wheddon09

hi! recently brought a 52 plate wrx lovely car i must say but has a bad flat spot or not running right...
if im just drving steady and build the speed up slowly its fine but if i just put my foot down while at low rpm the car dosnt respond for few seconds then bulids up speed really slowly untill about 4500rpm then takes off! any suggestions? thanks

ShaunFlucker

Turbo lag?

wheddon09

seems to be more than a turbo lag.. also had a service 4 months ago anything else i can check?

also at what rpm shuld the turbo kick in? cheers

ShaunFlucker

If its a td04, I would imagine roughly 3000 - 3500 rpm.

Cleaning your MAF sensor might help.

ShaunFlucker

If its a td04, I would imagine roughly 3000 - 3500 rpm.

Cleaning your MAF sensor might help.

wheddon09

Will clean that tomorrow see if that solves it, any thing else it is Likely to be? Cheers

propofol

Could try replacing fuel filter if hasn't been done recently. Coils/HT leads not 100% and causing a miss when under load. Turbo boost controller a problem. Knock sensor retarding spark. Faulty O2. Vacuum leak. Restricted exhaust from gummed up cat. Timing off. Sorry for the long list but just trying to think of all the things that could cause poor performance! I've probably missed some things out too!

Turner Tronics

Just don't s*** yourself thinking its the worst thing possible look into the little things first mine does the same as yours sometimes there isn't a Subaru out there that runs 100% all the time.

wheddon09

Hi that's for the help will try all I can tomorrow my sel before taking it to a garage! Had one coil and spark plug out plug looks nearly new coil has some small amount of green on the end! Plus it does it worse when cold warmer it gets less it struggles. Thanks for all the help guys

wheddon09

Cleaned the MAF today and checked all coils and plugs they look all fine! Has improved a little bit but not great amount! How can I check the turbo boost controller? And can't seem to find the knock sensor? Cheers

propofol

To check the boost you will need to tee a boost gauge into one of your vacuum lines. you may also be able to check it by using a bluetooth obd connector with an app like torque for your phone or tablet. this will also potentially tell you if the ignition is being retarded. i don't have any experience with it as my car is pre-obd. the knock sensor on my car is on top of the block towards the rear. under the throttle body opening and in front of and to the right of starter motor. given your symptoms i would check she's not overboosting in the first instance.

wheddon09

Hi I've ordered a obd connector just waiting for that to come! Trying to keep the cost down and do all the cheaper things 1st thanks

wheddon09

Had the computer put on her and its saying misfire in 1,2,3? But not 4? Any recommendations? Cheers