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Thought I would share my experience. I have a '91 940T - 193K. My wife is driving it ...it quits. She calls and asks "Has it ever backfired and belched black smoke out the back?" No was the response. Would not go at all. Had it towed to a good mechanic (not my regular). Get it back the next day. He replaced the cap and rotor. Showed me the old one, and it was not damaged, but had carbon tracking all down the back.
Have not tried to clean it up and reuse (have a high priced new one now), but I feel relatively sure that it would work fine. Those heavy bakelite caps are hard to break, and I do not think this one is.
Next time that I get that odd sense when I crank it, like it is almost stuck by high, high compression ...I will pull that cap and clean it. That is what I had noticed for about the last week or so before this happened.
Andrew in AL
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