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Originally Posted by osudoc11
Thanks for the tips. Any idea why all of this would occur after catless header and loading the tune? I just seems to be a weird coincidence.
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The tune likely asks the ecu to move the cams in a more aggressive (ie rate of change) manner than the stock tune, and may ask for more overall magnitude of movement.
This may have uncovered a latent defect in the cam actuator system .
I have heard of this on at least one other car, ie car was fine, guy loads tune (used on many other cars without problem), then gets cam DTC codes, goes back to stock tune, no DTC codes.
you probably need to log a car with no defect and compare the logs.