Ford Mustang Forum banner
Status
Not open for further replies.
1 - 6 of 6 Posts

·
Registered
Joined
·
246 Posts
Discussion Starter · #1 ·
I would like to know if anyone knows what keeps the idle in a 89 mustang up until it is normal operating temp? Thanks
 

·
Super Moderator
Joined
·
40,152 Posts
it is the idle air control valve.you can take yours off and clean it to see if that helps.
 

·
Registered
Joined
·
246 Posts
Discussion Starter · #3 ·
I was wondering because I thought the iac. kicks in after the car is warm.
 

·
Registered
Joined
·
46,010 Posts
It's operating at all times, as far as I know.
 

·
Registered
Joined
·
941 Posts
th iac is on at all times
 

·
Registered
Joined
·
797 Posts
If I read your question correctly you are asking what makes the engine idle high until it reaches full temp. The computer runs in open loop when the car is cold to speed up the warm up process and to reduce emissions the computer makes the engine go to fast idle. When the engine reaches a certain temp the computer goes to closed loop and slows the idle and begins to take more input from the engine sensors . When the car is in open loop such as when cold this is the equivilent to when the car is fully warmed up and you floor the throttle because at this point the car also goes from closed loop to open loop for maximum performance. I hope I read your question right you may already know this info.
 
1 - 6 of 6 Posts
Status
Not open for further replies.
Top