mbright81

Hello people

Ive had a pre turbo exhaust leak for some time and finally got the funds to have it fixed. I've had new headers, manifold, up pipe and all gaskets replaced. spool up seems much better, getting on to boost between 3500-4000 revs which i believe to be about right on a 1997 wrx import with ihi vf22 turbo. correct me if I'm wrong.

If I'm going steady in 3rd 4th and put my foot down boost starts to build but then seems to stall a little and engine revs continue and then turbo catches up then drops off again and so on. Is this over boost???

Looking through these forums it seems I could do with bypassing the boost solenoid to eliminate if its the waste gate thats at fault which would then prove its the boost solenoid.

Am I thinking along the right lines or have I got it wrong??

Many Thanks

Mark

rb5 stu

No, overboost would be boosting higher than it should. That soulnds like maybe a boost solenoid.

mbright81

is the best way to check to bypass, turbo straight to waste gate?

can the solenoid be cleaned? it can be heard working when i connect the green plugs together under the dash

rb5 stu

Yeah with the green plugs connected and you hear it clicking take the pipes off it and spray it with a bit of carb cleaner or even brake cleaner. Let it dry and connect the pipes again.

mbright81

Ive got some brake cleaner Ill try that in the morning.

thanks for your advice

IveGotTheBug

Did cleaning the bcs cure your problem?

mbright81

Hi

Yeah I cleaned the bcs it seems a little better and I'm reaching more pressure than the wastegate would top out at if it was uncontrolled.
I'm thinking about a leaky dump valve now
Any ideas?

IveGotTheBug

Actuator arm sticking,bcs,coil or leads on way out,id try giving the pipe work to and from solenoid a good clean to then reset ecu

mbright81

Ok thanks

I've changed all the vacuum hoses recently trying to find a boost leak. That all ended up with new manifold and up pipe. Coil pack and leads is somethin I haven't checked yet. Is there a way of testing them at all or is it best to just replace them

IveGotTheBug

Not sure how or if you can check coil pack and leads,could also be fuel related