Where is the MAF mass air flow sensor located and how do you clean it:nono: ?

What year, engine size? Normally they are located between the airfilterbox and throttle body. My 1994 4.0 has it down near the airbox. Diconnect the senor connector carefully, remove the 2 compression clamps and remove the MAF. Look on the screeen side to the small orifice. Use a quality cleaner for carb/TB's and spray inside this orifice. That should do it for you. Be carefull not to crack the plastic intake tube as it will cause other issues.

YEAR is 99
engine size is 4.0
am I correct here on this causing a high pitched whistle at idle, or should i be focusing my thoughts elsewhere ?
when the engine is reved up the whistle stops.

It is probably your IAC valve making that noise. It controls your engine idle speed.

Dean

It is probably your IAC valve making that noise. It controls your engine idle speed.

DeanOK. Is there a way to service the IAC valve ? such as cleaning it ? and where is it located ?
thx people !
keep the suggestions comming. this whistle is driving me looney !

The IAC is located on the throttle body, It is a round silvery looking culinder about 4 inches long and 1 1/2 inches in diameter. There is a hose going to it and one electrical connection. It is held in place by 2 small bolts. Easily cleaned. Just remove and use a cleaner that will not deteroriate the rubber parte inside.

Thanks, that was it, cleaned it no more whistle. Hats off to ya

Way to go Dean. Good call.