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YOUR RESEARCHLoud intermittent rattle on startup. - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Reported or suspected cause
water pump scraping the engine block
Reported cause
No successful repair reported for this finding.
1
Identified cause
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Suspected cause
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Loud intermittent rattle on startup. - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'water pump scraping the engine block' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'water pump scraping the engine block' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Replace intensity' (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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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
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Loud intermittent rattle on startup. - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace secondary cats
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Discussions
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Suggestion
Still trying to find time to replace the secondary cats with test pipes which will also solve the heat shield rattle.
Loud intermittent rattle on startup. - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Test pipes
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Suggestion
Still trying to find time to replace the secondary cats with test pipes which will also solve the heat shield rattle.
Loud intermittent rattle on startup. - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Use fist
Suggestion or failed attempt
No successful repair reported for this finding.
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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.
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Suggestion
Use your fist to pound around in the trunk with car off.
Loud intermittent rattle on startup. - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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.
11 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: 20261026T130754Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi, got an awful noise developed which seems to be worse just after starting. It changes intensity with idling speed. I have put a video on YouTube
https://youtu.be/4E_SwvBxiUI
You can hear the noise reduce about half way through after the engine has revved.
It appears to be coming from the rear left of car. Pretty sure that it goes away after being driven for a while, definitely seems to be less pronounced after warming up.
Any ideas as to what it can be?
Thanks in advance...
Either a loose heat shield or might be the inside of the catalytic converter has become detached and is rattling around.
With the engine off, tap the catalytic converter with a rubber mallet and see if you can make the same noise.
Hopefully it's just the heat shield.
Use your fist to pound around in the trunk with car off. If heat shield you'll hear it.
Mine made an awful rattle. It was the water pump scraping the engine block.
Chain tensioners have been said to cause start up rattle too.
As said catalysator heat shield. These are holden by DZUS fasteners. In general they rust away and you have to replace them. Expensive.
Regards, Markus
Mine was the O2 sensor that went into the exhaust at the back, it was loose. I just tightened it and all was fine. But I also found that the heat shields for the cat convertors are missing, so the previous owner had removed them for rattling also.
My left cat heat shield rattles. Once in a while I jack up the car and judicially hit the shield with a hammer. That fixes it for a while. Still trying to find time to replace the secondary cats with test pipes which will also solve the heat shield rattle.
I had heat shield rattles/buzzing a while back and when I discovered what it was (thinking it was MUCH worse) I took a hammer to it and beat the crap out of it and wow, that was a lot more satisfying than I imagined.
I just got this as well. I had previously heard it on downshifting after it got hot. Now it's at idle at start up. Sounds like crap and Porsches shouldn't sound like crap...
Think it's the cat, tap it and it rattles, plus a think the heat shields have been removed by previous owner... What the hell do they look like anyway !! Thanks for replies all!
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