Can bad EGR cause trnsmission problems?
I have the MH listed in my signature i.e. Chevy 454 P series with I believe the 4L80E transmission. Recently experienced problem with not shifting into overdrive and intermittent Check Engine light. ...
Forum Discussion
I'm not sure with the OBD1 computer but it may be possible that the computer sees not vacuum from the map sensor and won't allow it to shift into overdrive. Anyway I would try to fix the EGR first .
