Misfire Detected?

Question

Driving my 2001 Impala the check engine lite came on. Took it to my Auto Part store and they put it on the computer. I got P0304 Cylinder 4 Misfire Detected what does this mean???

Answer 1

A misfire code can be set for a few different reasons, all of which should be diagnosed, because chasing parts down will get expensive. It could be a bad spark plug, a bad spark plug wire, a bad ignition coil, a bad fuel injector, a loss of compression on the cylinder due to mechanical failure, a blown head gasket, a leaking intake gasket, etc. I had a call on a claim for a 3.4 engine last week that had a misfire on cylinder 4, and they found 43 lbs compression. When they removed the valve cover, they found the rocker arm and stud laying in the head. The stud had actually pulled right up out of the head and stripped away the threads in the aluminum casting. It could be anything causing from something very easy to fix, or something very expensive. I would get it diagnosed properly. Good luck.

Answer 2

the previous are good solutions, i latterly ran for the era of an Olds. that had some comparable codes/overall performance. became out that the secondary winding on between the coils exchange into shorted (this is undesirable). they're often elementary to get entry to/examine. in case you have a multi-meter, or have a buddy that does, use it to income the resistance on your coils. common winding could have very low resistance somethin like .3 to a million ohm. The secondary winding desires to have a lot bigger resistance someplace interior the nieghborhood of 20K ohms. This varies from vehicle to vehicle, however the stages are ideal, common, examine interior the ohm variety, secondary, examine interior the kilo-ohm variety. If there is an open interior the common winding this is undesirable, a short interior the secondary, like no be counted if that's showing below 8k ohms resistance, this is undesirable (it will be obtrusive). additionally, the difficulty codes at the instant are not constantly precise to the cylinder numbers, so examine all coils. (i'm uncertain what proportion are on there, if that's a 4 cyl. possibly purely 2, yet i'm uncertain) If i would be of added tips, be at liberty to touch me, good success, Scott

Answer 3

THERE ARE SEVERAL POSSIBILITIES REALLY, 1 BAD PLUGS, 2 BAD WIRE, 3 SHORT IN THE IGNITION, COIL OR SPARK PLUG WIRE, 4 CLOGGED FUEL FILTER, 5 VACUUM LEAK, 6 LOW OR UNEVEN CYLINDER COMPRESSION, 7 FUEL INJECTION OR CONTROL SYSTEM MALFUNCTION......HOPE THIS HELPS OUT GOOD LUCK

Answer 4

http://www.iatn.net/shopfinder/

don't know your location but this might find you an honest tech. or shop

Answer 5

http://www.aa1car.com/library/vacleak.htm

http://www.aa1car.com/trouble-codes/page2.htm