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Can spark-plug-coil-misfire kill the PCM?

5 messages,  Last post on Mar 13, 2009 at 7:02 AM

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What is this discussion about? Mazda Tribute, Ford Escape, SUV

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#4 of 5 Re: Naive Diagnostics [vic777] by bhut May 20, 2008 (6:29 pm)
Replying to: vic777 (Mar 15, 2008 12:49 am) My wife and I just picked up her 05 V6 Tribute from the dealer tonight for this exact problem, but luckily it was repaired under warranty (43K miles). We were told a TSB exists on the spark plugs which can cause the coil packs to malfunction, ultimately this led to the PCM dying. At least that's the theory. Our Tribute has always been slower to start in my opinion, pretty much matching your experience prior to the repair. Our truck has never performed well in the mileage department, so I am hoping this improves that end of it. I've been working on vehicles as a shade tree mechanic (for fun no less) for the better part of 20 years, and had never heard of spark plugs causing PCM failure. On the other hand, I spent 8 years working in electronics and saw how sensitive some components can be, particularly to operation outside of their intended range. In my opinion, either the plant got a really bad batch of plugs in 2005, or the coil packs are too sensitive to impedance/load variations. Whatever the case, you may be able to petition Mazda about the coil costs, since a TSB apparently exists for the spark plugs and their potential for damage to the coils.
#5 of 5 Check engine light by beargiel Mar 13, 2009 (7:02 am)
My 2002 Tribute will spit and sputter, not accelerate like it should and check engine light comes on ONLY when it is wet outside. Once it sits in a dry location/weather for a day, it runs fine. Do you know?

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