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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  • 233 Answers

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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Posted on Jan 02, 2017

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I have a Daewoo lanos 1500 98 and firing very weak on 3. ive changed distributer, leads, plugs, what can I look for next?


You may have a failed or clogged fuel injector (if it uses multi-port injection) or that particular cylinder may have low compression because of a burned valve or bad piston rings. Have both the injectors and the compression tested and be sure a full leak-down compression test is performed.

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My 5.3 02 silverado has low compression and is miss firing


Any engine that has low compression indicates worn internal parts. $$$$ The usual suspects are worn piston rings. Have you checked all 8 cylinders? If so, are they all losing compression, or just certain cylinders? If you have access to a garage, do a compression check on all 8, you may also want to get a cylinder leakdown test, again, on all 8 cylinders. You can then decide what course of action would be best. Good Luch!

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Check Engine Light on Yr2001 Ford Escape V-6 2wd. Code says: Misfire on cylinder #5. Dealer said compression is low in cylinder #5. This Escape needs to pass smog. What can we do?


If the engine has a P0305 DTC (Data Trouble Code) for a "cylinder 5 mis-fire detected", then the first thing to do is to do a compression test to determine if the mis-fire is actually being caused by a mechanical problem, or an electronic problem.

If the engine really does have low compression on the #5 cylinder then that is caused by a mechanical mis-fire and nothing electronic will repair it, and the most common causes for a mechanical mis-fire would be a burnt or bent intake or exhaust valve, a warped cylinder head or damaged head gasket, or a damaged piston. You can call around and find a repair shop that will do a "compression leak down test" if you want to know exactly what is causing the compression leak without any dis-assembly to the engine.

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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?


The fact that it needed water and you know have you no fire on a cylinder means you prabably blew a head gasket. Does it blow out steam when you start it from cold now. You will need to check compression on all cylinders and do a chemical block test for fuel in the coolant first in order to rule this out or in.

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#2 and #5 cylinder has no compresion


try putting in 1/2 once of oil in #2and#5 turn engine over for 2 seconds then hook up the compression gauge and check compression if there is then the cylinders got wash out if compression doesnt come up you have broke the spring or bent the valve.

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1 Answer

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'
Onyer~EDson(:0)~[><U.K.

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