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Old 12-02-2015, 01:16 PM   #1
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Default Car Dies - Wiggle ICM harness, it starts!

So, my car has been dying randomly (still, was doing so earlier, but differently due to the fuel pump which was just replaced, reference this thread, https://www.gmforum.com/2000-2005-90...y-dies-309672/). What I have found out is that if I get out, wiggle the ICM harness where the wires are located, then get back in the car, it will start (I will also hear a small hissing sound when the wires engaged). It appears to be something to do with the harness, but wanted to put it out there for other things to consider. Some other key items associated here:

1. it mostly happens when I get up to speed on the freeway (not the best time to get out of the car to wiggle some wires).
2. I have not pinpointed a particular wire, but trying to see if that is an issue.

A couple thing I have considered:

1. Replacing the wire harness
2. Check the ground, where does the ground wire for the ICM terminate (I have not been able to locate that)?

Any other thoughts are appreciated.
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Old 12-02-2015, 09:50 PM   #2
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I would disconnect the harness from the ICM.......look at the pins in the ICM, and the female connectors in the harness, and green corrosion or black arcing.....if you see nothing, then I would do a drag test on each female pin....this means you would have to go to a GM parts department, and get a male connector that fits the female pin......insert in each connector and pull out......should feel the pin drag as you pull....if it comes out too easy, the connector is loose....either replace the connector(GM Parts Dept.), or try taking a pick and closing the connection, then retry the drag test.....

If the drag test is ok, reconnect the harness, get the car running,, and grab each wire of the harness, individually, pulling in and out and twisting on it....if the car stumbles or dies, could have a bad wire or bad connection where wire is crimped at the female connector....
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Old 12-07-2015, 09:20 PM   #3
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Thanks, Tech II. I actually did this yesterday to take a deeper look at the female connectors on the harness. I did not go to the GM department to get the male connector, rather I took a small T-pin and just placed it (I did not force it) in some of the female connectors. Low and behold, the 12 V feed to the ICM seemed larger than necessary. I was able to pry it closed a little to where I feel more comfortable with the connection. I have not driven it enough since then (only about 10 miles) to see if it worked, but things are looking up.

If anyone has suggestions on prying down the connection, I will try that. My next step if it doesn't go away is to use some tweezers.

I believe this happened when I was troubleshooting the fuel pump (checked electrical first) and I probably put the multimeter probe in that female connector too far and opened up that 12 V female connector. I should not have done this, but wasn't thinking at the time. If I come up with other issues, I will report, otherwise, we can consider this closed.
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Old 12-08-2015, 12:57 AM   #4
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Glad you found the issue, hope it keep running well for you!
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