The IAC is a common problem on these anyway, get a can of spray Throttle body cleaner, spray the vac lines and maniflod area, when the idle changes, youve found the leak! You want the engine running and spray on the outside but do direct the stream onto the hoses, if it is a vacuum leak, the engine idle will change speed, then you have detected a leak, repair the vacuum leak and see how it runs! If that doesnt do it, you may need a new idle air control valve, it's bolted to the throttlebody
Clean out the throttle body too. Do it with the motor off, and use a rag to wipe the carbon off with the tbi cleaner. If this has the electronic throttlbody, there is no IAC. Clean the throttle body, it may work, taking it off to clean will yield better results! Ford states these throttle bodies are not to be cleaned. Think Toyota here. Electronic throttle control is tricky stuff, NASA is involved with figuring out Toyota's problem, so you really do need to be a rocket scientist nowadays! BTW which engine does this have? 4.6, 5.4? Be advised, using cleaners not meant for throttle body cleaning WILL KILL etc throttles. If it stalls at idle, but runs good, it's probably the electronic throttle actuator.
Friday, April 23rd, 2010 AT 1:45 PM