Starts and runs ok. CEL came on, P0236 and P1211. ICP is running high, maybe 1000-1400psi at idle. Switching tunes doesn't seem to make a difference at all. ICP will easily get up to 3000 on modest accelleration with no load and empty truck. On fast idle setting it definately seems like it's got a miss. IPR problem maybe? Oil flow restriction pushing pressure up? Why wouldn't IPR open more to get the pressure down? No external leaks or other odd behavior noticed yet.

 

any way you can get a video? sounds like an injector may be dead/not firing

 

WHat is the IPR DC% at idle?

 

Bad news for me. It appears to be an intermittent problem. Maybe an injector is starting to stick. I bought the truck with 221K on it in 2007 I think and sent the injectors to Jim for overhaul and stage 1 mods. I have 250K on it now. Regular Rotella 15W-40 changed at 3000 mile intervals.

Parked the pickup for a few hours and used another rig and trailer instead. Went back outside now to check duty cycle for Action and it started easy with no miss and no CEL. ICP is still a bit high at idle, but EOT was in the 80's so the oil is still thick. Current ICP at idle is 850-900, duty cycle 4.6%. Normal is more like 750. Revving it up in neutral will briefly jump duty cycle up to maybe 20%. I will have to drive it to see if I can reproduce the problem I guess.

If an injector sticks and is not consuming oil, is that extra oil more than the IPR can pass, thus pressure running high? While I was driving it home earlier today I did not have any extra unburned fuel type smoke or smell, so that could support a stuck injector as well, not pumping fuel either. Thoughts?

 

Duty cycle of 4.6 points to a plugged edge filter . 95 may have it in the IPR .. ...the IPR doesn't care what the injectors are doing .. THe ICP sensor reports what it is seeing & tells the PCM .. THe PCM tells the IPR what to do based on reported ICP

 

So pull the IPR and disassemble hoping to find the end full of crap? HPOP is the standard 15* that was modded to 17* a few years ago by Joey. IPR is original as far as I know. I think I might have an IPR parts kit somewhere.

 

We will need the serial number of the engine . Its stamped in the block near the oil filter & IIRC ,on a sticker On the front of
the HPOP..Second pic is obviously with out the edge filter

 

Thanks Rick, I will try to find the serial #. It was a few years ago when I had the IPR out for the HPOP mod, I can't remember which version it is.

New observations. I drove it down to Home Depot just now. Started fine, no CEL, ICP about 1000 and DC 4.6%. CEL came on after about 8-10 mins, just like it did yesterday. Soon as the CEL came on, the ICP at idle was to 1300-1400 and DC to 14.0%. Shutdown and restart results in no CEL, ICP 1000, and DC at 4.6% again.

 

PCM is very confused . I bet you could start the truck & unplug the IPR & it will stay running at idle ...

 

I'll pull the IPR and take a look. If it's not the edge filter version I'll pull the HPOP as well. Shucks, I've had a clean dry valley for several years too.

 

Not a good day. HPOP fill plug was seized. Broke a couple 1/4" drive adapters before giving up and welding an allen wrench into the recess. Got it out and pumped out the reservoir.

Pulled the IPR. It is not the type with the edge filter. It's the open end trumpet bell shape.

Disassembled the IPR anyway, all clean and seems fine. Pilot valve was not taken apart but moves smoothly and spring feels fine. Actuator end came apart easy, no debris and parts move smoothly.

Pulled the HPOP. Not good news. The input shaft seal was pushed out and rubbing against the drive gear. Pushed right past the punched stakes. The rubbery paint on the seal body was worn away, but no metal wear is evident. ICP pushed it out I'd guess? I drove probably 15 miles after this incident started.

Pulled the "non-serviceable" plug on the HPOP and to my surprise, I don't see an edge filter in there. The little ball looks to be there when I look down the IPR hole, but I can stick a screwdriver down the removed plug hole probably 2.5" or so. If the edge filter was there, it's tail end would be down where the non-serviceable plug pin end sits, right? Maybe this is Joey's "modded 17"? He's the only one who's been inside this pump.

I tried to send Joey an email, but it was undeliverable. Is he still around? I'm afraid something inside the HPOP has gone to pot.

 

As far as I know he's still around, hope so, I need another HPOP.

 

That happens sometimes with Joey's email. It's always full and the message sometimes doesn't get through. Just gotta try again. Usually he's 2 days to respond to mine once I get them through. Busy, busy guy.

 

Action, any ideas?

I have thought of attempting to spin the pump on the bench and see if I can tell if any oil will exit the drain. Is the anti drainback check valve in drain passage? Maybe it's clogged?

Any chance my ICP sensor has gone bad? Any way I can do any testing of the ICP sensor and/or IPR? Obviously the truck doesn't run at the moment, no fuel or HPO systems installed. I have a Scangage and basic multi-meter skills as my only electrical tools.

 

THe Anti drainback valve is in the block . I have pics at work , I'll try to post them tomorrow ...