Work Horse throttle response correlation issue

Discussion in 'UPS Discussions' started by Mechanic86, Apr 3, 2015.

  1. Mechanic86

    Mechanic86 Repairing the crap you break.

    Any mechanics have the great luck of coming across this issue from one of the 6.0 GM Gasoline Work Horses in your fleet? Accompanying this code is an intermittent loss of power under acceleration which I was never able to replicate no matter how many times I drove this vehicle yet the driver constantly would write it up then we'd red tag it and try to diagnose/repair it. It seems we finally found the problem and its been running its route for the last few weeks without issue. Apparently the wiring under the dash was being affected by radio interference and all the wiring harnesses had to be wrapped in EMI tape and that solved the issue. I know there's more of these vehicles out there and was just wondering if anyone came across this issue also?
     
  2. Wally

    Wally Hailing from Parts Unknown.

    I sure hope they can tape over the beepers too under there to quite them some.
     
  3. UpstateNYUPSer

    UpstateNYUPSer Very proud grandfather.

    Try lowering the dash lights brightness level. The sliding switch is to the left of the steering wheel.
     
  4. Brownslave688

    Brownslave688 You want a toe? I can get you a toe.

    That's interesting. Was it basically delayed response upon starting from a stop?
     
  5. oldngray

    oldngray nowhere special

    I had a Workhorse that would hesitate like that. I don't know what the mechanic did to fix it but it was a chronic problem I had to write up several times before it got fixed. Workhorses are total POS trucks.
     
  6. Jackburton

    Jackburton Gone Fish'n

    Mechanics have been instructed to screw plates below the slider to prevent this. The problem arises leaving your lights on all day, it's apparently burns out the wiring harness for the front end lights. This is straight from a mechanic I asked to remove a plate off a fellow drivers vehicle.
     
  7. Mechanic86

    Mechanic86 Repairing the crap you break.

    Seems that the signal from the throttle position sensor on the throttle body and the signal from the accelerator pedal position sensor were not matching up when compared by the ecm only occasionally due to interference so under the right conditions the truck would bog down hard and throw this code which could be bad if you were in an intersection or some other situation where u needed to get moving asap.
     
  8. Overpaid Union Thug

    Overpaid Union Thug Well-Known Member

    I drive one of the newer automatics that looks almost like a 1000 but is apparently an 800. All of those trucks in my center will of occasionally fail to go into gear after taking them out of park and the dash says "shift inhibit.". Everyone knows that if you throw it in drive, or into reverse from drive, too quickly while disengaging the parking brake and try to accelerate this will happen. Only it's happening for no apparent reason many times. It frequently happens when I slowly go throw the process of going from park to drive. Our mechanic thinks we are all just trying to come out of park to fast but that just isn't the case. I was hoping one of the mechanics in this forum might know what's up.
     
  9. Brownslave688

    Brownslave688 You want a toe? I can get you a toe.

    You have to make sure the brake is fully engaged.
    Shift inhibit sucks
     
  10. Overpaid Union Thug

    Overpaid Union Thug Well-Known Member

    I've tested that to check. I had the brake to the floor and it still happened. Seems so random.
     
  11. UPSmechanicinblue

    UPSmechanicinblue Active Member

    Biggest think with the shift inhibit is if you have any engine lights on or problems the car idling high it has to be at a complete low idle before being shifted into gear.
     
  12. upsmaninmi

    upsmaninmi Member

    Hold the brake down before you shift into drive. My truck is in the shop and I've had one of these POS for a couple weeks. I'd almost rather have an old no power steering POS. Almost.
     
  13. Overpaid Union Thug

    Overpaid Union Thug Well-Known Member

    I actually like the truck. Just not the shift inhibit problem.
     
  14. upsmaninmi

    upsmaninmi Member

    To each his own I guess. I have a p1000 from the previous body style. Turn radius is great, has huge balls, overall much more comfortable in my opinion. Been driving it since it was new so I'm sure that has something to do with it.
     
  15. Overpaid Union Thug

    Overpaid Union Thug Well-Known Member

    Mine looks like its somewhere between an 800 and 1000. I have been told it's an 800 though. It handles pretty well in the rural areas too. Now if I can just stop the shift inhibit and all of the beeping from the dash!