During the past two weeks my truck has developed an intermittant dead pedal. I cycled the ignition key three times but no codes appeared other than 0500 (speed sensor). The speedometer and tach both work fine. Fuel pressure is 14-15 @ idle and 13 @ cruise. I'm wondering if the APPS can be malfunctioning despite no codes being shown. The dead pedal events are very short in duration the last being yesterday on the freeway. I was cruising at 65 mph and tried to accelerate but the truck wouldn't go any faster. This situation lasted maybe 4-5 seconds then it responded.

 

when it does it again keep foot on pedal while cutting key off and then back on real fast if picks up and takes off ,get ready for inj. pump

 

the code doesn't always show on the odometer.. you need to get a code reader and take a look.

generally it's one of a few things..bad filter, bad lift pump, bad apps, or bad vp44.

 

I had the same problem,I suggest doing a mild apps reset,turn off truck,turn key on,push & return pedal slowly to floor once, turn key off and start truck and go.It will be fine for a few days maybe longer,if this does temporarily fix the problem then I would say it's your apps.
Ken

 

Hi there - new guy here just throwing in my 2 cents. I have had similar problem with dead petal, very intermittent. Read alot, and talked to 2 diesel mechanics from dealerships that assured me a bad apps will set a code for you. Not trying to diagnose for you, but sometimes a board problem - usually when it gets hot, can also mess with your advance and create a "dead petal". This is a known issue on the VP44 and Bosch has since made improvements on the rebuilds to address.

 

I want to thank everyone for the replies. My truck has this intermittant dead pedal even when the engine is completely cold. It happens a lot when I first leave the house in the morning. I have ordered a OBDII code reader and should have it next week. We will see if there are some codes on the PCM and/or ECM that are not showing up in the odometer window.