I bought a 2000 jeep grand Cherokee with a missfire cyl 8 put coil, fuel injector,and plug in it. Still missing. Someone told me it could be a valve sticking, found out on the internet that you can put a piece of paper up to the tailpipe and if it tries to suck it up the pipe then your valve stuck. Tried that and sure enough and try to suck the paper up. I bought some valve doctor stuff, and put it in the crankcase also-ran seafoam, through the crankcase and intake. At this point when you first started the engine runs great and passes my paper check. Continues driving great until you shut the engine off for about 10 minutes then it misses again until the engine completely cools down, once cool when you start it runs fine.
Another issue is having is the oil pressure gauge drops to 0 after the engine run for a minute. I'm not sure if the gauges messed up or if it's really dropping, but I've drove it for 20 30 miles with no issues with the gauge reading zero. Any tips to getting a valve permanently freed up?
Another issue is having is the oil pressure gauge drops to 0 after the engine run for a minute. I'm not sure if the gauges messed up or if it's really dropping, but I've drove it for 20 30 miles with no issues with the gauge reading zero. Any tips to getting a valve permanently freed up?