techno_brat

iTrader: (5)

Hi all, sorry for the long post but I was hoping for a little help/advise, I have a widetrack STI recently mapped by Duncan and all is well apart from the other day the car idled badly when cold and then kept stalling at idle until fully warmed?! since then all has been well, but I have been playing around with a OBDII reader I have linked to my phone and noticed something odd, with the ignition on but engine off my MAF is reading 1.9 grams/sec and when running at idle it fluctuates from 2.9-3.3. Does anybody know if this is normal or should it read 0 g/s? I have plugged in my Suzuki Grand Vitara and this reads 0 g/s with the engine off but my dads 03 STI reads 3.3 g/s with the engine off so i'm a little puzzled. Does anyone know what it should be or can someone check thier OBDII reader to see what it is. Oh and one other odd thing is the throttle postion percentage, throttle closed reads 11% and WOT reads 76%, but my dads STI reads 0% closed and 100% WOT, please help lol.
Many thanks

bluenose172

iTrader: (2)

The MAF readings are 100% normal. The throttle isn't normal though, never seen that before. You may have an issue with the IACV with the rough idle and stalling.

techno_brat

iTrader: (5)

Hi bluenose, thanks for that, yeah I wasnt sure on the MAF in the impreza if its normal to have a g/s reading when its not running, does yours too? It was only mapped a month ago so i assume it's ok as Duncan would of picked up on it. ref the throttle sensor- I have bought a used one to try, maybe this with a sticky IACV caused the problem, I have taken the IACV off and cleaned it so its all free moving now so will see how it goes.

techno_brat

iTrader: (5)

Not that I dispute bluenose and thank him for his help but was just wondering if anyone else had any thoughts or experience on my OBDII readings? or reading from your own cars out of interest :-)

bluenose172

iTrader: (2)

I've only yesterday scaled a 70MM APS CAI on my WRX and remember seeing the same G/S readings with the engine off, that's why I know it's ok.

techno_brat

iTrader: (5)

Oh right thats handy then :-) seems odd but hey ho, IACV is back on with new gasket, will see how it goes, then fit the TPS the weekend