afternoon all i have a classic wagon wrx no known mods apart from 3.5 inch exhaust. Problem i have is when the car is warm it revs up and down had a code it was iacv so got one off tinternet fitted it but it still does it. check engine light still comes on but it goes off when the car isat a stand still. One thing i have noticed is that if i pull the pipe from boost solenoid it goes away has anyone had this problem before or does im close to tears

 

have you tried cleaning you boost selluniod with some brake/carb cleaner also give the maf sensor a clean to see if that helps

 

Have you reset the ECU after fitting??

Cheap replacements don't always do the job either

 

which bit of the solenoid do you clen because there is a few bits and bobs down there. yep i reset the ecu if cleaning the solenoid dont cure it then i may have to by a new iacv

 

may have found something noticed on my secondary air box that the plastic pipe has snaped and there is a loose air pip. it dont seem to be sucking but it does go to the solenoid could this be causing me to go bald

 

connect the green connectors under dash, turn on ignition and take the vac pipes off the boost sellunoid then squirt the carb/brake cleaner in to the ports, top one mainly but do the other two to just for good measure

 

that will probably be your problem, that need to be connected to your resinator so the boost selluniod knows what air is going into the engine. with that not connected it usaly causes over boost

 

great stuff cheers for that is this common for it to hunt when the boost solenoid is clogged

 

sweet jesus so will this be the reason why it throws up iacv

 

it more likely to be the snapped vac pipe thats causing the hunting problems, its good idea to clean the boost selluniod from time to time because they do get crap in there

 

dude your the man

 

hope you get it sorted

 

It's more important to block the hole on the resonator than to connect the bottom pipe from the BCS, dirty unmetered air will be being drawn in to the air inlet, it is ok (ish) to let the bottom pipe vent to atmosphere for now, until you find a way of reconnecting, use a brass plumbing connector threaded into the airbox and push the pipe back on

edit, the pipe will blow, not suck, the hole will suck

 

my pipe came off a while back when i put my decat pipe on and it was over boosting like ****, might just be my car tho

 

going get a new box local scrap yard has got a scooby

 

Good move

 

got new box and cleaned boost solenoid but it still hunts and now i have cleaned boost solenoid its coming up code 42 please i aint got much hair left now. Also when im coasting the check engine light comes on then goes off when i come to a stand still

 

Code 42, makes sense, Idle Switch

JollyGreenMonster.co.uk

 

that the throttle postion switch

 

No, that would be code 31, code 42 is idle switch

 

what is the idle switch is it the box on the top of the iacv or is it somewhere else

 

car is still hunting its not maf as it cuts out when i unplug it it only does it when its warm mainly when you give ti some i did a test drove it under 4k so turbo was not at full pressure did not hunt at all