Question about 1996 Ford Escort 4 Door
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.
1 of 2 things could be a burnt Valve or your head gascet is faulty, It can also be a sticky valve so the valve stays open. Best advice is to remove your head to see.
Posted on Dec 08, 2008
Compression loss is normally caused by the valve seats being worn.
Other causes are piston ring(s) worn or broken or a head gasket leakage.
Posted on Dec 08, 2008
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Posted on Jan 02, 2017
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