ENGINE IS RUNNING ROUGH

2004 Chevrolet Trailblazer

Tiny

Anonymous

November, 27, 2012 AT 3:25 PM

Engine is running rough. Did diagnostic and got the following codes. 301, 172, 485, 420 442, 526. 301 indicates cylinder 1 misfire. Have changed coils and plugs. Problem still exists. Any ideas? Is the cylinder 1 misfire causing the other codes?

FOUND 4487 RELATED QUESTIONS

Running Rough

27 ANSWERS
34 IMAGES

Idles Rough/changed Ects

37 ANSWERS
3 IMAGES

1 Answer

Tiny

racefan966

November, 27, 2012 AT 4:10 PM

Ok so you have P0172 which means it is running rich, then you have P0420 which is cat insuffient flow (this can cause a miss), P0442 is EVAP system leak, this could be anything from a bad gas cap to something wrong with the evap system, and P0526 has to do with the coolant fan speed problem. As for 485 I find no such code if it is 483 then again coolant fan system problems. Now the missing may be either an injector or something to do with the cat or one of the O2's and or the evap problem. So if you have a digital ohm meter ohm the number 1 injector and get back to me with the reading and we will go from there ok.

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