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Mp8 will not boost
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Question
Mack317
Have 2013 mp8 chu613.420k miles.been to 7 different shops with 6 different answers.feels like it’s slow on acceleration.pulls hills okay.but my main problem is when you come off full boost at 25-30 psi and drop to 16-20 psi it will not go back on boost. I have to let off pedal for a second and then it will go to full boost.has code for boost pressure. I replaced sensor.also has code for egr differential pressure.shop said it read .31. No smoke.sometimes starts in 1 second sometimes takes 5 seconds.when running empty with steady pedal it will boost 5 seconds then off 5 seconds like a switch is making it surge. Seam to me like electric issue because it’s steady.
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