Engine Cylinder 3 misfire

brassman88 · Nov 15, 2012

I have a 97 with a 3.8. I replace plugs wires and coilpack then starting getting a misfire on 3 (p0303) after reading some forums such as this i thought it might be te injector. Injector replace and still a misfire on 3. Any other possible solutions???? I did read somewhere it could be the crank sensor. Any help would be greately appriciated

Noobz347 · Nov 15, 2012

Go down the list until you find the problem. My bet is on the coil pack or improperly seated plug wire.

Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer

greyfrankenstang · Jan 17, 2013

I had a cylinder 1 misfire a few months back.
Here's what i replaced to try and resolve the issue.
Spark plugs
Spark plug wires
Coil pack (dont use a pepboys one, it broke about 2 weeks after i got it. Go OEM)
Catalytic converter( both cats and pre cats)
Cam shaft synchronization position sensor array
Finally, i had to take it to a Ford repair place, and they informed me it was the injector.
I did check the compression, but that tested ok.

I see you replaced the injector first, so try my list if not noobz347. I'm curious what the culprit is on your car, so let me know when you find out.

brassman88 · Jan 18, 2013

Thanks for the help i resolved my issue.....it ended up being a bad wire. I replaced the wires again and no more problems.

Engine Cylinder 3 misfire

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Engine Cylinder 3 misfire

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