Quote:
Originally Posted by Racer Boy
These cars make a rumbling sound right at 3,000 rpm, due to a resonance in the engine. Mine does it, but I only hear it while in the lower gears where the road noise is lower.
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Sounds like exactly what is with my car has. Light rumble but it's annoying, since speeds I drive here is fairly much on close to 3000rpm. I'd like to think that Porsche cars would run smooth thru out the rpm - at least my two previous ones were (1986 944 and 1985 Carrera 3.2).
Quote:
Originally Posted by Steelepuls
Pilot4fn, The coil packs can definitely be one of the causes. My car is a 2001 S with 106000 miles, I did everything you have done as well. I got help from this forum, the guys here know their stuff. Coil packs are one of the items that was highly recommended to fix this problem. I've only put in about 50 miles since doing this service, but from what I noticed, the rumble is gone. Also, the Pelican site says to change the spark plugs every 10000 miles, so if you've got more than that on plugs you currently have, I would change both of them at the same time. Your already in there, so why not. I had over 20k miles on the plugs and when I took them out, the tips were almost gone. LOL. Good Luck.
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I changed the plugs approx 5000miles ago and the current plugs condition is very good. Car runs awesome besides the light rumbele at 3000rpm.
Quote:
Originally Posted by Qingdao
Piolet4fn: do you have any CELs? Do you have any pending CELs?
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No CEL's of any kind of, not even pending ones. I have Durametric and that can't find any issues - at least so far.
Also, regardless of the weather (dry and sunny, humid, misty, heavy rain, etc.) car runs real well. My understanding is that if coilspacks are going bad, most of the time it would be related to cracks on the coilpacks and cause problems especially on the wet weather driving conditions.