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
Until I got smart in the early 70's I owned an automatic transmission shop (15 months). Modulators can fail in several ways. To ignore testing of the vacuum modulator would be a breach in diagnosis. Ownership taught me a lesson about employee unreliability - I quickly moved on to electrical and rebuilding. Diagnostics itself is an art form. But it is a discipline. Ignore the discipline and fail. Troubleshooting is unforgiving.
