Question about 1982 Porsche 911
Misfire (not backfire) only at rpm greater that 4000 in my porsche 911 (1981). Seem to be worse when the engine is hot and well into operating temp.(not overheated)
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Posted on Jan 02, 2017
SOURCE: Hi, I have a 1997 Porsche
misfire :-------- try checking your 02 sensors /fuel pump and filter.
for 51 cylinder misfire :---
Change the coil. Period. Very easy to remove from the vehicle if it's a 4 cyl. Follow that spark plug wire from the spark plug to the other end. What it's attached to you should replace
for 54 cylinder 5 misfire :---First you have to eliminate the most obvious problems, like spark plug and spark plug wire. If you replace those and you still have a misfire, then it's a good idea to look for a vacuum leak in the intake manifold
Posted on Mar 07, 2009
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Dec 23, 2013 | Ford Ranger Cars & Trucks
Trouble Code: P0301
Cylinder No. 1, 2, 3 or 4 Misfire Detected
Trouble Code Conditions: Engine is running; atmospheric pressure, fuel level, battery voltage, engine speed, engine load are above minimal predetermined specifications; the engine is not in fuel cutoff and intake air temperature and coolant temperature are within normal operating ranges; there are no DTCs relating to ECT, CMP, CKP, MAP or IAT Sensor, to Crank rationality, to Crank Sensor Learn invalid, or to System Voltage. If total misfires detected are greater than 7% during the first 1000 rpm, or are over 3% after the first 1000 rpm, or are 25% during any 200 rpm with suspect cylinder misfire counter more than 80% and no other cylinder misfire counters above 80%, this DTC will set. The MIL will flash after first trip occurrence and will be steady after second trip.
Fuel system problems existErratic CMP or CKP Sensor signalsIgnition system problems existEngine mechanical problems existPCM has failed
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