Slight miss at idle, slightly modulating RPM and a noticeable miss under hard accel - Ford Powerstroke Diesel Forum
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Old 07-16-2009, 09:36 AM
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Slight miss at idle, slightly modulating RPM and a noticeable miss under hard accel

I think I have a CPS and maybe a injector trying to die.

At idle the RPM's very +/-100 in a regular pattern, kind of a surge. Its slightly rough at idle as well and if I really put my foot in it a noticeable miss.

No odd color or smell to the exhaust or anything and its still getting 16MPG so I don't think it is a major engine problem.

It feels like someones pulled a plug wire on a gaser V8.

I am suspecting a injector not firing right for the miss and the CPS for the floating idle. Could CPS be the cause of all of it?...I guess it could be now that I think about it.

Thoughts?

Last edited by Mudbug63; 07-16-2009 at 11:26 AM.
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Old 07-16-2009, 09:49 AM
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Could be your ICP sensor. Unplug the connector and see if there is any oil in there
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Old 07-16-2009, 09:49 AM
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get a scanner on it and run a cylinder contribution test and see what it says before goin any further
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Old 07-16-2009, 10:39 AM
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Yep that's my next step...trying to track one down now....Ill shell out the cash for a AE unit if I can't find one local to borrow/rent/beg....

Last edited by Mudbug63; 07-16-2009 at 11:23 AM.
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