Lacking Power

[jjrowan]

I purchased a 1998 Gulf Stream Sun Voyager today. It has a 5.9 liter Cummins Diesel with Allison 4 speed transmission. The test drive the owner took me on was about 20 miles, since I didn't drive I couldn't tell whether it was being floored or just cruising. After purchasing it I got it onto the highway and was disappointed that it lacks power. I made frequent use of the four way flashers going uphills. I didn't try shifting from 4 to 3 as I wasn't comfortable downshifting something I wasn't familiar with. Pressing the accelerator pedal all the way to the floor didn't cause a downshift. The prior owner said they'd replaced the "kick-down cable". The air filter was just replaced so it shouldn't be a factor. I had planned on towing my 2007 Trailblazer from New Jersey to Maine but the lack of power makes me think it won't handle the tow. I'm looking for anything to get more power out of the 5.9.

[crasster]

RFCN2 wrote:
Take it to cummins and have them put it on their computer before you do anything else.

I agree. They'll be able to tell what is going on with that diesel.

[RFCN2]

Take it to cummins and have them put it on their computer before you do anything else.

[wirenutz]

I had a 5.9 in my old first gen. Dodge, it was rated at 180HP to get a few more ponys out of it I straight piped it, it helped some, it sounded cool as well