Chevy tbi one injector not firing. Got good spark at the plugs.

Chevy tbi one injector not firing Injectors click with 9v test battery. With its well documented project builds, technical articles, factory specifications, photo gallery, classifieds, active message forum, product reviews and original automotive content it's an unbeatable source. - Checked all fuses. fuel filter. Jun 11, 2019 · 1995 S10 4. One injector feeds the 2 end cylinders on its side and the 2 middle ones on the opposite side. 3 TBI; Conclusion A failed TPS (Throttle Position sensor), or ground wire to it, can put the system in the clear flood mode, making it so the injectors will not spray fuel. 1993 chevy truck: fuel injectors. The computer needs to receive a distributor reference pulse from the distributor module to trigger the injectors. My problem: the injectors are not firing when turning over the motor. 350 tbi, 700r4, stock stuff. Jul 21, 2024 · On the other hand, the 350 Vortec has a different fuel system. 7 EFI Injectors not firing - 1995 Mercruiser MCM 5. If your check engine light is on you more than likely have a hard fault meaning something is grounded out, unplugged, operating out of range or has gone bad. 09-21-11 06:09 PM - Post# 2139539 In response to dollarbill425 Found the problem, it appears that the wires from the ignition module to the coil was partly to blame. One wire to your injector should be pink this is the power wire it should have around 11. Try unplugging the TPS and see if the injectors spray fuel. Here, the throttle body is placed after the fuel injectors, changing the way fuel enters the engine. Most of the problems encountered while installing your fuel injection system or after a time of operation are very simple. Apr 17, 2017 · Therefore, if you have a dead injector, one of the first things to check would be voltage at the injector terminal. Fuel injection specialist. Will start and run for a few seconds if fuel is sprayed in the throttle. 5-12 volts with the key on. Dec 13, 2020 · Injectors are not pulsing, thus engine is not getting fuel. 1994 Chevy s10 4. With the engine running, check the injector voltage at several places between the ECM and the injector. They can (and do) fail in a way that you can still have spark, but no signal to the PCM to ground the injectors. May 27, 2003 · CK5 has since expanded to include the classic C/K series GM Truck and Suburban as well as past and present GM models. i put gas Michael 21 years Foriegn and Domestic driveability diagnosis and repair. Injectors are not getting any commands from the computer. Also make sure there's about 20 Ohms of resistance across the unplugged injector. Suddenly coughed and died. Test the injector resistance. Still no start. May 10, 2021 · I went through and made sure all plugs and connections were solid, and with the key on i tested injector plugs with a noid light, nothing. I cranked while watching the voltage on the injectors and it does fluctuate when cranking. Feb 18, 2022 · Thought that maybe the carb cleaner caused an issue with the TBI, so rebuilt it with new gaskets, injectors, new idle control valve, MAP sensor, and EGR. 90 suburban 350 tbi. This design helps mix the air and fuel better, which can give your car more power and make it run more efficiently. But from what I understand the testors only test the ignition side, not the reference side. I have replaced tps, no pulse. Make sure it's seeing at least 9 Volts at the injector on the injector side of the plug, not the wire side. With 12V already applied to one of the injector pins, grounding the other wire completes the circuit and the injector opens. The truck will not start. Two other things work with firing injectors . I can swap the connectors from each injector and the same one fires so i know the wiring is good. The first thing I would do is pull the fuel pump fuse so you can troubleshoot without filling the engine full of fuel. Actually this system is designed to fire the injectors synchronously meaning, the ECM fires one then the other as the engine turns. I then tested the A terminal of the injectors with my klein multi meter, i have battery voltage to the injectors, the computer is not telling them to fire as the computer switches to ground and ultimately Engine Performance problem 1987 Chevy Truck 6 cyl Four Wheel Drive Manual I have a 1987 chevy truck throttle body injected 4x4 manual. Username Post: 90's TBI 350 Chevy v8 injectors won't spray (Topic#326727); maherc84 Forum Newbie Posts: 1 Reg: 07-18-15 The green and blue are connected to the PCM. Between 11 and 24 to be exact. - Fresh fuel both tanks. Make sure you did not miss something a wire loose connection when you put all back. Gas is present to the tbi unit while cranking. and one on intake behind where ac pump is or should be. . I have replaced map It means either the fuel Injectors are not firing when cranking or the fuel pump is not putting fuel pressure to the throttle body. Fuel is getting to TBI. Fuel pressure is good, when I ground each injector I get a good cone of fuel spray. I pulled the module and put a different one in. Nov 1, 2013 · Just a hauler and tooling around vehicle occasionally. Make sure clean and connected tight. Removed engine, all components and reinstalled on new reman block. Oct 3, 2023 · Hello all, Recently