Quote:
Originally Posted by tonythetarga
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 mouse 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.
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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.