Cm2350 high commanded vgt

[Rawze]

(11-12-2020 )Carhauler Wrote:  Well I’ve exhausted searching the forum and google for a week now on this issue.
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CAC was replaced recently with a durashitter(not my choice)
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This could also be a heavy contributor of what is wrong. those durasuck coolers are very restrictive and cost not only fuel mileage but over-works the turbo to overcome their terrible flow issues. They have quite a number of fewer passageways and do not cool the air nearly as well compared to the OEM CAC coolers to accommodate their bulls$it gasket system inside the CAC to prevent leaks and this is a problem for many trucks and that brand of garbage. Here is some older posts on this...

http://rawze.com/forums/showthread.php?t...41#pid3441

durasuck causing someone performance issues: http://rawze.com/forums/showthread.php?t...42#pid3442

and: http://rawze.com/forums/showthread.php?t...74#pid8274

same thing with those garbage aftermarket egr coolers ... they will actually kill an engine. ref: http://rawze.com/forums/showthread.php?t...33#pid2233


as far as your original problems, the egr cooler is the most likely culprit of all the egr sensors and piping have been changed out. That turbo chuffing is going to kill that turbo. Every time it does this, the turbine blades are vioilently reversing due to over-pressure built up in the CAC and it relieving it backwards thru the turbo. This also causes the engine to fight itself all the time against this extra uneeded pressure and drops fuel mileage like a rock.

You did not mention that you replaced the exhaust gas pressure sensor (the one on the thermostat housing).. that one can cause issues like this too.. and the passageways/circuit for it likes to clog up too. When the sensor is out, spray some brake cleaner into the hole and crank the truck to see if it comes blasting back up out of the hole while the sensor is off it to ensure the circuit is clear. This is a common issue.