What part needs replacing if you have a DTC code of P0303 which indicates cylinder 3 misfire?

Answer 1

I guess I will answer this myself in the hopes the next guy will not have to spend as much time searching the internet as I did. I found this article. http://www.obd-codes.com/trouble_codes/generic/p0303-cylinder-3-misfire-detected.php And on a forum one guy found that after a HEAVY rain water had somehow traveled between the cowl and hood on his truck and settled on the well for plug #3. A bit of compressed air solved his problem I hope I am that lucky. Ron There can be a multitude of reasons why any given cylinder is misfiring. Some of the most common include: Faulty spark plug wire - (to see if this is the problem, exchange spark plug wire with another cylinder- if the trouble code moves from cylinder three to the new cylinder, your spark plug wire is the culprit) Faulty spark plug - (remove spark plug and examine for damage, and/or carbon deposits which would keep the plug from sparking) Faulty/improperly connected coil pack - (test coil pack for proper function according to your repair manual) Faulty Fuel injector - (Remove fuel injector from misfiring cylinder and exchange it with another cylinders' injector; if the problem moves from one cylinder to the next with the fuel injector, you have found your culprit)