Engine compression reading


Old 07-27-15, 09:17 PM
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Engine compression reading

What should the compression read for my 91 Grand Voyager when doing the compression test?
Its a 3.3 ,6 cylinder.
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Old 07-27-15, 09:51 PM
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I don't know the exact answer. I would guess between 175-225psi.
What's more important is how they compare to each other.
I believe they should be within 15% of each other.
Old 07-28-15, 04:53 AM
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Repair manuals specific to the vehicle usually have the specs for compression but like Pete said, the main thing to look for is how the different numbers compare between the cylinders. More than 20% difference can indicate a problem. Have you done the compression test? have the numbers? did you inspect the spark plugs as you removed them?

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