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Old 08-27-2011, 12:44 PM
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Strange ignition

I have a 92 4.3 Olds Bravada daily driver and the problem I am having is, well I think weird. I drove to work and parked it. In the evening I went to leave and it would not start. Tested and found no spark. Cap and Rotor were in need of change- so I changed it but it still would not start when warm. Here is the description of conditions:
*Engine at 140f it has no spark. Let it cool to 100 and it sparks. Will run until shut off but won't restart until cool.
*I removed ECM and cleaned the old paste from under the ECM and recoated with Dielectric grease.
It ran good and restarted several times and then it failed to restart.
I am wondering if the Dielectric grease might have broke down and lost the ability to be a heat barrier? Or do you have any other ideas.
I tried to test but it is intermittent and it has to be pretty warm to fail.
Thank you-

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Old 08-27-2011, 01:01 PM
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Quote:
Originally Posted by Jimmy Joe Jim Bob
I have a 92 4.3 Olds Bravada daily driver and the problem I am having is, well I think weird. I drove to work and parked it. In the evening I went to leave and it would not start. Tested and found no spark. Cap and Rotor were in need of change- so I changed it but it still would not start when warm. Here is the description of conditions:
*Engine at 140f it has no spark. Let it cool to 100 and it sparks. Will run until shut off but won't restart until cool.
*I removed ECM and cleaned the old paste from under the ECM and recoated with Dielectric grease.
It ran good and restarted several times and then it failed to restart.
I am wondering if the Dielectric grease might have broke down and lost the ability to be a heat barrier? Or do you have any other ideas.
I tried to test but it is intermittent and it has to be pretty warm to fail.
Thank you-
The right compound to use is a heat transfer paste, not a heat barrier unless a heat barrier is specifically called for. If what you removed was a white paste, it was a thermal conductive material most likely. Arctic Silver 5 Polysynthetic Thermal Paste is one brand. Radio Shack or a computer repair facility will have the right stuff.
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Old 08-27-2011, 02:37 PM
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I have purchased the heat sink grease as discussed and since I am at work I have not had the chance to try it yet but I was wondering if anyone had any other ideas?
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Old 08-30-2011, 11:43 AM
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The control modules in those vehicles were subject to failure under the conditions you describe. The coatings on the inside broke down and caused separations of components when hot. after cooling (contracting) it would start. If you buy another module make sure it is NOT stamped "made in china" that's where the bad boards came from for a lot of these units. Try to find one from USA, Puerto Rico, or even Mexico. Good luck.
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