My truck was idling in front of the house and quit like the key was turned off. No start. Scanned, no codes. KOEO test yielded P1283, IPR circuit fault. Inj. buzz test OK. Seems an amazing continuation of bad luck, after a long bout with a no start due to UVC connector problems, and then fuel in the rad. Is there a common cause with P1283?

 

Examine the wiring to first rule that out. I had mine actually come unplugged once before..

If wiring is ok, you likely need a new IPR.

 

Agreed, but if you're real lucky just the solenoid.

 

If you have a chip then start the vehicle and wiggle the chip a bit. This happen to me (not exactly the same way) when my chip carbon'd up a bit. If that is the case then pull the computer (easy to do), open the case, clean the contacts and put some electronic vaseline on each individual contact (do not smear from one contact to another to avoid a short).
That fixed me up quite well.

 

I couldn't find my ohmeter right away this morning to check the IPR wiring - everything looked OK, so I cranked and it fired right up. Ran awhile OK, warmed up. I shut off but later wouldn't start again. ??? What could this be, seems to be OK cold, but after warm up it doesn't want to run. Do these IPRs sometimes go bad due to heat?

 

OK. Do you know where the IPR is?

If you do then unplug it after it warms up as this will cause the computer to trip, turn on the check engine light but go into a safety mode but it should still run. Mine does.

If you don't know where it is at then look for a stub with and electrical connection plugged into it on top of the motor. Driver's side, above the valve covers and fairly close to the HPOP (High Pressure Oil Pump).

Give this a shot, let's see what happens.

 

I think what you mean is the ICP sensor. If it is unplugged, the computer defaults to an assumed value of HPOP pressure, but the engine will still run. The IPR is very hard to get at under the fuel filter bowl. If the IPR is unplugged or the wiring is bad the computer senses the fault and won't allow the engine to run. The IPR is a PCM output - a coil that is pulsed to regulate HPOP pressure. I was wondering if these units, being a coil, commonly fail due to heat.

 

Oh, yea, sorry, still learning things about these sweet motors.

But the IPR is a possibility,. I wonder how much they are to change.