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My Econoline 250 with 4.2 lost fluid from hose leak, fixed leak everything was normal for 3 days till I drove it on highway. When it went into overdrive lost forward power. Turned off OD and did ok for a while. Lost forward gears slowly, put in fluid, hard to tell when full. Reverse is fine but have to rev up engine to get forward to engage, then everything is fine at lights and such till take out of drive, then have to rev engine to about 2500rpm to engage drive. Help?
It may be the transmission, check the transmission fluid level first. will the engine rev up if you were to step on the gas pedal while in park, does engine rev and sound strong or is it slow and straving for power?
what color was the fluid, does it rev up & not move is ther a check eng light on & is the dipstick full with eng running? if the filter fell off in pan it will **** air you might try over filling it by 2 qts to prove this. note this is computer controled all except reverse if no reverse its internal in trans. is there any chance an axle poped out if it holds in park that is ok & not a factor.
Will it move forward in manual low? Try unplugging the plug above the vacuum modulator to lock it in 3rd and see if it moves. Either way the transmission will need rebuilt but at least one of these might get you moving.
Buick 1999 Century..strong gasoline odor will driving or stopped.
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