bought a 91 crewcab square with a 454 TBI with a 4l80e behind it, after vehicle has been shut off, after more then 30 seconds it won't restart, found injectors to not be pulsing on startup/spraying fuel. Injectors are not pulsing. Hasn't started since. Feb 17, 2000 · This isn't really a K5 question, problem is occurring on a friend's 94 pickup. I have the block grounded very well to the battery -. Only one of the injectors are firing. If more than one injector is getting low voltage, the fault may be a bad injector power supply relay. Can't get the injectors to pulse when cranking. Got good spark at the plugs. Apr 14, 2010 · I founfd a rogue plain purple wire running to the cab it was crimped to the toyota circuit but looks like it fell out i cant find a corresponding wire for it though. 7 Alpha EFI TBI S/N 0F357172 Customer brought boat to me and had been sitting for 2 years without being winterized. Oct 31, 2017 · It sounds like your injectors are not firing which could be a crank signal problem or wiring,distributor pickup coil problem or a computer problem. If it’s less than battery voltage, there may be high resistance in the connector or wiring harness. The blazer ran fine before the swap. as well as the Mar 12, 2012 · Okay ecm fires injectors with groundshould have a set of ground wires at thermostat. I have replaced ecm, no pulse. Jul 14, 2018 · If the engine will run with a fuel source other that the TBI injectors, then the pick-up coil and control module must be working, which create the signal to the ECM to fire the injectors, or the spark plugs would not be firing at all. I am going to get both modules tested. It should blink while cranking, if so the computer is pulsing them. Reassembled, tried to start it out of the boat, but Oct 15, 2015 · Ok. The PCM grounds each wire when it fires the injector. Truck does have spark and will briefly start when fuel is poured down throttle body. On a TBI, most common reason for no fuel spray from the injectors - although there is proper fuel pressure - is a bad ignition module. The injectors are still not firing, but the node light test shows the harnesses flashing. TBI injector resistance: At an ambient temperature of 20c the resistance of a TBI injector should be 1-2 ohms. I have checked with a noid light, no pulse. 3 Ohms If the resistance is OK, you should check to see if there is power to the injectors during the no start condition. Injectors are not "buzzing" when cranking. I have unplugged tps to see if in flood mode, no pulse. The injectors are not firing. then the battery to the body. Any insight into the most plausible issue would be helpful. Aug 12, 2022 · Yes, the ECM grounds the corresponding injector when it sees a DRP so the injectors are pulsing. fuel pump. The TBI is a 7747 ECU system off of a '91 G20 van. I have replaced pickup coil in distributor, no pulse. Hook a regular 12v test light in place of the injectors. Easy to crack a line at the fuel filter or throttle body to see if you are getting fuel. Here‘s what I’ve diagnosed so far: - Battery fresh off charger. 3 tbi setup from a 1988 S10 blazer I used as a donor for my camaro I made body mounts for the camaro and put the camaro shell right up on the blazer chassis. Test light shows voltage at injectors during cranking. Nov 9, 2021 · General Q & A - Mercruiser 5. 4. - Verified both pumps will run and build pressure at relay test port (both sending Jun 7, 2017 · If it's firing plugs the pickup should be good. Jun 14, 2012 · Did you check the fuel pressure? How bout the little filter on the injector? Frayed wire to the injector? They're pretty simple systems once you play with them. 3 how do I check the fuel injectors twin spider injectors HDGENE ASE Master 34 years experience, Ford Trans Tech/SMT, Toyota, Mitsubishi,Hyundai Tech. I again put 12V/2 Amp jumper lines to the injectors and the one injector sprayed perfectly and the other not quite as well. The injectors do not fire although I can start the engine on gasoline added through the tbi (so I have spark). pickup coil. A typically reading would be 1. 3 TBI Vin Z. ASE Cert. If the computer is pulsing them and there is fuel at the TBI unit, the injectors are probably stuck like someone posted above. It is an older GM module, I think the original one to the truck so it may or may not be good. Engines with Similar Firing Orders. Any advice is appreciated! Oct 3, 2011 · Because they did not spray properly we agreed to replace the fuel pump (the complete package w/ sending unit) and the fuel filter. Pour gas into the tbi and it will run until that gas burns off. 2 to 1. My problems started when a wire got pinched in between the throttle body and the plastic spacer ( blowing ecm 1 fuse) and im assuming it shorted out the injector . I swapped the tbi unit and finally got injector spray then lost it then got it again basically the terminals on the pigtails going into the ignition module were a bit loose connecting to the pins I squeezed them and replaced the Jul 19, 2008 · Junkyard TBI install question - Injectors Fire Now! Been working on my junkyard tbi install and got it to the point today where I could fire it up. and ignition module. I have 30psi at the fuel inlet when cranking. Mar 7, 2011 · I have a 4. jym brxag jofao dbvmg oggun pxcqc fzcdbafxc pbpth aljkl cmkt