High idle?

MARKRIOJAS968

MEMBER
7 POSTS
1991 CHEVROLET S-10
4.3L
V6
2WD
AUTOMATIC
23,182 MILES

When I hook up vacuum line from TBI to PVC valve truck runs at a high idle.

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Wednesday, January 20th, 2021 AT 7:33 PM (Merged)

ASEMASTER6371

MECHANIC
52,796 POSTS

Good morning.

Have you replaced the PCV valve? Its job is to remove vapors from the crankcase and send them back into the intake system. If the valve is stuck open it will do this.

Roy

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Wednesday, January 20th, 2021 AT 7:33 PM (Merged)

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