High idle to low idle - Ford Powerstroke Diesel Forum

 
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post #1 of 9 Old 05-04-2013, 11:12 PM Thread Starter
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High idle to low idle

So when my truck is sitting in park the truck will idle normal. Normal obs lope then to a little rougher lope. Only like a 75-125rpm drop. Nothing dramatic. But the further back you stand the difference is more noticeable. What could this be? Kinda annoying when just sitting... at an idle in park. Does it more at proper temp. But still will do it cold if sits long enough. Any idea what would cause this? Is it something I should be concerned about? Both my OBS do it. You can hear the motor start whirling right before it changes idle. Could this be a cps issue? Throttle position sensor? Or is it more mechanical then that?

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Last edited by Jerzyperson; 05-05-2013 at 09:04 AM.
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post #2 of 9 Old 05-05-2013, 09:04 AM Thread Starter
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Bump

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post #3 of 9 Old 05-05-2013, 09:40 AM
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My RPM at idle has a little flux too. I think I have heard the IDM mod helps smooth out the idle.

Gerry

'97 CCSB f-250 4x4 auto, 6pos chip w/ canned tunes, AFE intake, 4 in exhaust, 3in dp, 3.55 gears,
Dana 60 rebuilt and waiting to be installed
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post #4 of 9 Old 05-05-2013, 10:07 AM Thread Starter
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I was curious about that.
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post #5 of 9 Old 05-05-2013, 10:14 AM
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I think its in the IPR, or the oil. My truck did it horribly when i put the new engine in, until i changed the oil. It sucked draining all that oil with only 3-4 hours of run time and maybe 50 miles, but it ran waaaay better once i got my good stuff in it.

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97 F-250 ECLB 7.3/E4OD/4wd, 216k miles: FFD 250/200%'s, stock turbo, built trans, e-fuel, Swamps IDM, shimmed 910's, Melling LPOP, welded cam gear/modified pick-up tube. Built and tuned by me

97 F-250 ECSB project truck:250/2's, Gen 3, S468, SD axles, studs/springs, ZF-6
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post #6 of 9 Old 05-05-2013, 10:32 AM Thread Starter
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I just did an oil change not too long ago. Prolly not even a thousand miles. I know it does burn oil but not horribly bad. I just had to add a little bit. Possibly added too much? Not going to lie I didn't notice it after my oil change. But like I said I'm not at the normal 3k change mark...
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post #7 of 9 Old 05-05-2013, 10:48 AM
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Could ICP or fuel pressure issues or maybe even CPS. Bet your ICP is oily.



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post #8 of 9 Old 05-05-2013, 11:17 AM Thread Starter
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I just checked them. Not oily.
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post #9 of 9 Old 05-05-2013, 11:20 AM Thread Starter
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Checked the icp. Not oily. And replaced the cps when I bought the truck..
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