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Troubleshooting bad exhaust valve

(1990 Mercedes-Benz 300CE)
in San Jose, CA on March 16, 2016
Wont pass smog.
Compression check compressions are 75lbs, 135 lbs, 190lbs, 175lbs, 160lbs and 185 lbs
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Popular Answer
on March 16, 2016
Google > cylinder leak down test .. Also can be air checked.
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