01 F450 7.3 rough idle - Ford Powerstroke Diesel Forum
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Old 12-16-2012, 04:49 PM
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01 F450 7.3 rough idle

01 7.3 with 342000 miles. Has a rough idle, worse when cold. Runs good off idle.
Already replaced HPOP, ICP, IPR, UCVG with injector harness, 8 Injectors, reworked heads w/cups, PCM, Glow Plugs, new oil change and fuel filter.
I haven't checked the fuel pressure or volume yet. The engine was started with the fuel filter cap off, by mistake, engine ran and accelerated but made a mess. I think that would rule out fuel delivery.
PCM was replaced because it was back feeding 10 volts to the IPR. I had voltage on both sides of the IPR connector
The #8 injector is in the #7 cylinder. I haven't had a chance to change it yet.

Can the #8 injector scenario cause the rough Idle? Is there a way to test the IDM? What am I missing?
All advice is welcome and appreciated.
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Old 12-16-2012, 05:16 PM
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You likely just forgot to mention it but have you tried a CPS or what color is yours?
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Old 12-16-2012, 05:34 PM
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Sorry. On my 3rd cps with no change.
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