Join Date: May 2009
Location: (518) on the boarder of MA+CT
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Turbo may need to be cleaned, have ran into that surging issue before being the unison ring siezed to the CHRA and the impellar housing was warped when i replaced the CHRA and when i put the impellar housing on wouldnt go over the impellar blades. Make sure the unison ring isnt cracked. Pull the vgt solenoid out and see if the tip that pushes the eccentric inside the chra has a ridge worn into it or binds up when you push it in. May just need a new vgt solenoid as well.
Check the EBP sensor and tube for being carboned up. Get some BG intake throttle body cleaner spray it down the tube use a pipe cleaner and get as much out of the tube and use about 5-10 psi regulated air to blow the sensor after spraying some intake cleaner in that.