2002 mustang gt idles at 2krpm

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My car was running good before i checked all the condition of all my plugs. After everything was put back the idle is stuck at 2k rpm and hangs real bad between shifts. I am getting a p1506 idle overspeed enginelight too. I used brake cleaner to try to track down a vacuum leak witb no luck. I replaced the iac with no luck as well. When i disconnect the iac rpms dont change.
 
Check the condition of your throttle body for shaft play or carbon deposits causing it to hang open, especially if you had to mess with it during your plug check.
 
Our instructor always told us, call a technician....18 months of HVAC school. we could fix anything after that....
 
Originally Posted by racin4ds
You have a large vacuum leak and have disturbed something likely while changing plugs. Keep looking, you'll find it.


This. This is the most likely issue.
 
Originally Posted by daemontrym
My car was running good before i checked all the condition of all my plugs. After everything was put back the idle is stuck at 2k rpm and hangs real bad between shifts. I am getting a p1506 idle overspeed enginelight too. I used brake cleaner to try to track down a vacuum leak witb no luck. I replaced the iac with no luck as well. When i disconnect the iac rpms dont change.


Please do not use brake cleaner to check for leaks, some of them are poisonous when burned and can damage some plastics. Carb cleaner is the correct choice.

Rod
 
Bikes have horrible aerodynamics. IN a straight line, from zero if the rider knows how to launch, bike will win up to 100 or so, then the aero starts hurting them.

Braking you loose, and turning you really lose, no bike can ever get even 1 G the Vette and the Porsche both can.

Rod
 
Originally Posted by ragtoplvr
Bikes have horrible aerodynamics. IN a straight line, from zero if the rider knows how to launch, bike will win up to 100 or so, then the aero starts hurting them.

Braking you loose, and turning you really lose, no bike can ever get even 1 G the Vette and the Porsche both can.

Rod


What does any of this have to do with the OP's issue?
 
Did you forget to hook up one of the vacuum lines you probably removed to change the passenger side plugs? Or disturbed something so it no longer seals tight?

My XTerra ran super rough and stalled a few times after I finished replacing the timing chains, imagine my relief when I realized I left the MAF unplugged!
 
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Did you Clean the throttle body, including the bore which the IAC solenoid resides of carbon buildup? Also check around the manifold vacuum tree for any broken vacuum lines which may have gotten disturbed while changing plugs.
 
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