feimax

Hey guys im facing a very weird problem my tuner and i cant seems to figure out wats the problem... When im on boost around 5-6k rpm the car will suddenly jerk quite violently feels like fuel cut. I've changed the fuel pump, checked the vacuum hoses and anything tat lose in the engine bay but cant seems to find the problem. My tuner has also tried tuning doesnt work.

feimax

Im also wondering isit possible that the problem is with the twin wastegate, becos it seems like when the waste gate wants to open the kicks in

bcrance13

iTrader: (3)

I had the same problem a few months ago. Car was trying to run 40 pounds of boost on stock turbo and was hitting boost cut. Bad boost controller. Try analyzing your boost pressure.

feimax

Hmmm but ive tried to bypass the controller and direct it to the wastegate same thing...

binky

iTrader: (11)

Definitely sounds like boost cut.

-Bink

Don Q

iTrader: (3)

Happened the same to me! The problem was a bad cam sensor. Check if you can borrow one from another car and try again.

http://www.youtube.com/watch?v=Nn5Cr6tSv0I

Here is a video I took with my cell phone. In the video you can't appreciate it quite well, it FELT a lot worse than what the video shows.

dy4anEvo

check what your plugs look like/gapped at?

DSM1320Josh

Boost cut in factory ecu. Had the same prob a couple weeks ago and had it flashed out.

prockish_03evo

iTrader: (7)

I would say boost cut and/or spark plugs need replaced and gapped

wtftuck

i had a similar issue and a reflash fixed it :/

EvilEVO800hp

iTrader: (2)

+1

grey~ghost

not trying to take over the thread but im having similar issues.

RSGuy

iTrader: (12)

fuel/boost cut. turn down your boost. any real tuner should be able to raise that boost threshold.