I guess I will answer this myself in the hopes the next guy will not have to spend as much time searching theas 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)
Stop by http://www.coloradofans.com there are different people that have had that problem. you can probably message them personally and see how they got to that problem. P0300= Random/ multiple cylinder misfire detected P0301= Misfire detected- cylinder #1 P0302= Misfire detected- cylinder #2 P0303= Misfire detected- cylinder #3 P0304= Misfire detected- cylinder #4 p0305= Misfire detected- cylinder #5 P.S. These are Diagnostic trouble codes, not vechicle id numbers.
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