1977-79 Models
Run engine at idle speed. Disconnect Brown vacuum line at EGR valve. Connect a vacuum gauge to vacuum line or close line with finger. Vacuum must be present at idle speed. If no vacuum is present, replace exhaust pressure transducer.
Run engine at idle speed. Disconnect Brown vacuum line at EGR valve. Connect a vacuum gauge to vacuum line or close line with finger. Vacuum must be present at idle speed. If no vacuum is present, replace exhaust pressure transducer.