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LOW COMPRESSION ON CYLINDER 3
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Jamesleandre
User
Nov 15, 2012, 10:35 AM
Post #1 of 10
(4164 views)
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LOW COMPRESSION ON CYLINDER 3
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Year of car: 1992
Make of vehicle: Saturn
Model: SL2
Engine size: 1.9L DOHC
Mileage: 123,000
16 valve engine
How is everyone doing today?
The spark plugs on cylinder 3, on a 1992 Saturn SL2 1.9L DOHC KEEP FOUILING OUT. At first I thought is was the valve cover gasket, so I changed the valve cover gasket. It still keep on fouling out, so I did a
Wet and dry compression test. All the cylinders had 180 psi, but cylinder 3 had 28 psi. I bought the head gasket set and standard size piston rings. As soon as I took the heads off, I saw that the 2 exhaust valve on cylinder 3 was fool of carbon deposits, not closed all the way, and burned. So my main question is should I just fix the head, or should I go ahead and change the piston rings also since I already bought them?
The standard size piston rings are returnable. your advice is greatly appreciated.
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 15, 2012, 11:26 AM
Post #2 of 10
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Re: LOW COMPRESSION ON CYLINDER 3
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There is a lot more to rebuilding a block than just piston rings. I wouldn't touch the block. Just send the head out.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Discretesignals
Ultimate Carjunky
/ Moderator
Nov 15, 2012, 11:38 AM
Post #3 of 10
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Re: LOW COMPRESSION ON CYLINDER 3
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I agree. Don't mess with the rings unless you plan on taking the whole bottom end apart and having the block machined.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Jamesleandre
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Nov 15, 2012, 11:57 AM
Post #4 of 10
(4119 views)
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Re: LOW COMPRESSION ON CYLINDER 3
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Thanks guys for the advice
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autoguy85
New User
Nov 15, 2012, 4:58 PM
Post #5 of 10
(4093 views)
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Re: LOW COMPRESSION ON CYLINDER 3
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Also check for bent valve, sticky valve, or bent rod.
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saturn tech
User
Nov 15, 2012, 7:20 PM
Post #7 of 10
(4069 views)
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Re: LOW COMPRESSION ON CYLINDER 3
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The reason that valve has so much carbon on it is because of all the oil you are burning, the oil control rings and the compression rings are stuck in the piston, you need to replace the rings and clean the pistons
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Discretesignals
Ultimate Carjunky
/ Moderator
Nov 15, 2012, 7:51 PM
Post #8 of 10
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Re: LOW COMPRESSION ON CYLINDER 3
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I agree with Saturn tech on this one. Time to tear down the engine, hone out the cylinders, and put new rings in.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Discretesignals
Ultimate Carjunky
/ Moderator
Nov 15, 2012, 9:07 PM
Post #10 of 10
(4046 views)
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Re: LOW COMPRESSION ON CYLINDER 3
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I guess I did do a Mit Robbedme. I guess the other 47% of the time it doesn't matter.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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