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  #1  
Old 02-28-2010, 01:41 AM
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Exclamation Misfire Cylinder 1,2,3,4 HELP!

Hi im new to the foum im looking for some help, my truck its a 2002 quad cab 4x4 4.7L it has a rough idle and the check engine light is on, when i accelerate the light starts flashing. Between 50-60 mph it starts jerkin and sputtering, when you rev it up it starts to back fire I scanned it and i came up misfire in cylinder 1,2,3,4. I talked to a mechanic, he scanned and said if i changed the spark plugs then that would probably solve my problem. I changed the spark plugs its still has a rough idle and still runs like crap. sometimes for a second it will kick in like it wants to run good. if someone out there could give me some advice on what this could be or how to narrow it down to find out what it could be i would really apreciate it thanks guys.
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Old 02-28-2010, 03:37 AM
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its definitly before your plugs and wires, all four wont go at the same time. sound like the distributor is going bad, i would start with new cap and rotor button about 25 bucks. could also be your distributor pickup which is about 45. hope thats helps
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Old 02-28-2010, 07:32 AM
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The 4.7 doesn't have a distributor . I would start looking at the wire harness . Sounds like the harness for the injectors or coil packs may not be plugged in all the way .
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Old 02-28-2010, 08:17 AM
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Quote:
Originally Posted by youdontknowme1229 View Post
its definitly before your plugs and wires, all four wont go at the same time. sound like the distributor is going bad, i would start with new cap and rotor button about 25 bucks. could also be your distributor pickup which is about 45. hope thats helps
The 4.7 has NONE of these parts. It uses a COP system. Have the fuel pressure and volume checked. You could have an EGR valve hanging open. If that's ok try running a can of Sea Foam through the intake as the 3.7/4.7 engines are prone to carbon buildup.
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Old 02-28-2010, 10:50 AM
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Originally Posted by Remerson228 View Post
The 4.7 has NONE of these parts. It uses a COP system. Have the fuel pressure and volume checked. You could have an EGR valve hanging open. If that's ok try running a can of Sea Foam through the intake as the 3.7/4.7 engines are prone to carbon buildup.
my mistake then I have a 07 so i went to checker auto parts web sit to see when type of ignition the 02 has and it listed distributor cap, and pickup as replacement parts. I just checked autozone online and its showing distributor less, so my mistake.
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Old 02-28-2010, 11:00 AM
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Even in '02 the 4.7 used a COP system. The only engine to use a conventional ignition system in '02 was the 5.9.
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Old 02-28-2010, 12:33 PM
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Yea i made sure all the coils were pluged in. not sure what it could be im thinking about changing the coils but it just doesnt make sense why 1,2,3,4 would all start misfiring. i ram sea foam threw it about 3 days ago i mixed a whole can of it with 16 gallons of gas, sense i have a misfire on 1/2 of the engine its sucking down gas like crazy.

Last edited by DetroitDodge1989; 02-28-2010 at 12:36 PM.
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Old 02-28-2010, 01:11 PM
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Instead of changing the coils, just swap the 4 coils on the misfiring cylinders with the 4 known good cylinders and see it if the misfire follows the suspected bad coils. I wouldn't rule out a PCM or cam timing problem either at this point.
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