P0088...reprogram...Tsb to come.

8WA Sman · September 30, 2014

#6 is showing -15 on the fuel trim, #2 about -8 on the power balance but showing #4 on the fuel trim.

Did you check for shiny's in the upper fuel filter? -15 fuel trims could be metal under the injector pintle.

blown99 · October 1, 2014

#6 is showing -15 on the fuel trim, #2 about -8 on the power balance but showing #4 on the fuel trim.
Did you check for shiny's in the upper fuel filter? -15 fuel trims could be metal under the injector pintle.

There are shiny particles in the upper filter housing. This truck has a complaint of excessive fuel in the oil too. Pulled the injectors and flipped them upside down, Every injector is leaking out the return port to some degree. How much fuel leakage is acceptable out of these ports? How does this prove that that injector is the cause of the fuel getting into the oil, that port drains into the return rail no the crankcase. Will be working on replacing the hpfp.

cbriggs · October 1, 2014

Overfueling cylinders will wash the cylinder walls and fuel will end up in the oil that way. Anything with a negative fuel trim shows the pcm is attempting to correct for overfueling. -16 is a lot.

cbriggs · October 1, 2014

Connect the injectors to the rail (upside down)using the old fuel lines, without the electrical plugs connected. Crank the engine and see if you have any leaking pintles. This will also show any leaks to return port, although they usually wont start if leaking to return.

blown99 · October 1, 2014

Connect the injectors to the rail (upside down)using the old fuel lines, without the electrical plugs connected. Crank the engine and see if you have any leaking pintles. This will also show any leaks to return port, although they usually wont start if leaking to return.

That is was I did. Every injector leaked out the return port to some extent. None leaked out of the pintle. I see no leaks on the rail, lines or any area that could leak into the crankcase. Most likely what you mentioned is the cause of the excessive fuel in the crankcase coupled with the normal regen oil growth.

forddieseldoctor · October 3, 2014

The TSB wasn't a fix as much as it was a bandaid to get trucks out of warranty, it's still hit or miss and I always quote a pump anyways. You may catch a pump starting to fail but if you release a truck with a TSB reprogram and the pump fails in few weeks wiping out a whole fuel system I would be stuck thinking that could have been prevented. It almost happened to me, caught an ITP just starting to come apart on the last P0088 I did.

I have to ask which two cylinders have wacked out fuel trims?

Hmm really. I've flashed quite a few of them in the last 2 years and haven't had a one come back for any other fuel system issues.

Keith Browning · October 3, 2014

I think I have seen one come back to get a pump.

Matt Saunoras · October 4, 2014

I think at least half I've done weren't "fixed" by a reprogram.

Look at it this way. What is the TSB actually repairing?

forddieseldoctor · October 4, 2014

I agree that all the reflash is doing is changing the way that the computer handles the data, but in my opinion it does actually fix the issue at hand. But isn't P0088 fuel rail pressure too high, not too low?

blown99 · October 5, 2014

Yes, it is for the rail pressure spiking high.

Matt Saunoras · October 5, 2014

Which is caused by a sticking PCV.

forddieseldoctor · October 5, 2014

Ah. Gottcha. I was thinking the pump itself was failing.

Keith Browning · October 5, 2014

:chinrub2: Couldn't the owner just put a few gallons of Diesel Kleen, 2-stroke oil or ATF through the system to free up the PCV?

I read on the interwebs somewhere that works. :haha2:

Steve Mutter · October 6, 2014

Better yet just run gas through it, clean the whole system out. Hahahaha

leavnon3rd · November 12, 2014

just as a update to this thread, i also had a intermittent p0088, put a pump in 2 weeks ago, 1000miles on it so far and issues are gone.. everyone that has had a p0088 end of the parts trail leads to a pump curing it