My turbo climbs up to about 17 psi and then back down to 13 then back up to 17 back and forth very fast. the whole car bucks and everything. it is almost like the turbo is revving itself out like RPM's would on a car back and forth. does anyone know what the problem is? i have no manual boost controller or anything. other then the mods listed below the car is completely stock.
my mods are:
Cat back exhaust.
Air filter and intercooler piping.

 

Check for any boost leaks.

 

its weird. it just started doing this the other day. i thought it was spark plugs, changed them and it still does it. someone else on another forum told me it could be my ecu not adapting to the cold weather??

 

maybe its the boost solenoid?

 

wait did you flash or upgrade your ecu when you did those mods! could be a problem

 

no i never flashed it. but i had the car running perfect with those mods for about 3 months. this just started hapening outa no where the other day. someone said it could be because it got cold outside??

 

Its not because its cold outside. I'd check ALL your piping clamps. I would suspect its one of them. If not, it could be the wastegate actuator, mine went bad and I couldn't boost right. It would run as high as 16-17lbs and then tapper real bad to like 12lbs. I didn't have any other issues though, it drove fine.

 

yeah its drives perfect. just when i hit full boost

 

how many miles were u at when your wastegate actuator went bad? i have about 40k on mine