Missing bad and lost power
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Joined: Jan 2012
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From: Southern West Virginia
The IPR and injector o-rings that I ordered 2nd day air Saturday, just got here yesterday, due to the holiday I imagine. Any way, I'm going to pull all the injectors today.
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Joined: Jan 2012
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From: Southern West Virginia
Yeah, I've had this rough/surging idle for a while now. The real bad missing has only happened twice in the last couple weeks. I changed the UVCH for #6 and #8 injectors, and haven't had that problem anymore, but the rough/surging idle and shuttering in the engine at around 1600 rpms and bluish smoking at start up, seems like an injector o-ring. I just did all new o-rings 6 months ago, but I'm gonna check them anyway. I bought a new IPR too, just in case it is a sticking IPR. The "rough" part of the idle seems like a dead cylinder, and the "surging" part seems like icp........I don't know. I hate to just throw parts at it, but I WILL figure it out.
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Joined: Jan 2012
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From: Southern West Virginia
I honestly don't think it is injector o-ring problems. I opened the fuel bowl, and the bowl and filter are as clean as can be. That filter has been in there for atleast 7000 miles, and as I said before, the o-rings are only 6 months old. So, I think I'm gonna change the IPR first.
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Joined: Jan 2012
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From: Southern West Virginia
Well Darin, I'm the man!!! I just changed my IPR without pulling the fuel bowl! Believe it or not, the hardest part was getting the tin nut back on. LOL!! It's sitting out there idling now, working the air out. As soon as it gets warmed up I'm gonna take it for drive and see if my problem is solved.
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From: Southern West Virginia
I just took the truck for a drive, and the IPR was part of my problem. The "surge" part of the idle is gone, but it still idles a little rough. Now that I feel pretty confident that it's not injector o-rings, because of how clean the fuel bowl is, I'm back to UVCHs. LOL!! We're having our Thanksgiving dinner now, so I'll be back on here later for you guys thoughts now.
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This is from Diesel Mans page Page
Actually , IIRC, the ICP defaults to 721 ...
Low ICP /IPRreadings could be caused by poor oil, internal oil leaks, or a high pressure oil pump, ICP or Injection Pressure Regulator malfunction. Isolating the cause can be done by disconnecting the ICP (the PCM will default to an ICP reading of 700 PSI and use other inputs for IPR control) and/or installing a high pressure oil gauge to monitor ICP pressure directly. If the concern is a rough, uneven idle that smooths out after disconnecting the ICP, The problem is most likely either the ICP malfuntioning or the IPR sticking. The manual says to replace the ICP first, but I have found that it is usually IPR. If you ever encounter an engine that runs with the IPR valve disconnected, the IPR is definitely sticking.
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Joined: Jan 2012
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From: Southern West Virginia
I've been hoping you'd chime in Rick. Ever since this idle issue started, I've been thinking IPR. Changing it today helped part of the problem, the surging, but it still idles like it has a slight miss. Am I correct assuming that since the fuel bowl is very clean, that it is not an injector o-ring problem? From an idle, I can slowly bring the rpms up and at 1000-1200 rpms the engine shakes. It seems to get better from there on up the rpm range. If it's not o-rings, I'm back to the UVCHs again.
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Joined: Aug 2006
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I've been hoping you'd chime in Rick. Ever since this idle issue started, I've been thinking IPR. Changing it today helped part of the problem, the surging, but it still idles like it has a slight miss. Am I correct assuming that since the fuel bowl is very clean, that it is not an injector o-ring problem? From an idle, I can slowly bring the rpms up and at 1000-1200 rpms the engine shakes. It seems to get better from there on up the rpm range. If it's not o-rings, I'm back to the UVCHs again.
If you can scan it , we need to see ICP, IPRDC% (warm & cold ) .. We also need to see EOT as it compares to ambient air temp..
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From: Southern West Virginia
170,000 miles on the truck, and I'd say that's the mileage on the injectors, and I just changed the oil, 50 miles on it.
Changing the IPR today made it run better and so far, eliminated the surge. Does the fact that the fuel bowl is very clean eliminate o-rings, or am I wrong thinking that?