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Old 01-27-2014, 11:30 PM
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bucking after egr delete, oil cooler replacement

This weekend I replaced my egr delete pipe and changed my oil cooler since I was there, changed oil, coolant, and replaced the unison ring in my turbo. The truck ran great this afternoon on my way to work, maybe slightly sluggish(40 miles) but tonight on the way home it was bucking/stuttering at cruising speed(60-70). It has done the same thing before when the injectors started going out but only at certain temperature ranges. ( it cleared up when the truck reached operating temps). this time it never stopped. The truck idles great and when I put my foot in it, the power is there. The turbo is acting like it should, and I have no leaks.

I am not really sure where to start. I plan on getting up early to check the connections on the FICM and the injectors, but if that isn't it I am kind of stumped. I really don't want to have to replace injectors again. Could it just be air in the fuel or oil lines??
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Old 01-28-2014, 11:04 AM
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bump to top
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Old 01-28-2014, 11:30 AM
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Pull your IPR and check the screen
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Old 01-28-2014, 01:33 PM
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I have an edge cts monitor would it show if the ipr is messing up.
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Old 01-28-2014, 01:58 PM
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It should. Watch IPR% when its acting up.
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Old 01-28-2014, 02:23 PM
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Ok I thought so, it seems to be acting just like it always has, small fluctuations across the rpm range. It acts the same when bucking, I started watching the icp voltage and it is staying steady as well even when the truck is "bucking". I will watch it more closely but that all seems ok
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Old 01-28-2014, 03:18 PM
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Is it possible that air is in the high pressure oil system that just needs to be worked out? A fuel pump that is getting weaker is also a thought that I am having.

My icp is running 750 at initial start up (cold), 580 when warm 1000-1300 on normal acceleration
Ipr voltage is at .9-1.0 when started and 1.5 or so on acceleration. It fluctuates roughly .1v thru out the driving range
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Old 01-28-2014, 05:29 PM
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Quote:
Originally Posted by dpmac83 View Post
Is it possible that air is in the high pressure oil system that just needs to be worked out?
Sure. Take it out and beat it like a red-headed stepchild for a bit and see if that helps it any.
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Old 01-28-2014, 06:40 PM
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My only concern with doing that is that if it is a weak fuel pump I run the risk of killing my new injectors. I am torn!
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Old 01-28-2014, 07:15 PM
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It useually takes a little longer to kill injectors than a hour or so. Unless your running them bone dry and then you wouldn't run at all.
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