Check the EBPDES against EBP_G and while watching the VGTDC. If the VGT is at 85% and EBPDES is high, but EBP_G is low, the turbo vanes are stuck open. At idle, if EBPDES and EBP_G match, but VGT is over 75% (warm engine, EGRVP below 1 volt), check for exhaust... Login to read more.