Ruff Idle after T500 Install
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4000 rounds a min
Joined: Apr 2010
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From: Albemarle NC
Ruff Idle after T500 Install
As the title says, I installed a T500 HPOP with new IPR and new HPOP lines also rebuilt the fuel bowl, and installed a new EBPS at RRE this last week. I have put a little over 300 miles on the truck scene the install and I still have a ruff idle after it warms up. ICP is around 625 cold and after it warms up it's around 525ish. and this is when the ruff idle is felt. Any ideas?
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
Well it shouldn't be the pump causing it. Since you can read ICP, can you watch IPR % too? Does the idle smooth out if you unplug the ICP sensor? How many miles on the oil and is it due for a change?
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4000 rounds a min
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From: Albemarle NC
Yes I can read IPR% but I don't remember what it was, The ICP is only a little over a year old and no oil in plug. I have not unpluged it to see if the idle smooths out but I will in the morning when I get to work. The oil only has about 3000 miles on it.
Post Fiend
Joined: Sep 2003
Posts: 6,096
Likes: 26
From: Mesa AZ
I am dealing with the same issue myself. I have about 120 miles since the HPOP hoses were replaced. My engine idles super smooth until I drive it around for a while....then I can feel it running slightly funny at idle and it vibrates a little bit. Seems like the rpms rise and fall slightly as well. If I leave it to idle for 5 min or so, then it smooths out again. 
I checked for codes and had ICP higher than desired and ICP lower than desired and a third code for CPS bank 1 not found. I had never seen that one before....
I cleared the codes and drove around some more and it improved a bit but still not perfect. I think I will clean the connector for the CPS and see if that helps...
I checked for codes and had ICP higher than desired and ICP lower than desired and a third code for CPS bank 1 not found. I had never seen that one before....
I cleared the codes and drove around some more and it improved a bit but still not perfect. I think I will clean the connector for the CPS and see if that helps...
Tuned
Joined: Jan 2004
Posts: 419
Likes: 1
From: Jamestown, TN
Could you be sucking air in the fuel?
I know that you rebuilt the fuel bowl, could there be something letting air in the fuel.
I haven't seen any issues with my T500, but the fuel wouldn't explain the AE numbers.
I know that you were downhill most of the way home. It may be time to get it on the interstate and give it a Tennessee tuneup. Of course you have an oil crossover so there shouldn't be any air in the oil rails.
Hook up AE and do Ken's test for HPOP oil pressure while going wide open throttle.
I haven't seen any issues with my T500, but the fuel wouldn't explain the AE numbers.
I know that you were downhill most of the way home. It may be time to get it on the interstate and give it a Tennessee tuneup. Of course you have an oil crossover so there shouldn't be any air in the oil rails.
Hook up AE and do Ken's test for HPOP oil pressure while going wide open throttle.
Thread Starter
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4000 rounds a min
Joined: Apr 2010
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From: Albemarle NC
I am dealing with the same issue myself. I have about 120 miles since the HPOP hoses were replaced. My engine idles super smooth until I drive it around for a while....then I can feel it running slightly funny at idle and it vibrates a little bit. Seems like the rpms rise and fall slightly as well. If I leave it to idle for 5 min or so, then it smooths out again.
I checked for codes and had ICP higher than desired and ICP lower than desired and a third code for CPS bank 1 not found. I had never seen that one before....
I cleared the codes and drove around some more and it improved a bit but still not perfect. I think I will clean the connector for the CPS and see if that helps...
I checked for codes and had ICP higher than desired and ICP lower than desired and a third code for CPS bank 1 not found. I had never seen that one before....
I cleared the codes and drove around some more and it improved a bit but still not perfect. I think I will clean the connector for the CPS and see if that helps...
Thread Starter
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4000 rounds a min
Joined: Apr 2010
Posts: 2,223
Likes: 0
From: Albemarle NC
I know that you rebuilt the fuel bowl, could there be something letting air in the fuel.
