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Old 10-25-2009, 07:37 PM Fanatic

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Need Help

Ok just ran my truck and got six codes back and ive fount out what they mean to what im wanting to know is if someone can more clearly define them for me and also tell me if they think this could be contributing to why my truck is running like it is . heres what ive done so far. It runs hard when i first start it but after it warms up it runs fine or if i plug it in for about 2 hours it does fine to. So i thought i need to replace the glow plugs so i did and also replaced the glow plug relay and still i have the same problem and have also replaced the fuel fileter. but heres the codes that came up.

P0344- CMP Sensor Circuit intermittent
P0476- Exhust pressure control valve proformance
P0541- manifold intake air heater
P1280- ICP circuit out of rancge low
P1316- Injector circuit/ idm codes detected
P1670- EF feedback signal not detected

Thanks for any help, Evan
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Old 10-27-2009, 10:46 AM Fanatic

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Anyone got a clue?
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Old 10-27-2009, 11:58 AM
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Man that's a whole slew of codes. Sometimes if you do a lot of cranking or I guess even if the truck is running poorly it will set the CMP and ICP codes.

The exhaust pressure code is pretty common and not typically something to worry about.

The injector circuit/IDM codes could be from a bad/burnt wire harness at the valve cover.

I think if I had to guess what's going on based off your symptons and codes I'd say you have a valve cover wire harness issue. The outer pins that run the glow plugs have probably melted the connector either on the inside or out. Once it melts so far it starts creating resistance in the ajacent wires that run the injectors. This in turn makes it run rough which messes with the CMP reading and possibly the ICP sensor.

Try clearing the codes if you haven't already and see what comes back. It's possible a couple of them were set a long time ago and just never went away. This way you can see what codes come back from your current issues.
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