My 1996 Escort Wagon with 116K miles and 1.9L, 5 Spd was running fine one day then the next it started bucking and idling rough. Hooked up my code scanner and retrieved a P0304 trouble code, "# 4 Cylinder Misfire". Replaced plugs and coil pack, wires were replaced a short time ago, no improvement. Obtained a compression tester and checked cylinders #1 - 160 psi, #2 - 150 psi, #3 - 157 psi, #4 - 0 psi, specifications called for 170 - 207 psi. Injected oil into cylinder #4 and ran test again, still "0". Checked radiator for combustion residue or smell and found no traces. Removed valve cover to explore claims of sticking valves due to carbon buildup. Area around rocker assembly on top of head looked like new, I use synthetic oil. When cranking engine all valves operated freely. Question arose about blown head gasket but, could it be that severe as not to show some residual pressure during compression test, I got "0" as mentioned above? My last resort is to consider removing oil pan to view piston from below for any possible cracks or holes in piston which would account for massive compression loss, confirm. I've worked on cars for a long time, but this one's got me confused, any help you can provide would be appreciated.
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was it running this way before you changed the plugs? just a shot in the dark here possibly a defective spark plug, rare but not impossible. if it was running fine before changing them. Other wise I would take it to autozone and pull codes if it is P0350 #5 misfire we would use the process fuel, fire and compression. is there any engine coolant around any cylinders? Have you checked the coil packs? could be a bad coil pack. if no evidence of fluid around them proceeded to check for spark, fuel then compression. post back results or new post with more deductions. iis it no spark no fuel or bad compression.
Determine what cylinder is misfiring and do a compression test on that cylinder. Compare it with a cylinder that is not misfiring. You should have no more than 20% difference between the good cylinder and the bad cylinder. If it is low on compression, suspect a burn valve or bad valve seat... and it will require cylinder head repair. If it is good on compression, then look for a faulty injector or some other reason for the misfire on the dead cylinder.
Hi there. Sorry i do not have a solution for this, however i wanted to see if you ever found one. We too have same veh with the except of it being an automatic, and are having the EXACT same issues you. Any info you have to direct us would be very much apprieated. Thank you.
I know this is going to sound stupid, but I've done it before, did you put he car in park? You might also want to try it in neutral also. If neither of these two tests work, you can try to jump across the solinoid on the fender well. Don't stand in front of the car, and make sure that the parking brake is set, just in case it starts and tries to run you down. If jumping across the two big posts cranks the motor, chances are either the solinoid or the electrical half of the ignition switch is bad.
i would suggest you remove the spark plug wire one at a time and if the car really miss bad take that plug out and screw in a compression tester and that will tell you if you have a bad head or not also make sure from auto zone or napa if you do not have a repair manuel what the compression should be