Fitted my universal dump valve about an hour ago, took the car up and down the road with no problems at all, when coming back towards my house the car starts juddering and not boosting up properly and the spanner light comes on, next thing i know the engine is starting to cut out a little bit and the exhaust backfiring slightly.
I get it back home and take the dump valve off etc and the spanner light is still on and the same symptoms. I had a full turbo back exhaust system put on friday and im waiting for a exhaust clamp to come through the post for the precat as its blowing.
Could this be due to the exhaust not being set up properly?
Any help will be appreciated as im quite a novice when it comes to turbo cars