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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH996 Screeching sound
Leading reported evidence
Replace ims bearing (ln engineering) and clutch last january
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed · Original poster
PO replaced the IMS bearing (LN Engineering) and clutch last January.
Leading evidence: 'Replace ims bearing (ln engineering) and clutch last january' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check accessory drive belt' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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1
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Performed · outcome unconfirmed
First time this happened was before I replaced the O-rings in the spark plug tubes.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Suggestion
Turns out that the gravel DOT uses instead of sand is just the right size to bounce up between the rotors and the weather guard on the backside of the rotor.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Suggestion
Once I had to take the wheel off and use a piece of Alum TIG rod for a probe to wiggle it out.
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
Turns out that the gravel DOT uses instead of sand is just the right size to bounce up between the rotors and the weather guard on the backside of the rotor.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
11 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Pelican Parts: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261027T084359Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I recently got a 99 996 and every now and then I hear a screeching sound when I accelerate from standing still. It's not constant and sometimes it's louder and longer than other times. It's not there most of the time.
The best way to describe the sound is: The sound of a chair being dragged across the floor
Any idea what this could be? The car has manual trans and 106K miles. PO replaced the IMS bearing (LN Engineering) and clutch last January.
I'm not too worried about it, but it's not a nice sound.
Thanks
Please check this article, may be it could help you,
Pelican Porsche Tech Article - IMS Bearing Replacement - Porsche 911 Carrera - Porsche 996 Carrera (1998-2005), Porsche 997 Carrera (2005-2008)
Thanks, but as I said above:
PO replaced the IMS bearing (LN Engineering) and clutch last January.
That's perhaps 10-12K miles ago. And this was a reputable shop. House Automotive
My 99C4 has a clutch on the alternator.
could this be causing the noise?
I think it supposed to let it freewheel on engine decal but if the one-way mech. is going it might be slipping on accel.
at least it a maybe.
Anyone know how to check it?
Luck
The sounds comes and goes. But I had my brother sitting in the car this past week and it sounds like the sound is coming from the rear and more specifically from the rear wheels... Possibly the calipers sticking?
The sound tends to come when the car is warm, but it's very random. And trying to recreate it is very hard.
I almost forgot about something that has happened to me.
On my '99 C4 I got what sounded like the brake lining had fallen off the pad and I had metal on metal contact. It's happened more than once.
Turns out that the gravel DOT uses instead of sand is just the right size to bounce up between the rotors and the weather guard on the backside of the rotor. Once it's in there the guard acts like a sounding board.
Not quite the sound you describe but try stopping and rolling slowly backward. Maybe you'll get lucky and have a passenger that can get out and listen for where the noise is from.
Once I had to take the wheel off and use a piece of Alum TIG rod for a probe to wiggle it out.
First time this happened was before I replaced the O-rings in the spark plug tubes.
Went screaming down the on-ramp and as looked in the mirror I saw smoke and a gawd-awful screech from the back of the car.
The noise didn't stop until I hit the next off ramp and found safe spot to check out the heck was going on. Rolling backwards cleared that one.
Also check your accessory drive belt.
Or change it if you don't know when it was last changed.
While you have the belt off spin all of the pulleys to check for, noisy/loose/rough bearings.
I have a similar problem for about 3yrs now, but mine is still with stock IMS and clutch on a 99.
Mine always goes away once the engine warms up, but can be reproduce for a very short time if engine cool down just a little, but goes away again once warm. Also it happens even with accessory belt off (so it's not any auxiliary pulley).
I'm interested in this thread and how you will resolve it. I have read that sometimes a slightly loose spark plug can cause this, something to look into (I haven't had the chance and won't get to climb under it until around Mid-July).
Good luck and keep us updated please.
I'm going to pull the belt and replace it and the idler/rollers/pulleys too.
Zmonsta: It's weird that this sound keeps coming and no one knows where its from... Mine seem to come when the car is warm(er), never on cold starts.
I had a really loud long one and I think I felt it though my shifter...
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