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Old 09-24-2010
2003Ranger's Avatar
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Join Date: Feb 2005
Location: South Lyon, Michigan
Posts: 657
2001 3 liter misfire 200k Miles NEED HELP ASAP

Started running a bit rough missing in the mid rpm range. I ran the code and it came up as 'random misfire' so i replaced the coil pack. After this it's at least idleing better, but still has a misfire at the mid rpm range.

Im thinking to believe its a bad injector, what are ways to test forsure if its the injector thats bad before i pull it? And how intense is the install of a new one? Average price of new(remanufactured) one?

Codes its thrown was-
Random Misfire Detected
Bank 1 Running Lean
Cylinder 1 & 3 Misfire

Something thats strange too is if I unplug cylinder 1 and/or 3 injector wire harness nothing changes in noise or idle. But as soon as cylinder 2 is unpluged it starts making all sorts of pinging or clanking noise......

If anybody can lead me in the correct direction that would be Greatly Appreciated.
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Old 09-25-2010
t3ob's Avatar
Join Date: Apr 2008
Location: Olive Branch, MS
Posts: 1,762
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Old 09-25-2010
Join Date: Sep 2010
Location: phoenix,az
Posts: 16
My 99 ranger 3.0 ltr did something similar. Make sure that you verify that the misfire is coming from one cylinder constantly. If so check spark and compression. If those are both good I would change the injector. After I replaced my injector the engine ran beautifully again.
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Old 09-25-2010
Alex98's Avatar
Join Date: Jul 2007
Location: Baltimore, Maryland
Posts: 844
plugs and wires? have you checked them?
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Old 09-25-2010
marc83's Avatar
Join Date: Sep 2009
Location: Tyler,TX
Posts: 407
Mine did the same thing and after replacing the plugs, wires, coil pack I cleared the code out move the injector for the cylinder that was miss firing and when it came back I replaced the injector that the miss fire moved to. For me I had a miss fire on Cyl. #5 so I moved the injector from #5 to #3 and then drove it for a day. When the light came on it had moved to cyl. #3. Seeing as you have a miss fire on cyl. #1 and #3 I would move #3 to #5 and #1 to #2. It's not hard to do and takes about 30mins to an hour to take apart and put back together. You can PM me if you need help
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