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Test drove truck yesterday after installing my reman injectors and I have a sputtering and misfire problem at WOT between 2500- and what ever the rev limiter is.
ICP @idle 540-570
IPR @idle 9-10%
ICP @WOT @3k+ 2800
IPR @ WOT @3k+ 30-36%
The problem when this sputter happens the ICP spikes up to 3200psi and IPR IIRC drops or stays at 30% and truck has a misfire on at least one cylinder (truck vibrates when it happens) and it randomly does it as well. (So me thinks it's a sensor or wiring problem, which is weird as truck ran good before injectors and before one of them crapped out and even them it only misfired at idle wot ran great)
Have codes for open circuit on bank 2 accompanied by injector open circuit on injectors 2,4,6,8 when I did a buzz test.
Checked resistance on wiring to and from IDM, VC harness and even swapped 2 idms with the same result.
Any thoughts on what could it be?
(after going back and checking every single wire going to the engine harnes and finding nothing wrong. I decided to unplug the battery to reset any codes that my scanner "missed"
and this is where I realize I never unplugged the freaking battery's when doing the injectors, oops, although not the first time I have forgotten to unplug them but never had something like this happen so there's that.)
Behold! problem went away bank 2 codes dissappear when doing the buzz test, truck runs awesome, no more sputtering put 50 miles on it and is doing great.)
You mentioned you checked resistance from IDM to VC harness, does that include the UVCH down to the injector connector? I believe you installed "updated" Dorman UVCH's on the same truck, is that right?
Perhaps the issue with the wiring only presents itself when a certain vibration (RPM or engine load) is attained?
I can post the pinpoint tests for the DTC's you have, but I am pretty sure you are already familiar with them.
My mind went to the new gaskets as well.
Losing a bank or injector would drive ICP up and IPR would try to compensate according to the logic in my head.
Quickest check may be to throw the old gasket back on there.
You mentioned you checked resistance from IDM to VC harness, does that include the UVCH down to the injector connector? Yes. I believe you installed "updated" Dorman UVCH's on the same truck, is that right? Yes
Perhaps the issue with the wiring only presents itself when a certain vibration (RPM or engine load) is attained? That's my thought as well
I can post the pinpoint tests for the DTC's you have, but I am pretty sure you are already familiar with them.
Si.
Originally Posted by RacinJasonWV
My mind went to the new gaskets as well.
Losing a bank or injector would drive ICP up and IPR would try to compensate according to the logic in my head.
Quickest check may be to throw the old gasket back on there.
Going to try that next
Originally Posted by Bitterroot Diesel
Give it 100 miles of spirited driving.
Plenty of Rat Flink driving. I'm thinking wiring as it only does it randomly.
I'll change the driver side gasket and go from there even though it tested "good".
No more dorman for me. These dorman harnesses were installed by a shop 1000 miles away from home on a trip to CO. These pics are of a harness less than 2 years, and under 5000 miles. The insulation is cracked/split.
Yes, buzz on all injectors sound nice and loud. I don't know why it keeps popping up when I do a buzz test. 42 pin connector insulation is good, and away from the valve cover, and resistance check proves its not shorting out.
I'm starting early, couldnt check yesterday way hot.
Test drove truck yesterday after installing my reman injectors and I have a sputtering and misfire problem at WOT between 2500- and what ever the rev limiter is.
ICP @idle 540-570
IPR @idle 9-10%
ICP @WOT @3k+ 2800
IPR @ WOT @3k+ 30-36%
I had a similar issue when I swapped my CPS from the gray to the dark blue version......mine sputtered as soon as I hit the pedal though. I swapped back and it went back to normal.
I hadn't thought to check my ICP/IPR numbers though.
But noticed that when I turn the AC the rpm drops to the point of making the engine stall, at idle with AC on the idle surges from 500 rpm up to 750rpm.
As soon as I remove the ICP it don't do it no more, checking wiring to the ICP (ICP is not that old and sawpped in a known good one)
Solved! Apparently for what ever reason reseting the PCM with my scanner didn't do the trick, but unplugging the battery's did. Truck is running awesome.
Solved! Apparently for what ever reason reseting the PCM with my scanner didn't do the trick, but unplugging the battery's did. Truck is running awesome.
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