What is your question?
·
turn off ac.rpm goes up
What makes this problem better or worse?
no
How long has your 1998 Ford Mustang had this problem?
1 day
Visitor
Sep 8, 2019
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1 person has answered this
1 Reply
Idle Air Control valve (IAC) or IAC circuitry malfunction.. Professional scan test recommended - scan tool capable of functional testing.
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‘Possible’ vacuum leak - however the posted symptoms lean more toward an IAC valve operations error.
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‘Possible’ vacuum leak - however the posted symptoms lean more toward an IAC valve operations error.