IPR?
Thread Starter
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Laughing Gas
Joined: Jan 2012
Posts: 1,103
Likes: 1
From: Lakeland, TN
IPR?
About to tear the top off of the engine again and just happened to have one of those episodes where it has the rolling idle after a long interstate run. I was reading about how IPR valve problems can cause rough idle when hot, among other issues. Can an IPR problem be JUST the rough idle or does it need the starting issues as well? I bought the truck new and it's done this periodically for 10 years next week.
Elder User
Joined: Oct 2010
Posts: 552
Likes: 1
My 03 does exactly the same thing only after a long interstate run. Brand new IPR, ICP, FICM, 8 injectors has not solved the problem.
I was thinking that maybe it could be the exhaust back pressure sensor, but the stock Ford strategy that I have has that sensor written out and uses inferred values instead from what I understand.
If you figure it out, I'd definitely like to know what it was.
After a couple years I've finally just considered it to be the character of the truck and stopped worrying because it runs great otherwise.
I was thinking that maybe it could be the exhaust back pressure sensor, but the stock Ford strategy that I have has that sensor written out and uses inferred values instead from what I understand.
If you figure it out, I'd definitely like to know what it was.
After a couple years I've finally just considered it to be the character of the truck and stopped worrying because it runs great otherwise.
Thread Starter
|
Laughing Gas
Joined: Jan 2012
Posts: 1,103
Likes: 1
From: Lakeland, TN
My 03 does exactly the same thing only after a long interstate run. Brand new IPR, ICP, FICM, 8 injectors has not solved the problem.
I was thinking that maybe it could be the exhaust back pressure sensor, but the stock Ford strategy that I have has that sensor written out and uses inferred values instead from what I understand.
If you figure it out, I'd definitely like to know what it was.
After a couple years I've finally just considered it to be the character of the truck and stopped worrying because it runs great otherwise.
I was thinking that maybe it could be the exhaust back pressure sensor, but the stock Ford strategy that I have has that sensor written out and uses inferred values instead from what I understand.
If you figure it out, I'd definitely like to know what it was.
After a couple years I've finally just considered it to be the character of the truck and stopped worrying because it runs great otherwise.
Elder User
Joined: Oct 2010
Posts: 552
Likes: 1
Well dang! I was hoping to get a real answer some day. This has been a major annoyance for a long time now. My HPOP got replaced over a year ago and it stopped for 6 months or so. I thought that must have been the problem. Unfortunately, it started back and will now occasional do it when it's not been run all that far. I think that may be due to my blocked oil cooler causing higher engine temps much faster than usual. We'll see in a few days when that gets replaced.
Thread Starter
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Laughing Gas
Joined: Jan 2012
Posts: 1,103
Likes: 1
From: Lakeland, TN
Yeah. I didn't think that would help the rolling idle.
Thread Starter
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Laughing Gas
Joined: Jan 2012
Posts: 1,103
Likes: 1
From: Lakeland, TN
I HAD an IPR theory, now dashed.
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Postmaster
Joined: Feb 2006
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From: waynesville, mo.
Dirty turbo or egr valve (because of the inferred strategy). Take your batteries loose for a couple of minutes, start it up (operating temp), let it idle for 5 minutes at least.
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Elder User
Joined: Oct 2010
Posts: 552
Likes: 1
I cleaned my turbo and I have an egr delete. No change.
Thread Starter
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Laughing Gas
Joined: Jan 2012
Posts: 1,103
Likes: 1
From: Lakeland, TN
EGR delete, had the turbo taken apart and cleaned several years ago with no changes. I'll try the battery thing after the external oil cooler gets done this week. Thanks.
Post Fiend
Joined: Oct 2009
Posts: 12,123
Likes: 35
From: N. Fort Worth, tx
most common is icp voltage input is bad. have also seen pumps, ficms and injectors do te same.
vgt can cause an engine surge of around 200-300 rpm.
concern when speed contol is activated can be normal
vgt can cause an engine surge of around 200-300 rpm.
concern when speed contol is activated can be normal
Postmaster
Joined: Feb 2006
Posts: 3,201
Likes: 4
From: waynesville, mo.
The egr delete doesnt help. Its more the procedure than anything. The problem is because you've lost the "VGT learn". Your pcm is searching for the proper place to set the vgt vanes at the particular engine speed that you're operating at. Thus the "surging" that you're experiencing. EGR is a major contributor to this strategy.
Elder User
Joined: Oct 2010
Posts: 552
Likes: 1
The egr delete doesnt help. Its more the procedure than anything. The problem is because you've lost the "VGT learn". Your pcm is searching for the proper place to set the vgt vanes at the particular engine speed that you're operating at. Thus the "surging" that you're experiencing. EGR is a major contributor to this strategy.
Thread Starter
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Laughing Gas
Joined: Jan 2012
Posts: 1,103
Likes: 1
From: Lakeland, TN
Mine won't roll nearly that bad. When running well, the idle will be from 650 to 660 with no audible change. When NOT running well, it will roll from the 630s to the 670s and is noticeable enough that "non truck people" ask me what it's doing.