- Moderator
- #1
So we have a 98 Buick Century beater car. Daughter runs it but doesn't pay attention to gauges, as well as doesn't apparently realize that H is not a good place for the needle to be...
Anyway, as a result, the heads warped badly, so I replaced them. Had a parts car sitting, motor was locked up but had coolant in it. These motors are notorious for broken cams, and all that. Took the heads off, seemed fine. Nope, one had a bent exhaust valve, #5. Pulled it back apart (foolishly assembled it...) and bought another head to put on. Ran good for a while, then it developed a shudder and now it trips cylinder #4 misfire. Took it apart, found oil in the intake runner, so though maybe just intake gasket troubles... New high end Felpro gaskets which have never been an issue before, still has #4 misfire. Compression test shows good, all cylinders are at about 150. I can hear a little bit of a ticking in the exhaust manifold which has the offending misfire, but if you take the oil cap off, which is directly over the offending cylinder, quiet there. Is there something funky going on with the exhaust valve?
Never really had one work me over like this, just about ready to swap the whole damn motor since I have a few available to me, down side is they are nearly twice the mileage on them as the one in the car now.
Anyway, as a result, the heads warped badly, so I replaced them. Had a parts car sitting, motor was locked up but had coolant in it. These motors are notorious for broken cams, and all that. Took the heads off, seemed fine. Nope, one had a bent exhaust valve, #5. Pulled it back apart (foolishly assembled it...) and bought another head to put on. Ran good for a while, then it developed a shudder and now it trips cylinder #4 misfire. Took it apart, found oil in the intake runner, so though maybe just intake gasket troubles... New high end Felpro gaskets which have never been an issue before, still has #4 misfire. Compression test shows good, all cylinders are at about 150. I can hear a little bit of a ticking in the exhaust manifold which has the offending misfire, but if you take the oil cap off, which is directly over the offending cylinder, quiet there. Is there something funky going on with the exhaust valve?
Never really had one work me over like this, just about ready to swap the whole damn motor since I have a few available to me, down side is they are nearly twice the mileage on them as the one in the car now.