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gerald lee

gerald lee 5/17/2012

1992 Buick LeSabre Limited 6 Cyl 3.80L

Engine

why does my cut off when i come to a stop?

i have a 1992 buick lesabre and when im driving everything is fine until i come to a stop sometimes.

1 Answer


CVO

CVO 5/18/2012

See this
GM Bonneville/Eighty Eight/LeSabre 1986-1999
Engine idle speeds are controlled by the PCM through the Idle Air Control (IAC) valve mounted on the throttle body. The PCM sends voltage pulses to the IAC motor windings causing the IAC motor shaft and pintle to move in or out a given distance (number of steps) for each pulse (called counts). The movement of the pintle controls the airflow around the throttle plate, which in turn, controls engine idle speed. IAC valve pintle position counts can be observed using a scan tool. Zero counts correspond to a fully closed passage, while 140 counts or more corresponds to full flow.


Idle Air Control Valve
OPERATION
TESTING
REMOVAL & INSTALLATION

http://www.autozone.com/.../...rGuideContent.jsp

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