Someone fix this for me 🙃
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
Ignition timing comes from the distributor and is controlled by the PCM via the ignition module also mounted on the distributor. One test is to disconnect the PCM and crank the engine, if there is spark the distributor and it's modules are OK and the PCM is the source of the problem, if still no spark then replace the distributor. This assumes the ignition coil is good of course.
The computer ignores most of the sensors at cold start so it and the distributor are all that is needed to get it running, of course all the other sensors quickly come into play so they are all necessary eventually.
The computer ignores most of the sensors at cold start so it and the distributor are all that is needed to get it running, of course all the other sensors quickly come into play so they are all necessary eventually.
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Ignition timing comes from the distributor and is controlled by the PCM via the ignition module also mounted on the distributor. One test is to disconnect the PCM and crank the engine, if there is spark the distributor and it's modules are OK and the PCM is the source of the problem, if still no spark then replace the distributor. This assumes the ignition coil is good of course.
The computer ignores most of the sensors at cold start so it and the distributor are all that is needed to get it running, of course all the other sensors quickly come into play so they are all necessary eventually.
The computer ignores most of the sensors at cold start so it and the distributor are all that is needed to get it running, of course all the other sensors quickly come into play so they are all necessary eventually.
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it’s not getting spark from the coil, and it has new fuel pumps
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FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Have you tested fuel pressure at the motor? You have to positively rule that out as it's easy to reverse the wires on a fuel pump and have a case where is works but is pushing back into the tank instead of to the motor.
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New User
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It’s not a fuel problem hence it ran fine before it lost spark, it has absolutely no spark
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
The it's got to be electrical. What year is the replacement wiring harness and how much of it was replaced? I suspect you are talking about the part from the round junction connectors on the inner fender to the motor, is that right or was there more?
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New User
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all I replaced was the actual engine harness, the entire harness from the ecm to each individual pig tail including the ecm, I got both the harness and ecm from a truck in the junk yard today, I did open the harness up to make sure everything was okay and there wasn’t anything obvious before I installed it. And it came from a 87 as well
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
Pull the distributor cap off and crank the motor to see if the rotor is actually turning. There have been cases where the pin in the distributor gear sheers off and the shaft no longer spins.
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I have 😅 any other ideas?
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Damn,.. I can see how this would be frustrating. Time to put the other distributor in it, you should have spark with just that and a known good ignition coil. The correct ignition module for your vintage truck will be grey as well, don't let them sell you a black one.
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yeah I got a brand new one I’m gonna put in it hopefully tomorrow or either Monday and yes I got the grey one when I replaced that as well, I’m just tired of pulling my hair out on what it is!