19 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHKnocks and Pings
Leading reported evidence
Use chevron 91 ron
Performed · outcome unconfirmed
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 performed work without a confirmed outcome
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.
Leading evidence: 'Use chevron 91 ron' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'metal contraction' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check with your service department' (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 suspect 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.
Suspected cause
Yes, I am really just referring to the post-drive 'knocking' or 'pinging' from the exhaust area, likely the metal contraction, so I am probably misusing the 'knocks and pings' term (I agree Russ K - the car is surely tuned properly, and 93 octane gas ought to be ok).
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.
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 think of knocks and pings, I think of pings when accellerating while using cheap gas and knocks would occur after turning off the engine whereas the engine would keep running until you push and hold down the gas pedal to flood it out, then the knocks along with the engine stop.
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
Using brand name high octane gas from a couple different sources.
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 think of knocks and pings, I think of pings when accellerating while using cheap gas and knocks would occur after turning off the engine whereas the engine would keep running until you push and hold down the gas pedal to flood it out, then the knocks along with the engine stop.
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 think of knocks and pings, I think of pings when accellerating while using cheap gas and knocks would occur after turning off the engine whereas the engine would keep running until you push and hold down the gas pedal to flood it out, then the knocks along with the engine stop.
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've owned 5 911s (the Cayman will be my 6th Porsche and first non-911) and the way they do the exhaust systems using much heat shielding material, plus because the engine is either mid-mounted or in the rear, the system is very close to the engine - source of that heat, it tends to get pretty hot.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
metal contraction
No successful repair reported for this finding.
0
Identified cause
1
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that suspect 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.
Suspected cause
Yes, I am really just referring to the post-drive 'knocking' or 'pinging' from the exhaust area, likely the metal contraction, so I am probably misusing the 'knocks and pings' term (I agree Russ K - the car is surely tuned properly, and 93 octane gas ought to be ok).
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.
19 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Planet-9: 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: 20261027T003124Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I am at about 730 miles so far and tank of gas number 3, still a great deal of knocks and pings upon shutdown. Is anyone else experiencing the same? Normal? Something to talk to the dealer about when I pick up my plates Saturday?
Edited by - RCayR on 01/26/2006 6:51:19 PM
I am not sure that I understand your question correctly, but if you are talking about the pings right after shutting down the engine lasting a good 30 mins or so, that is completely normal. Those are the sounds that various metals, generally from the exhaust, contracting relatively rapidly after use. Every car makes those. I assume those are the pings we are talking about; I would not call them 'knocks' however, not that loud.
'Knocks' may be too serious a description - yes they are just pings right after shut down from the exhaust area. Nothing I haven't heard on plenty of other people's cars, just surprised I am hearing it in this case. Using brand name high octane gas from a couple different sources. I'll be running it by the dealer Saturday when I pick up the license plates. As most posters seem to be west coast folks, and I am freezing here in NJ, I wonder if perhaps weather is a factor (can you tell I am hoping for an easy explanation?)
FT's diagnosis is probably correct. It's just the heat-shields contracting after shut-down. If your car was knocking as seriously as you initially described, your car would mostlikelyhave triggered a Check Engine light and wouldn't be drivable. Btw, my Cayman as with all my other cars do have heat-shield contracting sounds after shut-down.
No worries, enjoy the car.
Edited by - VicL on 01/27/2006 10:40:02 AM
If it is what FT is explaining about, mine is making many noises like metal contracting etc. after I park the car and shut it off that last about 15-20 min. I have noticed that and the smell of 'curing' paint fromthe engine bay as well. Good luck and enjoy the car.
When I think of knocks and pings, I think of pings when accellerating while using cheap gas and knocks would occur after turning off the engine whereas the engine would keep running until you push and hold down the gas pedal to flood it out, then the knocks along with the engine stop. I think we use to call that 'pre ignition'.
I think everyone at one time or another has had a car that does that on cheap gas or one that has been poorly tuned. I can't imagine that being the case with your Cayman?
Russ
986 Boxster always made those noises well after shutoff. Different rates of thermal expansion/contraction of materials. "Knocks and Pings" are terms generally applied to detonation within the cylinder due to poor quality gas or spark problems.
I agree with FT, my boxster always 'talks back to me' after running it for awhile. The metal reachs extreme tempretures, what your hearing may wellbe normal expansion and contraction of metal.
David
The more I listen you your responses the more I realize how ambiguous my initial question was! Yes, I am really just referring to the post-drive 'knocking' or 'pinging' from the exhaust area, likely the metal contraction, so I am probably misusing the 'knocks and pings' term (I agree Russ K - the car is surely tuned properly, and 93 octane gas ought to be ok). I feel much better about this, but I will still bring it up tomorrow morning at the dealer. Thanks again for all the helpful responses!
If the sounds are more like clicking and clinging and the car is not shaking, which is usually the case when a vehicle's engine continues to fire/mis-fire after the ignition is turned off, then, Yes, my car does this. My BMW does the same after it has been driven to the point where the brakes and exhaust are hot. Performance vehicles make these sounds when they cool down.
Edited by - mpollard on 01/27/2006 09:17:58 AM
RCayR,
You last post is correct. All Porsches do this... I've owned 5 911s (the Cayman will be my 6th Porsche and first non-911) and the way they do the exhaust systems using much heat shielding material, plus because the engine is either mid-mounted or in the rear, the system is very close to the engine - source of that heat, it tends to get pretty hot. In fact, if you cover your car right after you get home from a drive, be careful not to bring the cover right down onto your exhaust tips they're very hot and will singe and possibly burn the cover material - I learned that from direct experience. My present car, a 996 turbo has made those noises for a good 20 minutes or so after shut down since new. The older air-cooled Porsches would do the same thing for an even longer time. It's nothing to worry about.
brad
I did notice the sounds at shutdown, but I thought he was talking about the sounds continued a little after shutdown. Now after closer study I think it could be normal. Especially if you do what I did this morning, I was backing into a parking space and it was a bit of an incline, I lugged it and stalled it out, there was quite a variety of sounds. clunks, knocks and pings).
Russ
This is a source reference. Confirm exact model applicability in the original material.
