Irratic idle
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Irratic idle
I seached a bit w/o success. I have an 06 psd and all the sudden my idle is irratic and studders. I am at altitude as well about 6500ft. I am just hoping it does not leave me and the family stranded. The idle seems normal other than a semi frequent studder and the tach drops a little bit then back to normal. No lights on dash are showing any problems and temps seem ok. Anyone seen this before?
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Joined: Jun 2008
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From: Sarasota, fl
My very first guess would be ICP sensor problem, that's the #1 cause of idle issues. Usually it throws a DTC - even your check engine light's not on - a scanner would show the trouble code. Pull up to an autoparts store, they usually nice enough to pull DTC-s.
Post Fiend
Joined: Oct 2002
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In my case it was an injector issue, although it ran FINE like that for months.....
just a blip in the idle every once in a while.... no lites, no dtc's ....
I don't know where the ICP plug is to pull it, but maybe you might try that....
just a blip in the idle every once in a while.... no lites, no dtc's ....
I don't know where the ICP plug is to pull it, but maybe you might try that....
Jäger
Joined: Jan 2005
Posts: 5,491
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From: Northern Arizona
Mine did that for a month or two until the Fuel Injection Control Module (FICM), Fuel pump/HFCM, and the ICP sensor were replaced. Never threw a code.
KRDiesel said it, unplug the ICP sensor and see if it smoothes out.
KRDiesel said it, unplug the ICP sensor and see if it smoothes out.
Posting Guru
Joined: Feb 2009
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From: Moyock, NC
Mine was doing the same thing a few months back until the FICM failed and was replaced...now all conditions normal. Put a code reader on it and see what it tells you. If still under warranty it should be replaced with zero deductible $$...emmissions related...at least my dealer didn't charge me.
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From: Lakewood, Ca.
On an '06 it's on the passenger side valve cover.
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Jäger
Joined: Jan 2005
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From: Northern Arizona
Thanks Steve!
The ICP looks and functions like this: http://dan.prxy.org/Truck/6L_bible_h.../Page_061.html
The ICP looks and functions like this: http://dan.prxy.org/Truck/6L_bible_h.../Page_061.html
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Hmm, good advice so far. But this morning we went out and now the truck idles really rough all the time and there is no power. I mean, the thing barely moves even when the gas is floored.
I am stuck in Tahoe now with a $500 bill to tow it (even though we have the roadside assist program).
Any chance I can fix it myself? Do you all still think it's the FICM/ICP? I am going to go try to pull the ICP now... hopefully I can locate it. I think so based on what you guys posted..
Thanks a ton so far..
I am stuck in Tahoe now with a $500 bill to tow it (even though we have the roadside assist program).
Any chance I can fix it myself? Do you all still think it's the FICM/ICP? I am going to go try to pull the ICP now... hopefully I can locate it. I think so based on what you guys posted..
Thanks a ton so far..
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I just removed the ICP and restarted it. The idle was still rough/no power.
I put the ICP back in thinking it didn't help, but then the truck idle'd like it did yesterday with a rough spot every once in a while vs always rough. It had power again on accel.
The dealer won't be able to look at it for a couple days. If I think I can just replace a part I might have one overnighted here and fix it myself. Otherwise I might try to get it to run with power and head towards the dealer to try to save on towing expense.
Thoughts? (thanks again for everyone's help, you are amazing..)
I put the ICP back in thinking it didn't help, but then the truck idle'd like it did yesterday with a rough spot every once in a while vs always rough. It had power again on accel.
The dealer won't be able to look at it for a couple days. If I think I can just replace a part I might have one overnighted here and fix it myself. Otherwise I might try to get it to run with power and head towards the dealer to try to save on towing expense.
Thoughts? (thanks again for everyone's help, you are amazing..)
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I think I got it fixed.
I believe the total loss of power was simply low oil. I was about 3qts low. Hopefully others can learn from my mistake. I also disconnected the EGR valve, but I believe it was just low oil. I will reconnect it in the morning and see if that makes a difference, but I don't expect it will.
I think the idle was correctly diagnosed as the ICP as I played with it a bit more and now I believe that it idles better with it disconnected. I will take it to the dealer by my house and get it fixed w/o having to tow it.
Thanks for all the help here, hopefully others will find it later if they have similar problems.
I believe the total loss of power was simply low oil. I was about 3qts low. Hopefully others can learn from my mistake. I also disconnected the EGR valve, but I believe it was just low oil. I will reconnect it in the morning and see if that makes a difference, but I don't expect it will.
I think the idle was correctly diagnosed as the ICP as I played with it a bit more and now I believe that it idles better with it disconnected. I will take it to the dealer by my house and get it fixed w/o having to tow it.
Thanks for all the help here, hopefully others will find it later if they have similar problems.
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Yeah, I hope it didn't. I don't see any oil leaks other than some around the turbo (thats probably bad too).
Today my erratic idle returned. So it's back to square one. I was reading another thread that said it could be the EBP sensor. It's just curious to me that all these problems started when I hit altitude:
https://www.ford-trucks.com/forums/3...st-read-5.html
The total loss of power problem is gone (so far).
I now also seem to have a surge of power on steady throttle now as well. I am going to disconnect the EGR again and see if it helps.
Sheez, I am trying to be scientific as possible about this, but this thing is complicated.
Today my erratic idle returned. So it's back to square one. I was reading another thread that said it could be the EBP sensor. It's just curious to me that all these problems started when I hit altitude:
https://www.ford-trucks.com/forums/3...st-read-5.html
The total loss of power problem is gone (so far).
I now also seem to have a surge of power on steady throttle now as well. I am going to disconnect the EGR again and see if it helps.
Sheez, I am trying to be scientific as possible about this, but this thing is complicated.