hey guys,
its been a while since my car has run well, but now its not drivable. it started out as a cyl 4 misfire CEL and a rough idle back about 4 months ago. i replaced the spark plugs, and it went away for about two months. when the cyl 4 misfire CEL came back, i swapped the coil packs and the CEL followed it to cyl 2. replaced bad coil and it was okay for a month. about a month ago, i had an overheat, but i noticed it immediately and pulled over, let it cool for quite some time then limped it about a mile back to my house. that turned out to be a bad thermostat. then the cyl 4 misfire code came back immediately after replacing the thermostat, and the car was missing hard. while on the highway, the CEL started flashing, so i limped it home and parked it. turned out that cyl 1 was missing as well, due to a bad plug. i replaced that as well as my plug wires, but the car still runs terrible, like cyl 4 is not firing at all. i swapped injectors 3 and 4 but the misfire stays on cyl 4. a compression check shows ~190 psi accross the board with no change over a 30 sec interval. so good spark, good fuel, good compression... bad emissions? tonight i took out the egr valve and checked the resistance valves as prescribed by the service manual. all were supposed to read 24 ohms... all read 0 ohms, so bad egr. also, cyl 4 has carbon buildup on the plug, but thats to be expected with the missing.
i guess the point of all of this is: would a bad egr valve really cause such a bad issue with just cyl 4? anyone have similar issues?
sorry about the long post. any input would be greatly appreciated.
-kiel
its been a while since my car has run well, but now its not drivable. it started out as a cyl 4 misfire CEL and a rough idle back about 4 months ago. i replaced the spark plugs, and it went away for about two months. when the cyl 4 misfire CEL came back, i swapped the coil packs and the CEL followed it to cyl 2. replaced bad coil and it was okay for a month. about a month ago, i had an overheat, but i noticed it immediately and pulled over, let it cool for quite some time then limped it about a mile back to my house. that turned out to be a bad thermostat. then the cyl 4 misfire code came back immediately after replacing the thermostat, and the car was missing hard. while on the highway, the CEL started flashing, so i limped it home and parked it. turned out that cyl 1 was missing as well, due to a bad plug. i replaced that as well as my plug wires, but the car still runs terrible, like cyl 4 is not firing at all. i swapped injectors 3 and 4 but the misfire stays on cyl 4. a compression check shows ~190 psi accross the board with no change over a 30 sec interval. so good spark, good fuel, good compression... bad emissions? tonight i took out the egr valve and checked the resistance valves as prescribed by the service manual. all were supposed to read 24 ohms... all read 0 ohms, so bad egr. also, cyl 4 has carbon buildup on the plug, but thats to be expected with the missing.
i guess the point of all of this is: would a bad egr valve really cause such a bad issue with just cyl 4? anyone have similar issues?
sorry about the long post. any input would be greatly appreciated.
-kiel
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