Originally Posted by
6.5_Diesel
On the trip down camping, I still had the defueling/boost surge issue when I got between 60 and 55 mph (in 5th gear), so when I was at the camp ground I threw in the new boost solenoid I had to see if on the way home it would still do it. It still does the defueling/surging when I hit just the right speed ranges in both 4th and 5th gear. I have a new boost sensor that I am going to try, but after that I am out of ideas on what it could be.
I'll mention again what I did to my '95: I removed the vacuum pump and associated plumbing, installed a Turbo Master wastegate control, and Kennedy Diesel's chip in my ECM. I've never had a defueling problem since, and I can drive by the EGT gauge now. These upgrades made a tremendous difference in the towing capability of my rig.
Casey
1995 K1500 Tahoe 2 door, 6.5LTD, 4L80E, NP241, 3.42's, 285/75R16 BFG K02's; 1997 506 block; Kennedy OPS harness, gauges, Quick Heat plugs, and TD-Max chip; Dtech FSD on FSD Cooler; vacuum pump deleted, HX35 turbo, Turbo Master, 3.5" Kennedy exhaust, F code intake; dual t/stats, HO water pump, Champion radiator; Racor fuel filter