KNOCKING SOUND FROM ENGINE OF CAYENNE S 2011
02-07-2011, 12:10 PM
#1
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KNOCKING SOUND FROM ENGINE OF CAYENNE S 2011
found another concern lately. There is a knocking sound as i accelerate from standstill or when driving slowly at high gear. The sound of knocking as if using a low octane gas/petrol. I am currently using Octane 98 so should not be the case. Anyone has encountered this sound?
09-27-2012, 12:36 PM
#7
Drifting
I've seen A/C lines tapping against the firewall cause a knocking sound on a 2011 Cayenne S, however I would definitely get it checked out ASAP to be sure it isn't an internal issue.
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09-27-2012, 08:19 PM
#8
The V8 Porschephile
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According to PAG, minor knocking, pinging or pre-detonation is somewhat normal on all V-8 equipped Cayennes. On some models, it's more noticeable than others.
Most owners don't even hear it however, start out in 2nd gear and drive slowly next to any wall or barrier with your window open and it'll be obviously noticeable.
Most owners don't even hear it however, start out in 2nd gear and drive slowly next to any wall or barrier with your window open and it'll be obviously noticeable.
09-28-2012, 01:53 AM
#10
The knocking sound in my 2005 4.5L V-8 was scoring in the cylinder walls on 3 of the 8 cylinders. This was a known issue with PAG.
The scoring was a result of piston coatings transferring from the piston skirt to the cylinder wall.
The rings then bedded the material to the cylinder walls and caused low compression and knocking.
The result was a warranted long-block engine replacement to the tune of $14,000
I sincerely hope this is not your situation.
The only clear-cut way to diagnose is to bore-scope the cylinders and look for scoring.
If this is the case, your dealer will likely avoid and deny the issue is even a remote possibility until you make them scope it.
The issue seems to affect cold weather cars more than warm weather cars. If you are in a warm climate, then you are probably OK
The scoring was a result of piston coatings transferring from the piston skirt to the cylinder wall.
The rings then bedded the material to the cylinder walls and caused low compression and knocking.
The result was a warranted long-block engine replacement to the tune of $14,000
I sincerely hope this is not your situation.
The only clear-cut way to diagnose is to bore-scope the cylinders and look for scoring.
If this is the case, your dealer will likely avoid and deny the issue is even a remote possibility until you make them scope it.
The issue seems to affect cold weather cars more than warm weather cars. If you are in a warm climate, then you are probably OK
10-04-2012, 10:23 AM
#12
The knocking sound in my 2005 4.5L V-8 was scoring in the cylinder walls on 3 of the 8 cylinders. This was a known issue with PAG.
The scoring was a result of piston coatings transferring from the piston skirt to the cylinder wall.
The rings then bedded the material to the cylinder walls and caused low compression and knocking.
The result was a warranted long-block engine replacement to the tune of $14,000
I sincerely hope this is not your situation.
The only clear-cut way to diagnose is to bore-scope the cylinders and look for scoring.
If this is the case, your dealer will likely avoid and deny the issue is even a remote possibility until you make them scope it.
The issue seems to affect cold weather cars more than warm weather cars. If you are in a warm climate, then you are probably OK
The scoring was a result of piston coatings transferring from the piston skirt to the cylinder wall.
The rings then bedded the material to the cylinder walls and caused low compression and knocking.
The result was a warranted long-block engine replacement to the tune of $14,000
I sincerely hope this is not your situation.
The only clear-cut way to diagnose is to bore-scope the cylinders and look for scoring.
If this is the case, your dealer will likely avoid and deny the issue is even a remote possibility until you make them scope it.
The issue seems to affect cold weather cars more than warm weather cars. If you are in a warm climate, then you are probably OK
10-04-2012, 12:07 PM
#13
Drifting
When I worked at the dealer, I saw about 8 4.5 non-turbo engine failures that all started with cylinder wall scoring. I saw no turbo engine failures. The 4.5 turbo has piston oil jets, so I figure that's what made the difference.
10-04-2012, 07:29 PM
#14
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According to PAG, minor knocking, pinging or pre-detonation is somewhat normal on all V-8 equipped Cayennes. On some models, it's more noticeable than others.
Most owners don't even hear it however, start out in 2nd gear and drive slowly next to any wall or barrier with your window open and it'll be obviously noticeable.
Most owners don't even hear it however, start out in 2nd gear and drive slowly next to any wall or barrier with your window open and it'll be obviously noticeable.
10-04-2012, 08:55 PM
#15
Race Director
....though mine uses less than 1/4 qt. in 7,500 mi.