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1999 trooper engine code P0303 Misfire

07-18-2011, 12:36 PM
I got this code on Friday. P0303 Cylinder 3 MisFire. Saturday i changed the spark plugs and when i started it the code was gone. I drove my trooper to work today and it was still off. Now it has come back on. I have looked it up and this could be a number of things. I dont want to go on a wild goose chase so i was hoping someone has run into this. Should i start by replacing the Coil pack on cylinder 3? Thanks for any help:biggrin:

08-03-2011, 08:12 PM
Try swapping the coil pack with another cylinder (but not #6) and see if the code follows the coil (ie, error code changes to indicate the new cylinder).

08-03-2011, 09:04 PM
Also check the injector wire going to cylinder 3.

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