I have a 2000 24 valve 5.9 diesel in a 1 ton pickup....automatic tranny and I just put in a new TPS, fairly new VP 44 pump...new in-tank fuel pump....I just replaced the injectors which are high performance type....been running those for 4 years....I was a bio-diesel distiller and one of the old injectors was bleeding and making me smoke at tailpipe.....the story

I have great power and always have, but in the last year I got a dead pedal but can't go any faster...even with the new TPS...I also had a crankshaft sensor code at the same time as the TPS code...but the Crank sensor code went away and no longer comes on.

I can run like the devil up to 65-70 miles per hour, then it is like I hit a brick wall.....I do not have a code with this problem...the truck was doing this same "dead-pedal" as now but has new TPS.....I just don't want to throw money at the issue...any help out there...
could the automatic tranny be the issue..???

 

Welcome to the forum.

A few things to understand first off to better help..... Exactly how old are all the parts you mentioned and how long have they been installed? Meaning, a "fairly" new VP can mean many different things, and an old worn out PSG on the VP is the main cause for dead pedal.

But that said, what is the "dead pedal" like you're experiencing? Is it just a lazy pedal, lack of throttle response, or lack of power, because the real definition of dead pedal is when there is zero response from the throttle. Meaning.....you'll be driving along and you try to increase throttle but nothing happens like there is zero communication between the throttle pedal and the VP. During that brief moment the engine will maintain its current speed and load during that complete lack of response too. You either have to come back to that original position in the throttle or all of a sudden the engine will respond to the now different throttle position and you'll begin to accelerate.

Also, its worth pointing out that another main reason for APPS response problems and PSG issues is the alternator AC voltage. If the alternator is generating more than about .02 at idle and .1 voltage at 2000 RPM with all electrical components on high, measured at the alternator then it can cause interference with the surrounding sensitive electrical components, like the APPS and PSG.

 

I have the exact problem on my 01 4x4. Changed my TPS sensor and still killing on me at high speeds and sometimes cruising. Deff does it under load. Just ordered new fuel filters for my fass pump and hoping it may be it. Any luck on your problem?