awhile shuts fire and feul pressure have rebuilt distributor

After it runs for a short period, the system shuts off, and there is no injector pulse, although there is spark and fuel pressure. The distributor has been rebuilt, and the EEC has been replaced. It is necessary to verify that spark is present when the injector pulse is lost. If the PCM does not detect an engine RPM signal, it will disable the injector pulse. Additionally, the operation of the check engine light should be observed; it should illuminate when the key is on and turn off when the engine is cranked. Typically, when there is a loss of injector driver in the PCM, the noid light remains lit. This suggests a potential wiring issue between the PCM and the injectors. It is challenging to pinpoint the exact location of the issue. There should be power at both the coil and the injectors, as the PCM grounds the injectors to cause the light to pulse. Power is confirmed at the coil since the engine produces a spark when the injector pulse is lost. Testing will be conducted the following day to check for power at the injector. The noid light indicates pulse; however, it is possible to have voltage at the injector without ground, which is necessary for the driver. The injector driver circuit consists of two main wires: Tan/Orange and Tan/Red. A broken splice point, an open circuit, or a poor connection at the PCM pins 58 and 59 may be the cause of the issue.

The described circuit is part of an engine management system, where the Powertrain Control Module (PCM) plays a critical role in managing fuel injection and ignition timing. The injectors are controlled by the PCM through a driver circuit that activates the injectors by providing a ground signal. The Tan/Orange and Tan/Red wires mentioned are integral to this driver circuit, with the Tan/Orange typically serving as the signal wire from the PCM to the injector, while the Tan/Red may be the return path or ground reference.

To troubleshoot this circuit, it is essential to ensure that the PCM is receiving a valid engine RPM signal, as this is necessary for the PCM to enable the injector pulse. If the engine RPM signal is absent, the PCM will disable the injectors to prevent fuel from being injected into the engine, which could lead to flooding or other issues.

The check engine light serves as a diagnostic tool, illuminating when there are faults detected within the engine management system. Its behavior during the key-on and cranking states provides valuable information regarding the operational status of the vehicle's systems.

If the noid light remains lit, it indicates that the PCM is attempting to activate the injectors, but it is not receiving the necessary feedback or is unable to provide a proper ground. This could be due to a number of issues, including broken wiring, poor connections, or internal faults within the PCM itself.

In summary, a systematic approach to troubleshooting the injector circuit should include verifying the integrity of the wiring between the PCM and the injectors, checking for proper voltage and ground at the injectors, and ensuring that the PCM is receiving a valid RPM signal. If necessary, further diagnostic tests may include checking the PCM connectors and inspecting for any signs of damage or corrosion that could impede proper function.after it sets for awhile it runs for a couple seconds you can see injectors pulse then shuts off and no injector pulse does have fire and feul pressure have rebuilt distributor and replaced eec. You need to verify you are getting spark when you loose injector pulse. If the pcm doesnt see any engine rpm signal it will kill the injector pulse. Verify the check engine light operation when the problem occurs. The light should be on with the key on and go out when cranking the engine. When you typically lose an injector driver in the pcm the noid light stays lit, Sounds like you have a wiring problem between the pcm and the injectors. Really hard to tell you where to look on this type of concern. You should at least have power at the coil and the injectors. The pcm grounds the injectors to cause the light to pulse. i do have power at coil because engine still has spark when it looses injector pulse ijust went back to start and it started and ran for a few seconds then shut off.

i will check tomorrow again with test light to see if i have power to injector my noid light would only be showing pulse i could still have volts to injector but no ground ie driver. noid light needs both to work. Ok you have two main wires for the injector driver circuit one is Tan/Orange and the other is Tan/Red see the schematic below.

Either you have a broken splice point or a open circuit, bad connection at the pcm for the driver circuit pins 58 & 59 in the pcm connector. Ask-a-doc Web sites: If you`ve got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers.

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