10 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHPiston slap?
Reported or suspected cause
wear and doesn’t come and go
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
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 report identifying a cause
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.
Reported cause
Typically, piston slap is due to wear and doesn’t come and go.
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
I may get codes after disconnecting the battery for 6 months, but once it runs, warms up at idle and then starts again later, any connection/sensor etc issue is fine.
Leading evidence: 'wear and doesn’t come and go' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'wear and doesn’t come and go' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Disconnect battery' (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.
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
I may get codes after disconnecting the battery for 6 months, but once it runs, warms up at idle and then starts again later, any connection/sensor etc issue is fine.
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
When I take my Cayman out of storage it needs to run until operating temp first.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Disconnect battery
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
I may get codes after disconnecting the battery for 6 months, but once it runs, warms up at idle and then starts again later, any connection/sensor etc issue is fine.
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.
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: 20261026T165820Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I recently took out my 99' Porsche Carrera from winter storage. It has 104,000 miles. It started right up. No weird noises.
When I got home after about a 5 mile drive that included expressway and city portions, I noticed a metal clicking noise that was very loud right next to the right rear wheel.
Listening to some UTube videos it kind sound like Piston slap. It increased slightly with RPM's or turning on the AC.
Now here is the thing, I turned off the engine and turned it back on and the sound was there. Then I stuck the car in the garage for a bit, went back out and started it and couldn't hear a thing wrong. Ran it for 15 minutes with AC blasting to stress everything and it is still quiet.
My question is, how can I tell if I had piston slap? It was a loud sound at that one time but it has not returned.? Is there anything I should do? Could the storage have impacted this?
I'm thinking of selling it and now this comes up.
Suggestions?
Edited to add Ytube link of sound
https://www.youtube.com/watch?v=Qle3bhfNizA&feature=youtu.be
Typically, piston slap is due to wear and doesn’t come and go.
If you’re concerned about your cylinders, get them borascoped.
When I take my Cayman out of storage it needs to run until operating temp first. I may get codes after disconnecting the battery for 6 months, but once it runs, warms up at idle and then starts again later, any connection/sensor etc issue is fine.
If your noise comes back, try and isolate it with the ac off and see if it’s engine, alternator, air pump, water pump etc. lots of things running at the same time.
Thanks for the reply. I am guessing at this point.
Took the car out to show to a potential buyer. It started right up with absolutely no issues.
We took it on a 5-7 mile circuit. Warmed up on city streets then hit around 75mph for 3 miles than back down towards home on city streets again.
We pulled in the driveway and sat at idle talking and he mentioned a noise. We got out and a fairly loud repetitive metal on metal sound was very prominent at the right rear side of the engine.
We turned it on and off a couple times and the sound was always right there.
After he left I parked it back in the garage. 30 minutes later I started it up and at idle the sound disappeared!
Next day, same thing. Runs and sounds normal.
I listened to UTube and the sound was almost identical to a recording of piston slap that's why I was worried.
I am also thinking it could be detonation? I know I put in correct octant when I filled it but this is first time I ran it this year and down to below 1/4 tank. Think that could be an issue? I am going to fill it with the highest octane I can find and go from there.
I uploaded a recording video to UTube to help figure this out.
Note: On cold startup the sound is not present.
After idling till warmup, the sound is not present.
After driving 5-6 miles the sound starts and continues even at idle.
https://www.youtube.com/watch?v=Qle3bhfNizA&feature=youtu.be
