cylinder 3 misfire 04 colorado

10

Asked by Mar 31, 2016 at 07:21 AM about the 2004 Chevrolet Colorado Z71 LS Crew Cab 4WD

Question type: Maintenance & Repair

I changed all my spark plugs and put brand new coil packs on it also. now my
code is reading cylinder 3 misfire.

4 Answers

81,795

P0303 CHEVROLET - Cylinder 3 Misfire Detected... Possible causes... - Faulty spark plug 3 - Clogged or faulty fuel injector 3 - Faulty ignition coil 3 - Fuel injector 3 harness is open or shorted - Fuel injector 3 circuit poor electrical connection - Ignition coil 3 harness is open or shorted - Ignition coil 3 circuit poor electrical connection - Insufficient cylinder 3 compression - Incorrect fuel pressure - Intake air leak.... The P0303 code means that the cylinder 3 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 3. If the problem persist more tests needs to be done to diagnose problem,

2 people found this helpful.

Changed​ #3 fuel injector still having open circuit​, but engine still having open circuit problem!

Head issue. Very common problem with these trucks. Valve seat wear and you lose compression. Causes rough Idle and stalling. code reads as misfire but Head will need to be replaced.

Im having the same problem changed all the spark plugs and my psi did compression test and psi is low and is reading #3 cylinder misfire

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