sheikss

iTrader: (11)

I got a 2007.5 NBS 2500hd with the 6.0 and 6 speed auto. The truck has a low speed surge when the engine is under load. If your cruising down the highway with the cruise set and you hit a hill you will feel the truck surging roughly 200-300 rpm, once it down shifts it stops. It also does this during light acceleration sometimes. I have hptuners and have no real clue how to tune. My question is, is there something in the pcm that I can change to fix this?

sheikss

iTrader: (11)

No one? I have logged it and looked for codes and found nothing out of the ordinary. Thats what makes me think it's tune related.

vaticano

iTrader: (8)

It's the ETC opening and closing. My 1500 does the same thing. Don't think there is much you can do to stop it. Although, I never tried to stop it either. Any change would likely be in the cruise control tables.

sheikss

iTrader: (11)

Thanks you.

G8-4-speed

iTrader: (1)

Are you STFT while scaning have large +/- swings? Have a seen too much proportial fuel for close loop O2 oscillation cause surging at low speed.