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Compression test results

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Old 03-22-2013, 10:07 PM
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Default Compression test results

Ok so my car throws a temporary misfire code and i can kinda feel it at idle. However it drives fine and has power even when getting on it. So today i did a compression test and here are the numbers i got.
(motor was ran for good 20 minutes to warm it up and did a dry test)
Cyl #1 220
Cyl #2 178
Cyl #3 240
Cyl #4 250

***EDIT: I did pull the 15amp fuel pump fuse under the dash, and i removed 1 spark plug at a time, and putting it back in after finishing that cylinder. Also WOT when cranking the car 8 times.***

So since i questioned cylinder 2 i tested it again and got 175psi on dry. Then i put a little oil in that cylinder and performed a wet test and got the #195psi. It did not significantly jump back up very high so im kinda stuck on thinking could it be more of a piston ring or a valve issue? I know i should do a leak down test, but i do not have access to a leakdown tester.

Curious to know if any s2k members could chime in with professional opinions, i would highly appreciate some thoughts.

Thanks
-S2kOutlaw
Old 03-23-2013, 05:32 AM
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Did you pull the fuel injector plugs or EFI fuse? All spark plugs removed the entire time? Have the gas all the way pressed? (Not sure how that works on the DBW car).
Old 03-23-2013, 01:04 PM
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Originally Posted by alexchannell
Did you pull the fuel injector plugs or EFI fuse? All spark plugs removed the entire time? Have the gas all the way pressed? (Not sure how that works on the DBW car).
yes i pulled the fuse and did 1 cylinder at a time and putting in the spark plug after finishing that cylinder. also had the gas pedal at WOT during cranking
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