M A F mass air flow sensor ?

[tillerjoe]

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

[jeff84red]

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.

[tillerjoe]

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.

[Dr98]

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

Dean

[tillerjoe]

Originally Posted by Dr98

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

Dean

OK. 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 !

[way2old]

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.

[tillerjoe]

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

[way2old]

Way to go Dean. Good call.