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ch4ngv
Dodge Dakota
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6/24/2008
17:12:54
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 Subject: P0300,P0304,P0308 Codes
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2000 4.7 5 speed manual.
I've had these codes popping up for the last 6 months. Engine mis-fire, cyl 4 and cyl 8. I can clear them with my scanner but a couple of days later they're back.
In the spring I thought a plug change would fix it as it was due. Nope they came back.
Then I tried swapping coils 4 and 6 thinking if it was the coil I should now see P0306. Nope. P0304 and P0308 with occasional P0300.
Recently I was using a Scan Gauge 2 and when the PCM switched from open loop to closed loop the CEL came on. Sure enough P0304 and P0308.
I've looked at the wiring and it looks OK.
I tried dielectric grease on the coil connectors as well.
Has anyone else with a 4.7 5 speed had this issue?
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Lee
Dodge Dakota
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6/24/2008
18:12:38
| RE: P0300,P0304,P0308 Codes
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I worked on a friend's Ford Ranger V6 when its CEL came on. The code was Cylinder #1 misfire. The truck also acted like it was only running on 5 cylinders. I tried spark plugs, wires, etc. with no luck. We then checked the resistance on the fuel injector for that cylinder. It was OPEN. Replaced the fuel injector (~$70), cleared the code, and all was well. See what the spec is for your fuel injectors, then measure all of them to see what you get. Something to try!
Lee
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RadioMan
Dodge Dakota
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6/25/2008
07:29:57
|  RE: P0300,P0304,P0308 Codes
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ch4ngv, I think what Lee told you is VERY good
advice!
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ch4ngv
Dodge Dakota
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6/25/2008
10:08:09
| RE: P0300,P0304,P0308 Codes
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That is good advice.
Are 4.7 injectors low impedance or high?
I'm at work and my FSM is at home.
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ch4ngv
Dodge Dakota
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6/26/2008
22:36:45
| RE: P0300,P0304,P0308 Codes
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Injectors are 12.6 ohms +/- 1.2 ohms.
Haven't checked mine yet.
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ch4ngv
Dodge Dakota
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7/03/2008
18:12:54
| RE: P0300,P0304,P0308 Codes
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Cyl 4 = 15.6 ohms @ 80 degF
Cyl 8 = 14.6 ohms @ 80 degF
Cyl 6 = 15.6 ohms @ 80 degF
Added dielectric grease when the connectors were reinstalled.
As cyl 6 is the same as cyl 4 I dont think the misfire CEL is caused by the injectors.
Problem still persists.
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