Chasing idle issue - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 14 (permalink) Old 04-23-2017, 02:28 AM Thread Starter
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Chasing idle issue

I've been trying to chase down a idle issue for a good while now. Randomly at idle the truck will bounce and/or the idle will jump 100-150 rpms get to the next light and it won't do it it is really random. Today I just so happened to have AE up and at a light it started acting up icp pressure was around 580 with ipr duty cycle at 12% truck was not warmed up yet. The thing is I noticed the duty cycle was jumping up .5-1%. Is this normal? When my truck is fully warmed up it holds a perfectly steady duty cycle. Not sure if this would be a icp or ipr issue or if I need to look else where.
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post #2 of 14 (permalink) Old 04-27-2017, 10:17 PM Thread Starter
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Re: Chasing idle issue

Did some poking around today with a multi meter thinking maybe electrical issue. Should both batteries read the same voltage with the truck running and with the truck off? With it running my driver side battery barley gets 13 volts with the truck off it is mid 11s. While the passenger side is outing out a little over 14 running and around 12 off.
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post #3 of 14 (permalink) Old 04-28-2017, 01:04 AM
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Re: Chasing idle issue

LOAD test the batteries.
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post #4 of 14 (permalink) Old 04-28-2017, 02:03 AM
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Re: Chasing idle issue

Along with the load test you should have the same voltage at both batteries since they are wired in parallel. A difference is voltage when running points to bad cables.

I doubt that it has anything to do with your idle problem.

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post #5 of 14 (permalink) Old 04-28-2017, 12:52 PM Thread Starter
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Re: Chasing idle issue

Going to go through and clean all connections today. Really wish I could find the idle issue the truck was at a shop for over a month and they only got it to act up once even then couldn't track down the cause.
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post #6 of 14 (permalink) Old 04-28-2017, 01:02 PM
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Re: Chasing idle issue

Check your ICP and see if it is full of oil, the wiring pigtail may also be full of oil

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post #7 of 14 (permalink) Old 04-28-2017, 04:44 PM Thread Starter
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Re: Chasing idle issue

I unplugged the icp this morning bone dry I drove with it unplugged couldn't tell if it did much of a difference audibly I could tell the truck ran different and I usually have a shutter between 1500 and 2000 rpms when it is cold that wasn't there. Other than that unplugging it didn't do much else besides burn out my ses light haha. The problem is so intermittent it's hard to know when it's going to do it.
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post #8 of 14 (permalink) Old 04-29-2017, 03:55 PM Thread Starter
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Re: Chasing idle issue

Any other signs of a failing icp other than oil in the plug?
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post #9 of 14 (permalink) Old 04-29-2017, 09:06 PM
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Re: Chasing idle issue

Not saying this is the problem as I don't see how it relates ICP. But it has aided in smoothing out idle in some instances. That's to clean the fuel return stainless screen in the fuel regulator on driver's side of the fuel filter canister. Q-tips and a small mirror are needed, drain a little fuel out, pull the fuel filter. Using mirror and Q-tips inspect and clean the screen in the small hole about a 1/3 way down the driver's side of the fuel filter canister. You should get a bunch of blackish material off the screen using Diesel dipped Q-tips, once clean you should clearly see the shiny Stainless screen at the back end of the hole. Reinstall filter fire up and enjoy a smoother idle, if it was dirty. Try it and see if it makes a difference.

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post #10 of 14 (permalink) Old 04-30-2017, 11:56 AM Thread Starter
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Re: Chasing idle issue

I did that a few months ago when I put a new filter in but I'll give it another go. I'm up for anything right now
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