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Yesterday I wanted to suss out whether my coilpacks had any obvious signs of giving up. My car had developed a hesitation from around 4500rpm to 5500 rpm which was annoying but otherwise didn't really affect performance. Anyway I hadn't banked on simply taking the cover to be as big a pain as it is and ran out of time to take the coilpacks out and/or inspect/replace the spark plugs. The coilpack cover didn't appear to serve any major purpose other than to possibly lower the heat getting so left the cover off and reattached everything.

Anyway this morning driving to work the car drove well while still in cold start but as the car warmed it seemed to miss a bit when just cruising at 60 in 4th. It wasn't a major issue and work is very close. On the drive home it did the same thing only problem is it's warmer midday as well as there being much more traffic meaning bit longer commute home. Therefore as the car warmed up the issue got worst and worst I never tried to boot it but it got to a point where only very small throttle could be used otherwise the car would go nowhere. My guess was that some part of the coilpack cover is used for grounding but after inspecting it I can't seem to find this to be the particularly due to the fact the cover is plastic.

Is this my coilpacks having given up altogether suddenly? I don't think there is anything loose or unplugged have double checked that. Seems strange it gets a lot worst with the motor warmed up compared to cold.

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https://www.sau.com.au/forums/topic/369722-r34-coilpack-cover/
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