Question about 1994 Jeep Grand Cherokee
Hello, I've been having problems with starting my jeep grand cherokee with a 4.0L. When I turn the key, the check engine light which normally comes on does not - sometimes if I let the key remain on the on position after a few (up to 5 min)minutes it click on - that is the check engine light and it starts no problem. After the check engine light goes on the first time - if you turn the key again - no problem. I have checked the fuel pump - it is ok - I have replaced the fuel pressure regulator and examined the fuel injectors for leakage - none of these appear to be the problem or the fix. The relays at first make a grinding sound - that is with the first check engine light coming on - do you have any suggestions thanks
Assuming I understand your problem correctly, it sounds as if the car will only start once the check engine light comes on. The check engine light is controlled by the PCM (powertrain control module; or computer) which is also responsible for basically all engine operations including fuel delivery, ignition, emissions, and so on. If this light is not coming on, it means that the computer is not getting power. If the computer is not getting power then it won't start. The fact that you hear the relays click on when the light comes on is another indicator the the computer is not getting power as it also supplies power to the ASD (Automatic Shutdown Relay) which in turn supplies the power to the fuel and ignition systems. Check the ASD relay located in the power distribution center, if it is the same relay number as another un-important system, then swap it out to see if that helps. Make sure the plugs going into the computer are tight. The delay in the power going to the PCM sounds like a stuck relay, have someone tap the relays when the light is off to see if comes on. It is also possible that the PCM itself is failing.
Posted on Dec 16, 2008
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