Well, truck is throwing me for a new loop the day I pick it up from the body shop (crazy, right?). I started out driving it and had a blue haze - I figured it had some air left in the system from doing my injectors so I left it and it cleared up after about 20 miles. I noticed that my SES light came on while idling at a stoplight, but went off when I took off. Figured it was a fluke and kept on getting on.

Well, next light it does the same thing - idle the light is on, take off the light is off. Reading the code yields P1316 - so I pull over and running a buzz test to fetch the IDM codes. Guess what? No codes. All sounded fine, so this is where I got really confused as I'm getting huge mixed signals from this truck suddenly.

As I got to watching my gauges, I noticed that I was idling around 10.8 IPRDC and 530-560 ICP, and when I would get about 16-18 IPRDC the code would go away. Did a near-WOT run when getting on interstate as a test to see how it'd do, and saw IPRDC get up to 98% - the highest I have EVER seen it get on this truck (no idea if it is related or not). I have a log from moving around the lot that I will try and upload soon.

Searching around I haven't found a close case to mine yet, so I'm hoping y'all may have some ideas to throw around.

 

1. You're tuned, the stock tune would never allow the IPR to go over 64%.
2. High IPR after injector work usually signifies either one or more injectors have worked loose, an O-ring was damaged at some point, or an injector internals failed. One other possibility is you just need to wait for all the air to purge from the oil system (about 50 miles of driving).
3. P1316 might be a loose UVCH, so I would click the UVCH link in my signature to troubleshoot.

 

I'm leaning toward it being electrical as you're thinking with number three, as I ran it a good three or four hours last night of mixed driving (and some hard driving to try and get use to it again) with no change. The main thing I can think of is that the new UVCH I put on is faulty from the get-go. I'm thinking to just replace both at once again as I can just swap them out no questions asked at work.