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YOUR RESEARCHLoud Rattling noise coming from engine!! Please Help!! - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Reported or suspected cause
throwout bearing
Suggestion or failed attempt
No successful repair reported for this finding.
0
Identified cause
1
Suspected cause
0
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Discussions that suspect a cause
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Suspected cause · Original poster
I did a little research and thought it was the throwout bearing so I replaced that but the sound is still there.
Loud Rattling noise coming from engine!! Please Help!! - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'throwout bearing' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'throwout bearing' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Replace gear and the driveline clunk would complement the rattle' (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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Replace gear and the driveline clunk would complement the rattle
Suggestion or failed attempt
No successful repair reported for this finding.
0
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0
Unsuccessful attempts
1
Discussions
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Suggestion
If the engine mount was that bad you'd barely be able to change gear and the driveline clunk would complement the rattle.
Loud Rattling noise coming from engine!! Please Help!! - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace recently
Suggestion or failed attempt
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0
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0
Unsuccessful attempts
1
Discussions
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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.
Loud Rattling noise coming from engine!! Please Help!! - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace trans
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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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
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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
The clutch / flywheel is cheap compared to the cost of remove & replace trans.
Loud Rattling noise coming from engine!! Please Help!! - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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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.
986Forum: 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: 20261026T205155Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hello,
I have a 1997 Porsche Boxster, 6 speed with 61k original miles. About two weeks ago I started hearing a loud rattling sound coming from the engine, the car drives perfectly fine, goes into gear smoothly, when I push the clutch in the sound goes away. I did a little research and thought it was the throwout bearing so I replaced that but the sound is still there. This is my first Porsche and I don't know too much about them so if anyone can give me some advice it would be much appreciated. Thank you so much!!
It's kind of pricey to replace the whole clutch at the moment plus I was told the clutch is good, the gears go in perfect, just the throwout bearing needed replacing. Thank you for your reply!
My guesses, in order of ease to fix;
1) exhaust leak or loose heat shield (will increase under load)
2) flywheel, especially if it's a lightweight
3) transmission input shaft bearing (highly unlikely)
My money is on #1 as this is a very common issue with the 986.
Flywheel is why I asked if it was a full job. The clutch / flywheel is cheap compared to the cost of remove & replace trans. You only want to do that once in many thousand miles.
typically, this is when most stop driving the car and visit a professional.
If you don't know the issue how can you be sure you are not creating a bigger problem by driving it?
btw, your car looks heavily modified. Were the headers replaced recently? They may be rubbing. I think that sound goes away when the clutch is engaged and starts rattling again when the car is idling.
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