Rough idle. Possible CPS? - Ford Powerstroke Diesel Forum
 
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post #1 of 5 Old 02-26-2012, 03:28 PM Thread Starter
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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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Cody Ryan
03 f250 ccsb fx4 7.3
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post #2 of 5 Old 02-27-2012, 03:57 PM Thread Starter
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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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6637 intake, straight pipe
full RR w/ fuel bowl delete.
rebuild coming soon
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post #3 of 5 Old 02-27-2012, 04:17 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!

Allen
1999.5 F-350 7.3, six-speed
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post #4 of 5 Old 02-27-2012, 05:14 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.

Nonconformist. Functionality over bling.

My three rules for 7.3l troubleshooting: 1) Replace CPS and keep a spare. 2) Replace FPR and know your fuel pressure. 3) Hook it to a scanner and check for codes.
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post #5 of 5 Old 03-05-2012, 02:36 PM Thread Starter
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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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Cody Ryan
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6637 intake, straight pipe
full RR w/ fuel bowl delete.
rebuild coming soon
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