Close
Engine racing slow to return to idle
1998 Ford Mustang

Engine racing slow to return to idle

(1998 Ford Mustang)
turn off ac.rpm goes up
What seems to make the problem better or worse? no
How long have you had this problem? 1 day
Tags: ford, mustang
1 answer & 1 comment
Popular Answer
on September 08, 2019

Idle Air Control valve (IAC) or IAC circuitry malfunction..

Professional scan test recommended - scan tool capable of functional testing.
Sign in to reply
on September 08, 2019

‘Possible’ vacuum leak - however the posted symptoms lean more toward an IAC valve operations error.
General Diagnosis
$88 - $111 Learn More
on September 08, 2019

Idle Air Control valve (IAC) or IAC circuitry malfunction..

Professional scan test recommended - scan tool capable of functional testing.
Sign in to reply
on September 08, 2019

‘Possible’ vacuum leak - however the posted symptoms lean more toward an IAC valve operations error.

Similar Questions

View answers to similar questions from RepairPal's community of auto experts and enthusiasts.
The car starts, and idles, will drive at idle speed. no fuel disruptions, bad timing, misses nothing. but will not...