Black_Outlaw
Member
Learned forum members.
I am, under acceleration, often seeing NEGATIVE boost. It will quite literally go from 18psi to -0.86. At this point i can lift slightly and gain POSITIVE boost, or I can keep going (and feeling the loss of power) and then it will power up again.
Things to rule out:
Replaced EVERY SINGLE VACUUM LINE - and cable tied them on
Replaced Boost Control Solenoid
Cleaned inter-cooler and MAP sensor
Re-clamped ALL boost lines to ensure no leak
Cleaned intake
Liqui Moly the crap out of every system.
Lubricated the Actuator Arm on the turbo.
I can confirm actuator is "bobbing" at idle.
So - thoughts or "possibilities". My guess is the VNT system - but it makes no sense it going from Boost to Vacuum and back..
I am, under acceleration, often seeing NEGATIVE boost. It will quite literally go from 18psi to -0.86. At this point i can lift slightly and gain POSITIVE boost, or I can keep going (and feeling the loss of power) and then it will power up again.
Things to rule out:
Replaced EVERY SINGLE VACUUM LINE - and cable tied them on
Replaced Boost Control Solenoid
Cleaned inter-cooler and MAP sensor
Re-clamped ALL boost lines to ensure no leak
Cleaned intake
Liqui Moly the crap out of every system.
Lubricated the Actuator Arm on the turbo.
I can confirm actuator is "bobbing" at idle.
So - thoughts or "possibilities". My guess is the VNT system - but it makes no sense it going from Boost to Vacuum and back..