had problem with my truck randomly sputtering like it wasnt getting any gas. replaced fuel pump,fuel filter,and rotor cap. fuel pressure good {20}. still sputtering. then i pulled the vacum hose on the air filter because the flapper was closed.runs little better but what is the relation with the vacum causing the flapper to close and not let air into the carb. is it a tranny issue ?
Q&A
Ask Your Question1991 Dodge W250
Question: is my tranny tied into the vacum system {at carb air intake}?
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Answer #1
dandd February 05, 2012, 20:39Reply
MasterActually this truck has throttle body injection that is mounted in what looks like a carb. The flapper is for when you start the engine in very cold weather, it directs warm air into the intake so the air and fuel can blend and burn better. However, the flapper or ( thermostatic air cleaner ) needs to be open once the truck has run for awhile, or the engine will run poorly. The thermostatic air cleaner uses vacuum to operate the door.
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