I haven't seen any issues with my T500, but the fuel wouldn't explain the AE numbers.
I know that you were downhill most of the way home. It may be time to get it on the interstate and give it a Tennessee tuneup. Of course you have an oil crossover so there shouldn't be any air in the oil rails.
Hook up AE and do Ken's test for HPOP oil pressure while going wide open throttle.
I haven't seen any issues with my T500, but the fuel wouldn't explain the AE numbers.
I know that you were downhill most of the way home. It may be time to get it on the interstate and give it a Tennessee tuneup. Of course you have an oil crossover so there shouldn't be any air in the oil rails.
Hook up AE and do Ken's test for HPOP oil pressure while going wide open throttle.
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Post Fiend
Joined: Sep 2003
Posts: 6,096
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From: Mesa AZ
It
I have the black CPS also. I ran a CCT when the idle was smooth and it passed without any faults. Then when I got home it was idling a little funny so I tried to hook up AE and check again but AE crashed. Now I can't get it to recognize the Enhanced features. 
It has been one of those months for me....if it can go wrong, it will. (I think that is one of Murphy's Laws...)
It has been one of those months for me....if it can go wrong, it will. (I think that is one of Murphy's Laws...)
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Thread Starter
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4000 rounds a min
Joined: Apr 2010
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From: Albemarle NC
It
I have the black CPS also. I ran a CCT when the idle was smooth and it passed without any faults. Then when I got home it was idling a little funny so I tried to hook up AE and check again but AE crashed. Now I can't get it to recognize the Enhanced features.
It has been one of those months for me....if it can go wrong, it will. (I think that is one of Murphy's Laws...)
I have the black CPS also. I ran a CCT when the idle was smooth and it passed without any faults. Then when I got home it was idling a little funny so I tried to hook up AE and check again but AE crashed. Now I can't get it to recognize the Enhanced features.
It has been one of those months for me....if it can go wrong, it will. (I think that is one of Murphy's Laws...)
Post Fiend
Joined: Sep 2003
Posts: 6,096
Likes: 26
From: Mesa AZ
BTW, my engine ran much better today. Super smooth at start up and then 10-12 miles into my trek it began to run a little funny again. However its practically un-noticeable. I think another few days and it will be back to normal (hopefully). My oil is old....about 6 k miles. I think I'll change it tonight and see if that helps. Sorta feels like the oil is foaming up a bit once it gets whipped around a bit.
Thread Starter
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4000 rounds a min
Joined: Apr 2010
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From: Albemarle NC
OK a little update, Got home from work a bit ago and pulled the ICP plug and had a change in idle, it smoothed out a little, the roughness didn't go away completely but it did subside a little. didn't have AE hooked up, so do i need to hook up AE and do this again? Or would it even give any info as to what happens when the ICP is unplugged. I know it goes to a default value.
Molon Labe
Joined: Dec 2006
Posts: 5,272
Likes: 1
From: Alaska
I'm thinking out loud here Rich, but I had a rough idle (when warmed up and after highway speeds) shortly after I installed a New Ford IPR.
I swapped out just the solenoid from the old IPR and the issue has never returned.
It may be worth a try.
I swapped out just the solenoid from the old IPR and the issue has never returned.
It may be worth a try.
Post Fiend
Joined: Nov 2007
Posts: 9,549
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From: Payson, AZ
OK a little update, Got home from work a bit ago and pulled the ICP plug and had a change in idle, it smoothed out a little, the roughness didn't go away completely but it did subside a little. didn't have AE hooked up, so do i need to hook up AE and do this again? Or would it even give any info as to what happens when the ICP is unplugged. I know it goes to a default value.
Typical things to check: Make sure the IPR connectors are dry and clean, and fully seated, and secured with the wire clip. Also check the IPR connector wires and the nut. Make sure the solenoid does not rotate when nut is tight.
Did you use new IRP o-rings when you swapped it to the T500?
