1997 GMC 1500 Pickup Q&A
1997 GMC 1500 Pickup Question: High pitch whine heard when slider window open while driving. Poss. fuel pump??
Truck has a camper shell and sound comes up btwn the cab/box/camper shell. Was making the whine at 55mph from new for several years. For the last 10 months it happens at 55,60,65,70mph; but much louder. Can hear pump come on when ignition turned on; truck starts everytime; no loss of power on acceleration, 105K miles on truck. Always did it before at 55mph; now it's intermittent. What else could make this whine; rear end; drive shaft; transmission?? - rollyhills
poss dry u joints or any of the things you mentioned. if you can't find it seek diag and est - globalhelper
have the same code on my truck gmc 97 it is because the cat converter is off mine and the code cant be cleared it will show a number 6 cylinder misfire as a result but its no big deal - kat1962