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Oldsmobile Forum: mis-firing after head cylinder job.no DTC
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Old February 17th, 2019
rabbani rabbani is offline
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mis-firing after head cylinder job.no DTC

my 2000 Oldsmobile Alero 3.4l v6.i just finish head cylinder re-surface machine it because coolant mixing with engine oil.did all the vacuum & leak test in the machine shop.put it back with all upper gasket include head-cylinder, exhaust, lower intake,upper intake.start it up and having mis-firing and rough idle,hard to start.compression check,leak down test,fuel pressure test.all f9.one thing i noticed when i did fuel injector test,when activating fuel injector with scanner there was no change on fuel pressure.fuel reads rich.no cam sensor signal no codes.
still scratching my head.any help?
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