Engine loping and rough idle
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Senior User
Joined: Oct 2005
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From: Utah for now
Originally Posted by SilverBullet131313
What is IPR? And i am starting to have similar issues i think...idle is rougher.....not real smooth as before.seems to be constantly moving a little but never moved at idle before..and can hear it surge each time a little...and seems to be constantly down on power throughput operating temp and range.....almost like its not hitting on all 8....but obviously not that extreme but i hope you get what i am saying. And very rough on start ups. Sound similar?
Here is the link to the IPR servicing proceedure.
http://cw-diesel.com/LuxSite/IPRInfo.htm
If this doesn't help, I would get a cylinder contribution test done to see if you have any weak or failing injectors. Hope this helps you a bit.
Senior User
Joined: Apr 2004
Posts: 340
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From: Maryland
Originally Posted by BadFord99
The IPR is the injector pressure regulator; it is located on the aft side of the high pressure oil pump in the valley of the engine. Your symptoms seem to be similar to the ones I was having. I didn't have rough starts, but did seem to lack a bit of power, and it did start surging.
Here is the link to the IPR servicing proceedure.
http://cw-diesel.com/LuxSite/IPRInfo.htm
If this doesn't help, I would get a cylinder contribution test done to see if you have any weak or failing injectors. Hope this helps you a bit.
Here is the link to the IPR servicing proceedure.
http://cw-diesel.com/LuxSite/IPRInfo.htm
If this doesn't help, I would get a cylinder contribution test done to see if you have any weak or failing injectors. Hope this helps you a bit.
Where or who can do a cylinder contribution test??? And how much does that normally cost?
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Senior User
Joined: Oct 2005
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From: Utah for now
Originally Posted by SilverBullet131313
Where or who can do a cylinder contribution test??? And how much does that normally cost?
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Senior User
Joined: Oct 2005
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From: Utah for now
Originally Posted by SilverBullet131313
Ok great!!!
You siad you replaced the ICP and CPS......where is best place and approx price to get them from?
Thanks
You siad you replaced the ICP and CPS......where is best place and approx price to get them from?
Thanks
ICP approx 39.00, CPS approx 49.00-59.00
Cargo Master
Joined: Jun 2003
Posts: 3,292
Likes: 6
From: Ardenvoir, Washington
I have had the rough idle/loping on my 99 since it was new.. Being that this is my 1st diesel, i figured this is just normal when cold. After about a minute of warming up, it was ok.. (even parked in the warm garage over night it would lope). I was using Delo 400 for the last 64,000 miles. Well, to make a long story short, i switched last week to Shell Synethic 5w-40 and the "loging" competely disappeared even letting the truck set outside over night now. Injectors must really like the stuff.. I am impressed !
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