bugeye029

hi have a 2002 sti problem is the cars started hunting when its idling. usually idles at 500rpm tho its goin up and down then stalls, when i disconnect the MAF sensor it ideals fine tho at 1000rpm ,does it sound like my MAF sensors knackered ? plz help thanks

al02uk

iTrader: (1)

If I remember right, if your MAF sensor is working the car should stall when you disconnect it, it shouldn't continue to run.

Andy

bugeye029

would the engine not just take readings from the other sensors on the engine and keep it running tho at a higher idle?

al02uk

iTrader: (1)

No, it will just cut out, i've just checked mine outside

bugeye029

a also read on here that if u disconnect it the car can run off a map in the ecu to get by ? so what does that mean if my car wont idle correct but when i disconncet the maf sensor it runs alot better tho idles at 1000rpm any ideas?

Rice Rocket

iTrader: (23)

It could be your Idle control valve which sits on the trottle body.

Might need a good clean out, but make sure you get a new gasket before cleaning it with petrol. a new ICV is a fortune and gasket is about a tenner.

HTHS

S!

joz8968

iTrader: (13)

If you can temporarily rig up a voltmeter/multimeter to the MAF's electrical connector and run the meter in the car, then you can check the output voltages at idle and everything in between up to the rev limit. It should be about 1000-1100mV (1.0-1.1V) at idle and near 5000-5100mv (5.0-5.1V) at max revs, with in-between readings being proportional to the revs used.

bugeye029

av heard it could be the Idle control valve aswell a just hope its not done any damage to my engine tho, also thought the turbo sounded abit strange when spooling up not the usually sound tho a take it if 1 of the sensors is knackered it could affect the running of my turbo ?

scoobymikepic

iTrader: (3)

hi there,

mine been doing the same put in new maf, still the same found out it was the lamba sensor..
bought uni one, fitted it,,,, great now, hope this helps..scoobymike

cube320

I was told that the car does not need to stall completely. When i discconect my maf the revs drop (just about to stall) then revs back up to idle. Is this ok

bugeye029

have ordered a new maf sensor so hope this solves the problem and hope big time its not done any damage to my engine ,gonna clean the idle control valve aswell , if all that falls all try the lamda sensor

Rice Rocket

iTrader: (23)

Remember the gasket for ICV, i'm just waitng for mine to arrive.

S!

bugeye029

thats the new maf sensor fitted and still the same ! take it must be the idle control valve ?? when the car starts from cold it sounds fine just when it warms up and trys to idle it starts fluctuating sounds like the cars hunting then it ends up stalling ??

joz8968

iTrader: (13)

Coolant temp sensor?