Question about 1993 GMC Suburban

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1993 cevr c 1500 sub low compresion in cylinder 5

The cylinder fires but low compression in hole 5.

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  • nicco48 Oct 09, 2009

    thats what i had a fellin it was going to take



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There are a few things it could be. compression rings around the piston, bent exhaust valve, or bad exhaust valve or seat, or bad head gasket. I would start with cylinder leak down test, that will rule out a couple of those. Depending on mileage, the more common seen on high mileage chev are worn rings.

Posted on Oct 09, 2009


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Low compresion on one cylinder on 2.5 taureg

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Engine overheated & shut down i let it cool down for 12 hrs. bled fuel system added water installed new coil engine turns over freely but no fire on 3 cylinders?

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#2 and #5 cylinder has no compresion

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1993 nh pajero 3 LTR running on 5 CYL

Hi Roy,
You say you have compression? is it well within the range of the other cylinders? if it is i.e. around 100 psi then possible bent or sticking valve? although you have a spark when plug earthed out of head is there possibly some foreign matter isolating the plug or is it the plug itself breaking/tracking down when in situe?
Failing all these, try a small amount of fuel direct into the cylinder to see if it fires briefly (Not too much just a couple of mls)
Maybe possible Head gasket failure? (I doubt it as all other cyls fine)
Can't think of anything else I would try,
Hope this helps!
Paul 'W'

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