Quote:
Originally Posted by marcvtec
sounds like a boost leak to me.
I would replace the boost solenoids and check all the vacuum hoses, pressure test if you can.
Ecu is probably targeting boost and cannot achieve that and is closing throttle to save engine.
While your at it check the low and high pressure fuel pumps, and confirm flow.
My 2 cents.
|
Throttle closes when boost is over target (not under), which is what's happening here. Can't check low pressure because its a z4 (no sensor) and high pressure is fine. Although your idea to check boost solenoids is good.