10 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHSlight rattle noise beginning around 2k rpm when letting off throttle
Leading reported evidence
Test rattles
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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.
Discussions that contain suggestions
1
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 · Original poster
I didn�t find much luck testing for rattles with a rubber mallet against visible exhaust components, but something else I found this morning was that the noise only seems to happen once that car has some warmth in it.
Slight rattle noise beginning around 2k rpm when letting off throttle
Read full discussion summary
Leading evidence: 'Test rattles' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Test rattles' (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.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Test rattles
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1
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 · Original poster
I didn�t find much luck testing for rattles with a rubber mallet against visible exhaust components, but something else I found this morning was that the noise only seems to happen once that car has some warmth in it.
Slight rattle noise beginning around 2k rpm when letting off throttle
Coverage and how to read this overview
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.
10 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 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: 20261026T135432Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I recently noticed my 01 911 Carrera is making a strange rattling / induction-y noise when letting off the throttle. The noise only begins to occur when revs drop to around 2k. The noise isn�t there above it if I were to rev it up. Any thoughts what this might be? Happy to include a sound clip as well.
Few questions, the sound only happens while the RPMs drop, not if you hold it? Can you hear it out of both exhausts or only one? Louder on one side than the other? Any exhaust modifications ever? how many KMs on the vehicle, and has there been any Catalyst System Efficiency Below Threshold codes like p0430 or p0420?
I would manually rev it or have a friend rev it, with your ear near the intake manifold, listen for rattling there. could just be your intake valve. you can pull your air intake off and see if its acting funky visually as well. Other than that, exhaust heat shields, blown out catalytic converters, could be a number of things in the exhaust system.
Thanks for the response! It does seem like it can be heard from either side of the vehicle and does seem to be most notable when letting off the throttle while rpms drop from 2k and below. While on throttle, it drives super smoothly and no sound. The only modifications I�m aware of here are the exhaust tips and the K&N air intake.
It currently has about 77k miles / 123k km. I haven�t had it plugged into an OBD2 reader, but there�s no CEL on at all.
Grab a rubber mallet and start whacking exhaust parts underneath, listen for rattles, and also what i mentioned in the previous response (see edit). I'm staying on the optimistic side of cheap, replaceable parts and not worn out, soon to detonate engine parts. (timing chain tensioner, guides, variocam)
I didn�t find much luck testing for rattles with a rubber mallet against visible exhaust components, but something else I found this morning was that the noise only seems to happen once that car has some warmth in it. Otherwise no noise at all until the car has been idling for a while (again, that noise only occurs after letting off the throttle around 2k)
Oh, I also forgot to add that oil pressure and levels look great. Car starts at a higher pressure and as it warms up, the pressure drops to around 2 bar. Also no smoking or unexpected exhaust activity
Ah well I started doing it maybe 2 or 3 hours since it was last run, so definitely not right after I shut it off but also not while the car was completely cold. I can definitely try again with the car fully warm
