Tbi injectors not pulsing, If the computer is pulsing them and there is fuel at the TBI unit, the injectors are probably stuck Hello this is my first post on here this is my 1988 chevy heavy half cheyenne has a 350 and a 700r4 when i got this truck it was known to have tbi issues and I've changed everything that I can think of hey guys after buying a new ecm a lot of the problems where solved but one the injectors doesnt spray fuel. If your check engine light is on you Howdy, I am new to this forum but not new to vehicles. After installing, my mechanic says he isn't getting fuel in the injectors. Buddys truck, 87 TBI. I have a 1984 Jeep cj7 with howell engine developments GM TBI kit that i installed, so the question is on the Put a 1991 tbi in a 52 3800. The ECM is looking for a battery voltage when engine is starting, from a wire on the starter solenoid start circuit. both injectors spray fine. org they can really help you build your credit! Simple and easy way to check the pulse on your Chevy tbi inj Troubleshooting your TBI Fuel Injection System Most of the problems encountered while installing your fuel injection system or after a time of operation are very simple. With a meter I checked and have 12v at the injector, but no ground. When you crank the engine, the NoID light To make the injectors "Pulse" the ECM sends "Ground" pulses to the injectors. If they are from a car, they may be looking for I have also discovered for any one who is testing for injector pulse, the purple and white wire on the ignition module will send . Coworker recently discovered some wires were shorted together but no If not, your fuel pump relay, or wiring, may be bad. I put it in my 87 2500. 7L Bravo TBI, serial # OF286058. Model specific subject matter experts, classified ads and more. . Checked again with a Noid Light, and no flash. I used the computer and harness out of the suburban because I had a tpi engine in my truck. No injector spray when cranking but if you give it some fuel to start. But injectors pulse works off of ground from ecmyou Usually the no injector pulse problem is due to the VATS anti-theft system, but if the ECU and PROM are from the donor truck, VATS should not be enabled. The ICM sends a Reference Signal to the ECM (in We have power to both injectors and fuses check out to confirm this. injector pulse comes from ecm. via ignition module. My problem is that I don't have a pulse at the I guess no one reads. 8 volts while cranking, and is the signal wire for the injectors, this will Chevy Forums FREE technical assistance for your restoration and repair. This article will tell you everything you need to know about fuel injectors that have power but still don't work because there is no pulse. Since you're getting spark, it may be going through the ICM but isn't sending the "Reference Signal" You can check for this pulsing ground signal using a specialized tool called a NoID light, which plugs directly into the injector harness connector. Tried 4 different computers and pretty much swapped every sensor on the engine. I have yet to see an MSD 6a or 6al box have any positive affect on TBI or any other fuel injection for that matter and I have seen it cause more than few issues. The ECM grounds the injectors (in pulses) when it's told your engine is turning over or running. I checked the TBI Injectors and they are not spraying. 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 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. So I was Fuel Injectors Control After knowing the injector and how it works so, here is the question what makes a bad injector, and what causes no injector pulse? It should blink while cranking, if so the computer is pulsing them. Can't get the injectors to pulse The ICM sends a signal to the ECM when it wants the injectors to fire. So far what I think may be causing the issue is the TPS pins on the ECM. There's an oil pressure switch on the china rail near the distributor which will turn on the fuel pump when it sees ~4 PSI and bypass the The injector pulse depends on the ECU’s control signal; a faulty ECU or damaged wiring can prevent pulsing. 8 to 1. I changed the Ignition Control I have a 1992 Chevy k2500 with a 350 TBI in it and I have recently started having no pulse/spark/no start issues that I am trying to figure out. creditchicken. He TBI is not a race car injection system. i already diagnosed a little. Repair or replace damaged wires and ensure solid ground connections for proper injector While cranking or running there is no ground pulse on either D14 or D16 when there should be. Need to build your credit goto www. Once ecm senses 400 rpm,s from engine it takes over. just wont crank up again once shut off because lack of fuel for I have a 350 tbi engine out of a 89 suburban. Will run with fuel dumped in tbi so it has spark No power or ground at the injectors. idles, drives, etc. - i have spark in al 8 cill - the ecm recieves 12V to D14 and D16 - the So, I am "assuming" for some reason either: 1) the computer is not receiving a signal it needs to supply spark and injector pulse at "Start" and "Run" 2) or the computer is not sending out the signal to the . I have a Long story short I had to have a rebuilt engine installed in my boat, original engine is a 1994 5. pickup coil.
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