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Old 07-13-2004, 02:53 PM
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overheating ignition module???

Hi everybody, I have a strange problem. The car is a 83 jaguar xj6. Last week I had a problem where it wasn't getting any spark. I replaced the coil and ignition module (gm module) it made no difference. I replaced the pickup module in the distributor, and voila, she runs. Now it has developed a different problem, it runs great until it reaches full temperature. After driving for about half an hour the car will stumble and then stall on idle. It seems fine over 2000 rpm, but when I slow down (say approaching a major intersection) it stumbles and dies. It won't start for about 5 minutes, and then it'll start and be fine for a few minutes until it won't idle again. When it won't start, it'll kick for a second and then stall. It really feels like a fuel problem, but I'm suspicious considering I've just been doing a lot of ignition work. Is it possible that the ignition module is heating up and failing when hot? Then when it cools down it'll work again? Any other ideas? Thanks,
dh

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Old 07-13-2004, 06:02 PM
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Module

[color=yellow][size=2]Doc Here

Did you use lot's of silicone grease when you installed the new module after cleaning off the old stuff?

These Modules are extremely Heat sensitive and will overheat without the grease...(heatsink Compound)

As to if it will run better when cool.... Roll the dice... might, might not... my experience has almost always been the latter...once they make travel arrangements... they are on their way to where old modules go to die....

Also it's not uncommon to get a bad one out of the box 1 or 2 times in a row... take it back and say it failed right after you installed it and ran it for a few minutes, any good store will / Should exchange it for ya...

Is it TBI, or Carbbed? One way to eliminate or include the Fuel suspicions... next time it dies carry a can of start fluid with you, carefully spray it down the throat, like right after, and try to restart with air cleaner on (in case of backfire)..., If it does start, then die... It's Not fire, but fuel most likely.

I'd vote for the module though...

Doc
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Old 07-14-2004, 02:01 AM
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Thanks for the reply. Yeah, the module had lots of dielectric grease on it. Whatever the problem is, it really seems to be triggered by the heat. When the car first starts it's fine. It isn't until it's really hot (running for about half an hour) that this starts. If it cools for a while, it'll run fine again until it gets really hot again. On these jags the module is mounted on the front of the block. Doesn't seem like a great place to me; it's hot there!
Tomorrow I'm going to put a different module in and see if that changes anything.
The car is fuel injected. Somebody else mentioned that it could be a engine temp sensor malfunctioning, causing it to think it's cold and run rich. I'll check it but I don't think it's rich; I haven't noticed any black smoke.
I'll report back if anything changes,
dh
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Old 07-16-2004, 12:45 PM
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I changed the ignition module and so far it looks like that fixed it. I've run it real hot a couple times and it hasn't stalled yet.
So apparently the previous module worked fine when cold, but was faulty when hot. Thanks for the help,
dh
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