Not sure what is at fault??? - Team Camaro Tech
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post #1 of 3 (permalink) Old Oct 4th, 16, 07:50 PM Thread Starter
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Not sure what is at fault???

I have a 2002 Monte Carlo 3.8L with 297K mi. It was having a #3 cylinder misfire problem. I swapped plugs wires and fuel injector. I even gutted the cat because I read that it could throw that code. When I did the transmission R&R I did a leak down compression test and that cylinder was weakest. the motor was apart so the leakage was undetermined. Got it back together and still had the code. noted leakage past valves and rings. Today I got the piston out and the rings were stuck all to some degree. gunk down the piston sides. The head gasget looked ok. Ipulled the valves and the head looks ok except for being gummed up valves were not sealing either. I am going to tak the head to the machine shop for a cleaning. I hope they find the fault.


Do you think the rings are the source of problem? I never heard of them getting stuck. They didn't damage the cylinder wall.


Thanks in advance.
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post #2 of 3 (permalink) Old Oct 4th, 16, 08:26 PM
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Re: Not sure what is at fault???

Used to see that on little old ladies lightly driven high milage Oldsmobiles back in the mid 60's to early 70's. After rebuilding a few engines like that, we started pouring a can of Blaster in the oil and having them drive it that way for a week or two. Most of the time, the Blaster dissolved the carbon deposits in the oil that was causing the rings to become stuck. One of the tell-tale signs was the starter dragging causing a hard start condition. After replacing many starters, cables, and batteries, we finally narrowed the problem down to the sticking rings scraping all the oil off of the cylinder walls, causing the starter drag problems. That was one of the few times that I have seen a "mechanic in a can" solve a problem.
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post #3 of 3 (permalink) Old Oct 6th, 16, 02:43 AM Thread Starter
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Re: Not sure what is at fault???

Thanks Dyno John


This repair is a lot of work I want to make sure I fixed the problem. Think I might try Zmax or some other micro lubricant. Dad used to use marvel mystery oil 30+ years ago. before I popped the piston out, I poured oil in those three cylinders and it didn't leak down. When I get the head back from the machine shop I guess I'll know for sure. I didn't think the rings would fail this way.

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