Join Date: Apr 2001
Location: eustis , Florida
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Re: Idle Surge on a 88 Xlt
The IAC or as i mentioned beforehand as a IABV (idle air by-pass valve), is mounted to the side of the throttle body, a long cylindrical aluminum piece with two wires going to it. it adjusts the idle air flow by means of a servo motor moving a pintle valve. If it plugs up or the motor isnt operating smoothly, it cannot stable the air /fuel mixture fast enough for a constant idle speed. Other factors can cause the same effect with fords speed density injection system: high mileage engine wear,timing chain off a tooth or badly worn, vacuum leaks, improperly adjusted throttle body plates to mention a few, none of which would throw a trouble code.
extended crank??? WTF!
BTW, yes those oil pressure guages are notorious for that.
Kemicalburns, where did you hear of *brakleen* removing a coating from the throttlebody???
sure your not speaking of carb cleaner which is extremely potent?
Im not suggesting that i dont believe you, but i didnt know that this particular TB had ANY coating, unless its just wax, it just appears to be plain aluminum to me, and i have never seen anything wipe off on the rag , would it make a difference if its *chlorinated* or *non-chlorinated* brake cleaner? The stuff i use at work can barely remove the cheap paint off a crapsman toolchest... anyhow, it has always ran *much* better afterwards....