ERST MFI suddenly no boost pressure
Car was running a dream and boost was down quite low at 6psi. Had it in garage for MOT, it got some welding and now theyve dropped it off the car runs fine but no boost pressure.
when the engines started the vacuum gauge goes down to -20psi and under load the needle returns to 0
the dump valve moves in and out when revving the car stationary
checked the shaft and that spins freely
checked the pipes to and from the AMAL valve
checked the actuator arm for damage
Just looking for advice on where and what to look at as the cowboys at the garage stung me for £450 to weld my car and now theyve f*cked it they dont want any involvement! So now im skint and without my car.
Cheers for any help guys!