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richardndawnc
richardndawnc, ASE Certified Technician
Category: Chevy
Satisfied Customers: 187
Experience:  ,Service manager for 14 years, Shop Owner
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TRUCK DIES WHEN PUT IN REVERSE OR DRIVE

Customer Question

TRUCK DIES WHEN PUT IN REVERSE OR DRIVE
Submitted: 5 years ago.
Category: Chevy
Expert:  richardndawnc replied 5 years ago.
hi and wecome

may I ask what type of vehicle you have?
Customer: replied 5 years ago.
CHEVY TRUCK 4X4 350
Expert:  richardndawnc replied 5 years ago.
what year?
Customer: replied 5 years ago.
1988CHEVY TRUCK4X4
Expert:  richardndawnc replied 5 years ago.
ok-
may I ask what all have you tried so far?
Customer: replied 5 years ago.
REPLACE THROTTLE POSITIONING SENSOR,REBUILT THROTTLE BODY,REPLACE SOMETHIN ELSE ON THROTTLE BODY BUT CANT REMEMBER NAME..SORRY
Expert:  richardndawnc replied 5 years ago.
does the truck have a tachometer in it?
Customer: replied 5 years ago.
YES
Expert:  richardndawnc replied 5 years ago.
where is it idling when in park? (RPM)
Customer: replied 5 years ago.
1000 TO 1200
Expert:  richardndawnc replied 5 years ago.
wow, that is way too high, have you removed the idle screw plug in the front of the throttle body
Expert:  richardndawnc replied 5 years ago.
graphic
Customer: replied 5 years ago.
YES I HAVE I CAN KEEP IT RUNNIN WITH MY FOOT ON THE ACCELERATER WITH THE TRUCK N DRIVE BUT AS SOON AS I TAKE IT OFF THE TRUCK DIES
Expert:  richardndawnc replied 5 years ago.
back the screw down to 650-700 RPM, if it will not run or back down at all then you have a vacuum leak somewhere, the best way to check for a vacuum leak if you can not hear a high pitch whistle, is to take a can of carb cleaner with the straw attached, spray around the base of the TBI unit, all the vacuum lines and hoses, the egr valve, and the intake to head gasket surface, it the engine revs with the spray on any of these spots, then you have a leak , and this is the cause of the problem, if you can not locate a leak from doing this, then look at all the vacuum accessories, like the brakes ,cruise control unit, etc..... some were you have a vacuum leak and the problem is just hunting it down.
Customer: replied 5 years ago.
OK THINK YOU VERY MUCH
Expert:  richardndawnc replied 5 years ago.
no problem - just please remeber to accept my answer, this will not close the question, just allow me to get credit for my work

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richardndawnc
richardndawnc
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,Service manager for 14 years, Shop Owner