HI, i have a 1999 impreza sti v6 - i went to go to the shops earlier and the check engine light came on. The revs are up and down on idle and want to cut out if i put my foot down it wont rev past 4k when drivingand the check engine light has stayed on . is there any way i can manually read the fault or does anyone have any idea whats going wrong .I had no problems ever uptill today and really need my car on the road if anyone can help i would appreciate it no-end

 

Is your speedometer needle working okay?

 

It wont rev past 4k because its in limp home mode due to the cel coming on. Possible idle control valve problem, try removing the valve and cleaning it out with carb cleaner, worked on mine when my cel came on. Although mine is a V2?, so maybe different.

 

ill go check the speedometer right now and could you tell me where the icv is located, IS it possible to read the codes or is it a specialist job for facelift classics

cheers for replys btw

 

speedometer works as it should light gone off but just wants to cut out on idle

 

Scoobypedia | Trusted knowledge for everything Subaru | Knowledge / Reading ECU Fault Codes

 

i done the test , and 2 long flashes followed by 3 faster flashes . Im thinking this is the maf sensor, is there any chance of damage being done ( wasnt driving the car fast or aggresiveley) just driving normally and light came on and hasnt been the same since, which maf sensor should i buy???

 

your car is v6 so it has a stepper motor not an ivac so forget that one!!! the symptoms you have described sounds like maf fail and you have confirmed this by error code 23 get replaced asap best not drive the car

 

you have the type of maf that can be removed from its pipe and can be had for around £80 even from the stealers/dealers

 

i wont drive her , i have a van aswell so can use this to pick up parts. Im slightly confused as to which sensor in particular i need?? Thank you for all the help guys i really do appreciate it my cars very special to me and panic sets in very easily

What eventually will happen with maf fail will it cause detonation / lean running and failure?? not that i would use the car now i know whats wrong

 

correct!! the part can be found via your vin no/reg.. at the dealers

 

a friend has a spare he has offered me its brand new and was for a my00 p1 . ill get the numbers checked for compatibility but it would save me a fortune and let me spend the money on a treat for the car

 

Yes, certain the MAF has failed as per the fault code. It's relatively common on the MY99/00 cassette fragile hot-film ones... But you can double-check/confirm by testing its output voltage range - see here:-

https://www.scoobynet.com/general-te...-problems.html

 

makes sense , well im going to get under the bonnet tomorow and get her the parts required to fix . thanks again for all the info and would the p1 maf be the same as there both facelift classics

 

Yes, P1 stared life as a Type R STi Version V (MY1999) and was modified by Prodrive/STi for the UK market. So yes, it has the later MY99/00 fragile cassette MAF

 

Thanks for the help guys replaced the sensor this morning (1 of th screws is knackered) reset the ecu and bingo , runs like a new car idleing great and performance to match

 

Brilliant!

Fantastic when the plan comes together, what!