acuboy wrote:
Thanks for your reply. I have an EGR delete through the GDE tune. When the overboost problem first occurred the first thing I swapped out was the MAP. I've heard people mention shortening the range of the actuator arm to prevent overboost, but this seems like a bandaid and also seems like it would effect the performance. If there's too much play in the travel of the actuator arm can this cause overboost? Does that mechanism start to develop too much pay over time? I'm installing a boost gauge tomorrow, so I should have more info then. I believe you can see boost through the Torque Lite app, which I'm assuming would be the same info the brain is seeing. Anyway, all thoughts or input are appreciated. This has been a tricky troubleshoot for me.
thanksd
Please note: NO TUNE can completely guarantee that no leakby takes place in the EGR valve. Only by totally removing the entire system (Weeks Elbow Kit) or installing a blank-off plate in the exhaust feed line to the EGR valve can you totally eliminate any possibility of leakby.
I believe to much play in the linkage for the variable vanes would actually cause underboost, not overboost. Being you stated it only happens when doing a hard for fast acceleration leads me to believe either the turbo is actually producing too much boost, or the MAP sensor is defective and giving the ECM false information during full boost operation. I really believe the problem is the latter.
Good for you on installing a boost gauge, that will tell you a bunch. If you don't see actual boost greater than 24 psig peak during full boost acceleration, then the problem is not your turbo or linkage.
First thing I would do is install a new MAP sensor and see if it fixes your problem.
You can purchase online a GM MAP sensor PN GM 55206797 for ~$20 bucks.
*actually it is a BOSCH part, PN 0 281 002 845Many on LOST including myself are using this GM/Bosch sensor in place of the much higher priced OEM sensor.
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