2000 7.3 Powestroke - Diesel Forum

kyguy076 · 08-02-2009, 10:23 AM

200,000 miles 7.3 powerstroke automatic trans. the truck cuts out at low rpm. you can mash the pedal the stuttering clears up and the truck accelerates fine. once you let off the pedal and the rpms drop back the stutter comes right back. I changed the oil and filter and I replaced the fuel filter today also. I took it to a diesel mechanic he put it on the computer. NO CODES. The computer ran a series of test on the engine. Didn't come up with anything. I don't have a idea what to do now. The mechanic didn't either. Any ideas anyone? Could it be my oil is foaming? I put 15/40 rotella in it.

kyguy076 · 08-02-2009, 10:29 AM

Runs great on startup. as it warms up it gets worse

PowerstrokeConverters · 08-02-2009, 11:48 AM

Welcome to TheDieselStop!!!

I also have a 2000 7.3 but with less than 114k miles....

have you checked the EBV valve(exhaust back pressure)? could be closing up on you.....

Tell us more about the truck, is it all stock??
What have you done to it recently besides the fuel filter,oil etc..

kyguy076 · 08-02-2009, 04:44 PM

The truck is completely stock. I have only owned the truck a week. It was doin this when I bought it. (GOT A GOOD DEAL ON IT). Anway how do I check the exhaust pressure switch? The computer I ran on the truck flagged the exhaust pressure. The mechanic told me 9 out of 10 trucks have the same code not to worry about it. I also would like to know where to check the fuel pressure? Thanks

skibarefoot · 08-02-2009, 07:05 PM

Can you scan tool check high pressure oil? You could also have low oil psi from the high psi oil pump. Then when you rev the engine the high psi oil pumps puts out enough psi to work the injectors. You could also have low oil psi from the main oil psi pump. The main oil pump supplies low psi oil to the high oil psi resevoir. The high psi oil pump could be sucking the oil out of the res. before the main oil pump can fill it.

kyguy076 · 08-03-2009, 04:14 PM

fuel pressure is fine. Buzz test on injectors is fine. Contribution test was bad on #8 cylinder. internal control module rom error is what the computer said. CODE p0605. We reset it and it came right back. Snap on scanner suggested to replace the pcm. Hope this fixes it.

**klhansen** · 08-03-2009, 04:27 PM

Quote:

Originally Posted by kyguy076

fuel pressure is fine. Buzz test on injectors is fine. Contribution test was bad on #8 cylinder. internal control module rom error is what the computer said. CODE p0605. We reset it and it came right back. Snap on scanner suggested to replace the pcm. Hope this fixes it.

Are you sure the truck is stock? Maybe someone has had a chip or programmer installed on the PCM. My truck (programmed PCM) occaisionally comes up with a P0605, but don't have problems with it.

If you got a great deal on it, maybe dropping the $$ needed for a replacement PCM won't hurt that much. Check with Jody at DP Tuner on a replacement PCM if that's really what it turns out needing.

PowerstrokeConverters · 08-03-2009, 05:41 PM

if you know a buddy that has a SCT or Superchips handheld programmer you could find out if it already has a performance tune installed, it will not let you install any tunes if it already has one in there.
You could unplug the EBV wire, found underneath the exhaust flange right after the turbo before the downpipe.

kyguy076 · 08-03-2009, 08:26 PM

unhooked ebv wire didn't make a difference. I did find a couple wires runnin to the pcm. I think it has some type of chip in it. 3 way toggle switch connected. It was tucked under the dash. Gonna take pcm out tomorrow and see if there is a chip in it. Thanks for the help.

kyguy076 · 08-04-2009, 04:03 PM

There was chip in pcm. Removed it and the only thing showing now is #8 cylinder fails contribution test. Truck doesn't smoke. I don't think it would have a cylinder down. Is there any way to check #8 fuel injector?

haneydave · 08-04-2009, 07:29 PM

My truck had same codes, none ,feel your fuel line if it feels like it is bubbling check fuel sending unit in tank,it has a screen on bottom and inside it has two screens.There is three tabs on bottom with care it comes apart and screens come out they can be cleaned with solvent or brake kleen upon doing this my truck was like a different truck. three shops couldnt figure it out after changing fuel filter,fuel pump and fuel regulator (ouch it was expensive) i read about these screens plugging and pulled my tank myself and this fixed my problem for no cost but time.

kyguy076 · 08-04-2009, 09:46 PM

thanks for the info I will try to clean the screens tomorrow. HOPE IT WORKS

kyguy076 · 08-07-2009, 04:31 PM

cleaned the screens. No dice. I guess I will take it to ford and let them put their breakout box on it..$$$$$$

dieseldude73 · 08-07-2009, 10:49 PM

200k mi on a 9 yr old truck... the cheap fix would be a set of o-rings for #8 injector, but I'm guessin because you didn't have a code for "ICP < or > than desired", or "unable to build ICP @ crank", its just going to be a dead injector. Maybe the solenoid still works for the buzz test but the nozzle tip is plugged? These engines are fascinating (and frustrating)

kyguy076 · 08-07-2009, 10:58 PM

that would be great if it was the o-ring. my luck its a dead injector.