Hey all I have a 1991 blazer auto 4x4 4.3 that is driving me nuts. When you
start the engine cold and drive off it has a mid range rattle. stop the
truck and the rattle goes away. It only rattles while you drive and its
consistant with the rpms. Im thinking it could be the rockers hammering but
if it was the rockers then wouldnt they hammer at idle while the trucks in
park?
What is confusing me is the fact that it only rattles when the engine is
cold and in gear.
So far I have gave it a tune up, changed the oil (the sound changed its tone
after the oil change, which leads me to think that it may be the rocker
arms) and replaced the TPS (thinking maybe timing/fuel issue)
ANY AND ALL Ideas would be greatly appreciated
Thnks
Steve