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Discussion summary
YOUR RESEARCHWeird sound coming from my 996 any ideas?
Reported repair
Replace tank
Reported resolution
1
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0
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1
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Reported fix · Original poster
I had a coolant issue, took it to my mechanic who works on porsches often and problem was fixed he replaced the tank.
Leading evidence: 'Replace tank' (1 discussions report resolution; 0 report an unsuccessful attempt). Across 1 matching discussions, the most frequently mentioned possible cause is 'interconnected given' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Replace tank' (1 discussions). For that action, 1 discussions report a resolution and 0 report an unsuccessful attempt. The most frequently reported fix is 'Replace tank', supported by resolution reports in 1 discussions. These are forum reports and suggestions, not a confirmed diagnosis.
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Performed · outcome unconfirmed · Original poster
i do some of the work by myself, changed the oil before winter.
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Suspected cause · Original poster
I think that the problem is interconnected given that the noise is made in idle sometimes.
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Suggestion · Original poster
I will check off everything that you said though thanks.
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Suggestion
If it didn't take it back, let them figure it out, probably some vacuum line got accidentally disconnected during the coolant tank replacement.
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Suggestion
This process will reset the ECU/DME to default base values, then during your next drive, after the car is at operating temp, the ECU/DME starts to measure everything and reset values.
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Suggestion
This process will reset the ECU/DME to default base values, then during your next drive, after the car is at operating temp, the ECU/DME starts to measure everything and reset values.
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Hey guys I have a 01 996 with 28k miles.
I had a coolant issue, took it to my mechanic who works on porsches often and problem was fixed he replaced the tank. Ever since I got my car back from the shop, something strange has been happening though.
Basically at very warm idle the car is not very steady. It moves between 700-800 rpm but its not really steady. The car does not stall out though or anything. Whenever RPM is below around 700 rpm there is a weird rubbing noise that comes from the car. I can replicate the sound by letting the clutch out in gear to cause the rpms to drop with no gas. Once it hits below 700 boom the sound happens. At first I assumed it would go away after some driving but after 3 months it is still happening. Clutch does not slip and the pedal feels fine. Sometimes on a warm start the rpms go up to 800 and then drop to even 400, makes the noise, then goes back up to 800.The car drives perfectly fine no problems at all other than this one thing. I made a video of me playing the sound. Please excuse the squeek at the beginning that is my croc moving to the clutch. I tried to find the sound opening the engine lid but it is very hard to find where it is exactly. I can make more videos of the sound if more information is needed. Does anyone have any ideas.
PS i took it back to the mechanic and he said it is either the flywheel or the clutch and that its not really a problem. I don't really believe him to be honest after living with this for 3 months. Anyone have any ideas?
You Tube
Your 01 is probably e-gas. Do an e-gas calibration. Turn key to on (not start), keep foot off accelerator (in fact don't touch anything), wait 60 seconds, turn key off and remove. Then start up car normally. You might go as far as to disconnect the negative lead of the battery to reset everything, do it and wait 30 minutes then reconnect. Then do the e-gas calibration cycle again. This process will reset the ECU/DME to default base values, then during your next drive, after the car is at operating temp, the ECU/DME starts to measure everything and reset values.
Oh, and what is with dropping the RPM's to 700 or less? Should be 780 RPM at idle, slightly higher with AC on, but intentionally dragging your engine RPM down using the clutch sounds like a bad idea. Rev it up, engage the clutch, put it in gear, let it out and keep reving!
Thanks for the tip with e-gas ill try that out.
Also I don't let out my clutch to drop the rpms intentionally i was just doing it for the purpose of the video to replicate the sound. During a very warm start up the car drops in rpm for some reason making the weird rub sound then goes back up.
Okay, let's start with some simple maintenance items. Even though it is an 01 with only 28K miles, what type of maintenance has been done? See, it is now a 20 year old car with 28K miles, so not many miles per year. Last oil change? Last air filter change? Last MAF sensor change? Last spark plug and coil change? Any codes or CEL problems? Last brake fluid and clutch fluid change? Do you do any DIY maintenance? Has the throttle body ever been removed and cleaned? Has the clutch been replaced? It could be your dual mass flywheel is faulty and when the RPM's drop that low the dual mass flywheel engages and disengages causing a clunk.
Did it have a high idle before your took it to the mechanic? If it didn't take it back, let them figure it out, probably some vacuum line got accidentally disconnected during the coolant tank replacement.
i do some of the work by myself, changed the oil before winter. The person I bought from had little records of previous
Maintenance
, I can confirm the clutch and flywheel are original, I am getting no codes, I think highest probability might be the flywheel. Doesn't 28k miles seem low for a flywheel change though? I will check off everything that you said though thanks.
Just to be clear; this seems like you�ve got two issues that are separate. Even if they arose at the same time.
The fluttering idle is likely a bad AOS, cracked oil fill tube, or possibly some sort of other vacuum leak. Not unusual to happen after some work where things are getting unattached and reattached and move around to make space.
The other sounds like something in the pressure plate, clutch, flywheel or throw out bearing BUT i would expect that to only happen when clutching in/out not just when the idle varies.
Yeah as I said before it only happens under 700 rpm which I find really odd. Not getting any hiss from the oil cap when i loosen it at idle which I believe to be a sign of AOS. I think that the problem is interconnected given that the noise is made in idle sometimes.
Check out this Porsche TSB from 20 years ago. Seems many new owners had a noisy flywheel that operated just fine but when you paid $80k for your new car, not so good.
