Question about 1996 Chevrolet Cavalier

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Low compression in 2 cylinders

I have a 98 Cavalier with a 2200 motor and it just started skipping all of a sudden and i thought it might have been a coil pack so i changed both, still did it, changed the wires and plugs, still did it so i went do to the local garage and got it put on the computer.... it said there was a problem with the injector so i thought i found it because when i pulled the plug off the #4 injector it didn't make a difference in the cars rough idling so i changed the injector....still did it so i though it might be a valve so i did a compression test and cylinders 1 and 2 had 174 psi in them so i tried cylinders 3 and 4 and they both had 124 psi????? think it might be a head gasket but people say when it goes between cylinders its usually around 70 psi??? any ideas lol

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Also check for cracked block ... not common but does happen

Posted on Mar 16, 2009

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Not the difference shoulD NOT be more than 10psi and some may say 20 psi. I SAY 10psi between each cylinder if this is 50 psi difference then you have at least a head gasket problem. But when you remove head have it check by a machine shop for cracks and warpage in head. Good luck and thanks for using FIX YA.

Posted on Feb 22, 2009

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A mechanic doesn't know why the motor
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Wouldn't you conclude that person has no
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Obviously you have bad valves or a failed head gasket,
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Seldom do you find actual compression values

That is sort of learned from experience & possibly
on a data base at a repair shop

If the compression is low then a valve problem or timing
belt would be where you start your checking

I would skip compression in all cases & go to cylinder leak down
test
Now you got a good mechanical idea on intake & exhaust valves
& more.

Those values as well as compression are gauged between cyl
for comparison

There is no need to do either at first

If you had repair shop tools you do a cylinder comparison
right off the battery cables just cranking the motor with the
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If there is low compression in one cylinder the fault wil be shown more at IDLING as the engine will not be smooth. So there will be reduced power and it might also skip.
In th long run you will have reduced power of the engine even as the engine will not show on higher RPM and thus the fuel useage will be more.
It will be good to check out and estimate to get the compression corrected to all cylinders.

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It sounds like you have a valve that may have dropped and is hitting the piston. It may be best if you remove the head and see what is going on. You may see the problem before you even get the head off.

You could also do a compression test to see if you have low compression on one or more cylinders.

Please post your progress

Thanks,

Tim

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