Jumpy Idle
#1
Jumpy Idle
99 Mustang GT, 5-spd
When I come to a stop at a red light, the idle is fine, right around 800. After a couple seconds, it dips down to around 500, then back up to 800. This was annoying and slightly concerning before, but I've recently performed the IAC rev mod (https://mustangforums.com/m_2625353/tm.htm). I've since have the revs drop below 500, and the car's even died a couple times (fires back up no problem).
The behavior is similar to a radiator fan kicking on, only much more extreme. Any ideas on what this is, and how to correct it? I'd love to keep the mod, as I love the sound and nature post-mod.
Thanks guys!
When I come to a stop at a red light, the idle is fine, right around 800. After a couple seconds, it dips down to around 500, then back up to 800. This was annoying and slightly concerning before, but I've recently performed the IAC rev mod (https://mustangforums.com/m_2625353/tm.htm). I've since have the revs drop below 500, and the car's even died a couple times (fires back up no problem).
The behavior is similar to a radiator fan kicking on, only much more extreme. Any ideas on what this is, and how to correct it? I'd love to keep the mod, as I love the sound and nature post-mod.
Thanks guys!
#5
RE: Jumpy Idle
So while this may be a common problem, I have a hard time imagining that this is supposed to be. What/where is this idle air control valve, and how do I test it? Is there some other reason for the drop in RPMs?
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