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monkey44's avatar
monkey44
Nomad II
Feb 21, 2014

acceleration issue

Been driving a couple new trucks ... all three seem to have an acceleration issue ... a hesitation from dead stop, and if you "punch it's on the highway about 70ish ... all three (Ford 250 6.0 Gas and GMC 2500HD 6.0L Gas) and it's like it takes a pause and then accelerates.

My 2003 GMC 6.0L has never done that, and still doesn't. When I tap my pedal, it jumps right out there, no hesitation, no pause - andit leans you right back in the seat if I want it.

SO, what's with that -- it's a definite pause ... so much so, at the 70ish speed, the truck almost 'dipped' and then accelerated.

I'm wondering if it's just a computer delay, while it send signals, but that makes no sense - computers are instant relay a signal.

If one truck, I could imagine just a miss - that's what it feels like, a miss spark signal ... almost a misfire, although it's only a feel, it's not a sound, no backfire - just the delay.

It's a second or so, but definite, very definite. No doubt in my mind. And all three brand new trucks ... very puzzled Monkey ...

22 Replies

  • Was it a Ford 6.0 Diesel or a 6.8L gas?

    If its the diesel, some turbo lag is normal, but it can get worse if things are running right. If it's the V10, its probably low fuel pressure which means the PCM has to compensate by adjusting the injector timing. In other words, not normal. I would expect the GM 6.0 to be the same.
  • New vehicles do not use a throttle cable they use an electronic gas pedal that sends a message to the computer that sends a message to the rest of the vehicle. There is a delay between stepping on the pedal and acceleration. Could be that. Or, you didn't mention if there was a turbo charger involved. There is a thing called turbo lag. From the time you hit the pedal to the time the turbo spins up creates a lag. Could be that. Or, it could be both.