Question about 1989 Oldsmobile Cutlass Ciera

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I lost compression in one cylinder an it is the # 2 cylinder

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  • Bruce Hathcock May 11, 2010

    You have a bent valve or a broken piston ring, to check pull the plug out, remove air cleaner and engine oil filler plug so you can here air leaking. Get the cylinder to top dead center put air in the cylinder, if you hear air from the exhaust pipe you have a bad exhaust valve if you here it coming out of the air cleaner it will be the intake valve and if you here it coming out the crank case vent then it's the rings that are bad, Please rate if this helped

  • honeymokey
    honeymokey May 11, 2010

    what engine?

  • Marvin
    Marvin May 11, 2010

    time to tear the engine down, what did you think yu had to do?



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Lost of compression is due to either leaking head gasket, valves not closing and seal properly or piston rings are worn and need replacing. One can tell if you have bad head gasket, oils contaminated by water when looking at dip stick, bad valves cause some smoke and run rough, worn piston rings will cause lots of blow-by and will cause white smoke heavily and also runs rough. Being 1968 original motor and never have been rebuilt will probably have over 100k mile will be needing tear down and rebuilt. Rebuilt it correctly will get another 100k plus. being 1968, doing your head and valves job or replacing head gasket if that is the problems and you can get by it. worn rings, I would rebuilt it completely instead repairing one or two cylinder unless you plan to get rid of it.

Posted on Aug 07, 2009


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there on?
my guess is cell phone typo, ??
why is there NO, compression,?
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2: bad valves on #1
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4: cracked head at #1
5: broken piston rod #1
6: compression gauge bad, you didnt post all 4 cylinders so......?????
7: flat cam lobe on cam for #1
8: broken valve spring #1 or keep lost.
9: valve lash wrong #1, or never set at 60k service. or the screw and nut for it fell off.
10: rocker, broken.
or worse.
if you need more guessing i can do it.

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