body but then dies immediately after. The fuel pump went out and changed that out with a new one. The control module turns on the solenoids, which lifts a normally closed ball off a seat. Truck does have spark and will briefly start when fuel is poured down throttle body. Tried 4 different computers and pretty much swapped every sensor on the engine. He developed this problem where the injectors won't spray during cranking but if you get it to fire using starting fluid or drizzling fuel into the TB-- then it will fire and Jul 29, 2008 · 13181 posts · Joined 1999. I ran into a weird problem (to me). If they only squirt when plugged in, you need to figure out what is grounding them. squaredeal91. The hei is giving spark but idk why the tbi stopped spraying fuel. No injector spray when cranking but if you give it some fuel to start. My buddy has a 93 or 94 TBI on a 454 basically stock setup in a motor home. Still no fuel spraying into engine. Sep 9, 2014 · fuel pressure for an 88 tbi is 14 to 15 psi. ThrottleBodyInjection. Have you done a fuel filter. The most recent drivability issues were also from this fuel injector because it was near death and simply not pumping the injector filter basket and reduce the of this is short drive cycles. Aug 2, 2015. May 2, 2023 · Discover common culprits behind fuel injector malfunction. --NO o2 sensors on the manifold. 3L based 309 nitrous fed power house. 1987 Chevy K5 Blazer, 5. or use a test light on this one and watch for it to blink. and rebuilt the TBI new fuel pressure regulator, new injectors. 87 Blazer TBI no injector pulse was created by lzjr88. It has new fuel pump and new fuel filter. I have replaced the fuel pump, fuel filter, distributor, 2 new injectors, injector connectors, rebuilt the TBI, and replaced the fuel censor. When its running sometime look down the throats and you'll see it squirting wet fuel on the throttles. Hello, basically I have a 1992 Silverado tbi 350. There is fuel getting to the TBI. Your pump could be working but not have enough psi to operate the injection properly. I replaced the fuel filter and put some Sea Foam in the fuel Dec 31, 2016 · Jul 2014. 1. I have good fuel pressure (during the prime cycle I applied 12v and ground to the injector and got a good cone of fuel spray), so the injectors work too. montehammons Jul 08, 2015. 1995 G20 Chevy Van 350 K Tbi. Got this for my step son who is 1st year electrician apprentice. 1980 FJ40. The following is what I have tried: changed fuel filter, injector fuses - OK, continuity from injector to fuses-OK, 12V at injectors when Apr 1, 2010 · This test will determine if the ignition module is generating a reference pulse, if the wiring is at fault or if the ECM is at fault. A little help with my TBI. I noticed the drivers side injector was spraying/ spitting kinda sideways and noticed gas would hit the center part of tbi unit and then drip. they use low pressure and they are more like squirt nozzles from a spray bottle. Ask an assistant to start (or crank the engine if it doesn't start). first things first -- if only one injector is working you will be waay down on power. checked the fuel lines all good. dj uk ec ft zc ss rg if lc px