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YOUR RESEARCHKnocking noise concerns
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Use oil
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Hey guys been enjoying my new to me 02 996 for the past 2 weeks or so. It's been great so far besides a few quirks here and there, but a new noise popped up last week. Read a lot about borescoring concerns and how sometimes a bad cat causes knocking noises as well. Not too mechanically inclined so planning on bringing it into the shop in a few days but wanted some preliminary thoughts
Here's a few videos that showcase the sounds for a cold start, cold idle, and warm idle.
Cold Start
Cold Idle
Warm Idle
No smoke coming out from the exhaust on a cold start. I believe the whine on start up is a bad idler pulley. Let me know what you guys think! Happy to finally join the community with my own Porsche regardless of its current or future issues lol
I have a thread about
hot
engine and tick. A little gas the tick goes away. Engine cools down, tick goes away. I added oil so it went from mid way on stick, to 3/4 of way. No more tick. Something to try maybe.
The whine on startup is your secondary air pump and is normal.
The knock sounds worrisome. IMO not just the normal warm idle tick. I�d get a pro to look at it asap.
Well, knowing engines in general, that exactly sounds like a lifter. But on our 996 the common lifter type noise is 9 out of 10 times piston slap. And yours sounds like advanced slap.
Disclaimer_: Take into consideration, Video noise can be very deceiving vs in person. You've essentially lost all your ears stereo pinpointing and proximity to volume sense, and many vids do not convey the true tone.
So. without more troubleshooting tests, no way to confirm your problem. Any diagnosis from hearing your video is a educated guess at best.
Time for the sump plate off and a lower cylinder bore scope. Or could try a spark plug hole bore scope, or both.
Have you done a compression test.? Does it use oil..? Hows the blow by rate..? Are the tail pipes sooty..?
jmo
