legacy900 Posted March 29, 2013 Share Posted March 29, 2013 hi all help!!! iam new to this i have just got a 1998 twin turbo gtb manual i got it with the knock sensor gone witch i have changed reset the ecu but when driving and coming on to second turbo the boost drops/retards has anyone had this or know of it thanks legacy900 Link to comment Share on other sites More sharing options...
monkeyposeur Posted March 30, 2013 Share Posted March 30, 2013 Check for boost leaks, vacuum leaks. So did it have the boost problem only after you installed the knock sensor? If so take it back off and see what happens, lol. Link to comment Share on other sites More sharing options...
legacy900 Posted March 30, 2013 Author Share Posted March 30, 2013 not taking it of it was a bugger to do lol as far as i no it was thinking it might be the boost pressure valve Link to comment Share on other sites More sharing options...
spooln30 Posted April 5, 2013 Share Posted April 5, 2013 Could be the wastegate for the second turbo or the vacuum solenoid for the second turbos wastegate. I've had this problem on my twin turbo 2jz Toyota engine before I went with a single turbo. Link to comment Share on other sites More sharing options...
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