Hey guys - sorry I haven't been on in a while.

My truck is freaking out and I have to get to jury duty today! It started the other night. Truck was running fine and then went into limp mode with the CEL on. I put it in nuetral, turned it off and then restarted after a few seconds. The Amp gauge showed the glow plugs were on and it ran fine. As soon as the amps went back to normal, the thing went into limp mode with CEL. It did that about 4 times until I ran the snot out of it while the GPR was on and then it cleared up and ran fine all the way home. The next day was suny and nice and it ran fine. The last 2 days it has been rainy and the same thing is happening but I can't clear it up.

I replaced the GPR after talking to Bill and it didn't change anything. I also pulled the Exhaust Pressure Sensor and cleaned it out (that is the code, I believe).

Any ideas?

 

What are you calling "limp mode" ?
The EBPS will not affect the way it performs

 

It feels like it is running on about 4 cylinders. I thought that was a limp mode it went into but maybe I am wrong about that.

It didn't seem to matter if it is warm or cold, though, if that means anything.

 

Just to be clear the pressure sensor I pulled out and cleaned is up at the front by the HPOP, not the thing I unplugged back by the turbo.

 

I'd be checking the UVC harness, and the wiring to the VC. To me is sounds like you have some burned pins, and the IDM is shutting one bank off.

 

Thanks - I just replaced them all a few months ago so that worries me, but I will go take a good look.

 

What Tom said.

The sensor in the front controls the valve on the turbo

 

I started it and then pulled the two little wires off the gpr immediately. It didn't have any problem and I just finished driving to jury duty (the third 60 mile round trip this week!). I just taped the little wires up so they wouldn't touch anything. But I don't really understand what is going on. So any further explanation and advice is appreciated. At least they won't swear out a warrant for me!

 

No, it doesn't. EBPV is controlled by the PCM, which uses TEMPERATURE (EOT and IAT) to determine when to close it.

What brand?

(That's a voltmeter on the dash BTW, not an ammeter. The oooold trucks had an ammeter.)

 

I think the pcm uses the ebps as a check to open the valve if pressure gets too high. If the tube is plugged, the valve stays closed when its supposed to open.


Dan, you might have a finicky CPS. I've had them act like that before. Something about the voltage draw from the GP's or something, I don't know. It doesn't make sense to me.

 

The pcm also uses the EBPS to open the EBPV when you accelerate

 

Check the running system voltage Dan . and the idm for water and or loose connector.

 

According to the FSM, that's based on pedal position.

 

That was stupid of me, of course it is a voltmeter. I remain dedicated to hating all things electrical.

The gaskets and pigtails were the Dorman ones. It seems to me that if they were the problem it would effect the way it runs all the time. Wouldn't burnt pins mess up the injector control? It runs fine until the GPR cycles off and runs fine if I disconnect the GPR

 

Burnt pins are a on and off situation. I knew I had burnt pins once and wiggled them and drove another 100 to get home to change them.