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Compression / car running bad

 
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Old 04-19-2012, 09:12 AM
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Compression / car running bad

Hey I did a compression check the other night. One of my cyl was at 150 psi while the rest were near 180-185. The car sputters at low rpms between take off and 3k, also at idle I can hear it..sounds like misfiring. If I floor it say in 3rd gear going 20 it will kind of bump a few times until I get the rpms up.

I know I need a new cat becauae I can hear it rattle, but wondeing if the compression being off will cause it to run bad even thigh it's not that far off
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Old 04-19-2012, 10:21 AM
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Re: Compression / car running bad

Don't stop after the compression test. Do a leak down as well. With both combined it should tell you a lot about the state of your engine.
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Old 04-19-2012, 03:11 PM
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Re: Compression / car running bad

any codes !? my did that turned out to be the map sensor and the egr solenoid... but you do have a bad drop on copression like the guy above me stated do a leak down test and find out where that compresion is going....
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Old 04-19-2012, 03:20 PM
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Re: Compression / car running bad

bad valve seals?
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Old 04-19-2012, 08:27 PM
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Re: Compression / car running bad

could be... but you wont know for sure where youre loosing it untill you do a leak down test.....DO A LEAKDOWN TEST!!!!
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