subaru impreza 2001 wrx awd

[jame5evan5]

hi ive recently bought a 2001 subaru impreza wrx awd...the engine management light has come on.i had it put on the computer and the code it came back with was p0172...cud any 1 please help me with what i shud do..it feels like it is running a little rich because when its ticking over the revs drop below 1000rpm and nearly stalls but then shoots back up.there is definately a flat spot ..cud any 1 please giv me any advice wot i cud do...thanks

[SD_GR]

the code it came back with was p0172...it feels like it is running a little rich

The ECU thinks it's running rich also. List modifications and service history.

[jame5evan5]

i know it has a pro drive pack...and had all the regular services..im new to driving 1 of these and the maintaining of 1 so any help would be much apppreciated

[jame5evan5]

as i said any help would be most greatful..thankyou

[SD_GR]

Either the ECU is running the wrong map or there is a problem with fueling and the car is running rick. Check
02 sensor
MAF sensor
Check all vacuum hoses at intake system.
PCV system
Throttle body
IAC (idle air controller valve)

If you have an aftermarket dump valve swap in a stocker and see what happens.

[jame5evan5]

is the maf sensor near a big air pipe cos i unplugged it today while the car was running and it just cut out..if not how will i know if it is the maf sensor..as i say im just learning about these cars..what would the 1st thing be best te chek?

[SD_GR]

The MAF sensor is on the air inlet and has a harness clip attached to it. The harness should face forward. Run down the list above methodically or take it to a specialist, preferably one that sells/installs Prodrive kits. I assume you are UK? Try scoobynet.co.uk for local help.