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Old 02-26-2012, 02:28 PM
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Rough idle. Possible CPS?

My truck has a rough idle and has been noticed for a few months now. I didn't really think much of it at first but now it almost sounds like its cammed. Just wondering if it could be the cps or something else. Haven't really noticed any loss of power and turbo seems to spool up fine (don't have gauges currently)

And before anyone starts anything claiming its my regulated return I built, it was doing the same thing before that build. I know there were a few that frowned upon my build thread.

Looking for any tips and opinions. Thanks!

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Old 02-27-2012, 02:57 PM
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Anything? I've searched through cps problems and rough idles but nothing really seemed to match what mines doing...

I wish I could get my hands on a good scanner tool cause everyone around here wants to charge an arm and a leg just to pull codes

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Old 02-27-2012, 03:17 PM
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Its highly possible. You might want to look at getting a scanner on it to see whats going on. Do you have any links to your regulated return? I've been looking to do the same on my truck. Thanks!
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Old 02-27-2012, 04:14 PM
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Second vote for a scanner. You need to read contribution percentages. I would also get a fuel pressure gauge immediately. You could be heating up your pistons from lack of fuel pressure. Bad news bears.
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Old 03-05-2012, 01:36 PM
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Got the new CPS on, used the grey IH one. Helped a lot.. also got my fuel pressure gauge on, and it wasn't reading anything. And still had a small "lope" in the idle. Turns out I put the fuel lines on the wrong side got em switched around and pressure was set about 78. Dropped it down to about 65 and it idles great! Thanks for the input though. Also going to look into getting an IPR rebuild kit soon from ford.

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