Question: Truck lost power

[atomicglock]

I had a strange thing happen yesterday. I was headed for town around 9 am, about 10 miles from home and the truck was fully warmed up. Temp was in the 20's and sunny. I came to a small incline when I just lost power. Engine was still running and I was in 6th gear. I stomped my foot to the floor, but I couldn't get any rpm's and I continued to slow down, the engine lugging like I was pulling a very heavy load. I shifted down to 5th and put my foot to the floor again just to make it to the top of this small hill. After a minute of so she straightened out and started running like normal.

At first I thought it might be fuel gelling but I dismised that because I always put anti-gel in at every fill up.

Anybody have any thoughts on what might have happened? Throttle position sensor maybe or am I way off base?

Howard

 

[BJS]

Holy Huge text, no need for bifocals.


It could be EBPV closing, TPS faililng, Fuel Gelling is possible even with antigel (when was the last time you drained water from your filter housing)

 

[atomicglock]

Holy Huge text, no need for bifocals.


It could be EBPV closing, TPS faililng, Fuel Gelling is possible even with antigel (when was the last time you drained water from your filter housing)

Yeah, sorry about the size of the text. I really hadn't intended for it to be that large.

The ebpv will close all by itself, even when the truck is fully warmed up?

Howard

 

[Tail_Gunner]

The ebpv will close all by itself, even when the truck is fully warmed up?

Howard

On a cold day when running without a load or very lightly loaded, it might be possible for the EBPV to want to closed when running down the road. I've had the fast idle kick-in within a minute or two after pulling off the highway and parking. That tells me that on a cold day, the engine still stays on the cool side temperature wise.

There is a thing called a Exhaust Back Pressure Sensor. It is on the end of a tube that runs from the Rt. Side exhaust manifold to the EBPS's location at the front of the engine near the HPOP reservoir. What that gizzmo does, is to sense an increase of exhaust back pressure when the EBPV (Ex Back Press Valve) is closed, typically when you put your right foot down. If that EPBS tube get a hole rusted in it or if it is plugged, the EPBS never sees an increase in exhaust back pressure and doesn't tell the PCM to open the EBPV to allow for the engine to make the power it's supposed to.

A quick fix if that is the situation, where the EBPV is closing or staying closed might be to unplug the wire connector at the turbo pedestal. This would disable the EBPV in the open position. If your loss of power problem disappears, then you may have narrowed your cause down considerably.

Now, I experienced a loss of power myself on several occasions. But when I did experience that loss of power, the sound of the engine changed. It sounded like the injectors got quieter. This typically happened when the engine was warming but still not fully up to temp. I guessed it might be the IPR. I got an "O"-ring kit to service the IPR. I took out the IPR, disassembled it, cleaned and re-installed it with the new "O"-rings. Problem hasn't re-occured since.

 

[atomicglock]

Thanks, Tailgunner, I'll have to check this out if it ever happens again.

Howard