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not so good compression test

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Old Aug 8, 2011 | 12:47 PM
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negusjuda's Avatar
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From: wilkes-barre , pa
Default not so good compression test

so i decided to do a compression test today because for the past 2 days my car on start-up would idle funny for a few seconds when i did it my numbers where starting from cylinder 1 200-225-225-235 not sure as to why cylinder 1 is only 200 im hoping i didn't over rev and maybe had p2v issues.
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Old Aug 8, 2011 | 12:51 PM
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00Red_SiR's Avatar
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Default Re: not so good compression test

put a little bit of oil in that cylinder and see how much of a difference it makes. If it's a bent valve, the number shouldn't really change much.
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Old Aug 8, 2011 | 01:07 PM
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Default Re: not so good compression test

Originally Posted by negusjuda
so i decided to do a compression test today because for the past 2 days my car on start-up would idle funny for a few seconds when i did it my numbers where starting from cylinder 1 200-225-225-235 not sure as to why cylinder 1 is only 200 im hoping i didn't over rev and maybe had p2v issues.
Those aren't bad.. you want within 10-15% of each other..

How did you perform the test...?
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Old Aug 8, 2011 | 01:49 PM
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Default Re: not so good compression test

Originally Posted by ALL M0T0R
Those aren't bad.. you want within 10-15% of each other..

How did you perform the test...?
ummm i took all the spark plugs out right after i was driving it pulled ecu fuse and foot on gas wide open throttle and i did the test twice
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Old Aug 8, 2011 | 01:51 PM
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Default Re: not so good compression test

also i didnt think it was horrible numbers but just didn't expect number one cylinder to be that low i mean it dosent smoke valve train is a bit loud but besides how it idles when i first start it which actually just started a few days ago it dosent really run bad at all
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Old Aug 8, 2011 | 02:08 PM
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Default Re: not so good compression test

Hows your valvelash on cylinder 1 compared to the others?
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Old Aug 8, 2011 | 02:09 PM
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Default Re: not so good compression test

Originally Posted by PyroProblem
Hows your valvelash on cylinder 1 compared to the others?
this im gonna have to check next i just hit 1500 miles so its time to readjust the valves again
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Old Aug 8, 2011 | 02:44 PM
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Default Re: not so good compression test

Make sure the valvelash on all the cyls is correct.

You need to do the test evenly. Usually 15 secs is long enough between each cyl..
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