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01 surge with rough idle

1770 Views 2 Replies 3 Participants Last post by  sstandri
Hello everyone, I need some help. Ive done some research but cant come up with a starting point. My truck developed a new rough idle and a surge while driving. It doesn't do it under load or acceleration. It is worse with the cruise control on. At idle the RPM's drop 50 to a 100 but not all the time. It occures more often when warm then cold. No power loss noticed but I can raise the engine RPM to around 1300 to 1400 and notice a fairly constant miss. I have recently replaced all the glow plugs right side harness, changed the oil and looked for oil in the ICP connection. Can someone let me know where to go next. I was thinking the IPM but don't know where it is or how to test.
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Thaks Kanman , Im not sure what you mean by checking the oiling of the injector. How can you tell? I replaced the right side harness but not the left. It was throwing a #8 glow plug code. Replace the gow plugs then the harness. Solved the problem. It is such a slight miss I dont think an injector is not working. I have not scanned for codes yet I will in the next couple of days. If anything shows up on the left bank I will replace the harness and go from there.
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