LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> GMC >> 1983 >> Magnavan 6.2 J, 475/M40 >> Repair and Diagnosis >> Engine Performance >> System >> Pulse Air Injection System >> Trouble Shooting >> Surge Or Poor Performance
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Surge Or Poor Performance

May be caused by failure of 1 or more check valves. Exhaust gas will enter carburetor through air cleaner and cause poor driveability.