1985_GT

Hey everyone, I've never posted on here because I知 usually able to find everything by searching the threads. But now I can't find any info and at the end of my rope! I have an 85 Coupe GT with a 2.2 I5 KX engine at 120k miles. It has a miss and runs rough through the rpm range. I've replaced cap, rotor, wires, plugs, distributor vacuum advance, ignition coil, vacuum lines and all five fuel injectors. fuel pressure is good and just today I got the engine up to operating temp and did a cylinder compression test with the following results: #1-110psi #2-105psi #3-105psi #4-110psi #5-95psi. So are these #'s normal? Any ideas? Thanks

x19

Well. your compression are lower than 120 psi and #5 is too low that I have to say. You better to do the cylinder leakage test ( 0 ~ 20% are Okay) before remove the cylinder head for the grinding valves and if you might hear air leakage from exhaust tail pipe, crank case (remove oil filler cap) or intake manifold (remove the one of vacuum port(s), one of this test didn't pass then you have to remove CH. #1 job of this kind misfiring problem is testing compression ! ! x19 I hope you already fixed.