View Full Version : 02 4.2 low compresson on one cylinder
Turbo_B5
10-25-2016, 10:19 PM
Hey on an 02 a6 4.2 what is low compresson on only one cylinder likely to be? rings? valves? walls? It was testing 30 and i added abit of oil, not enough and it came up to 60. Rings?
RENOxDECEPTION
10-26-2016, 01:46 AM
Ring land failure, likely.
glennda5id
10-26-2016, 07:36 AM
Perform a leak down test.
Turbo_B5
10-26-2016, 02:43 PM
Buying the engine this weekend. Will perform a leak down test soon after that.
Really hoping that new rings on the one cylinder will fix the issue. Will keep this thread informed if I remember.
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RENOxDECEPTION
10-27-2016, 02:43 PM
Perform a leak down test.
What would that tell him? The compression test number going up with "not enough" oil in the cylinder seems conclusive.
Turbo_B5
10-27-2016, 03:27 PM
What would that tell him? The compression test number going up with "not enough" oil in the cylinder seems conclusive.
Two straws worth of oil to be exact. Probably less then that actually made it in. Thus assuming the whole ring wasn't coated in oil cause it's a v8 and slanted.
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RENOxDECEPTION
10-27-2016, 07:08 PM
"To be exact"
Anyway, furthers my point. Rings are fucked. Heads probably good.