Surge, Hesitation, Stall on Deceleration

Engine hesitates or stumbles on acceleration, sometimes stalling. This condition can occur at any speed, but primarily from a stop. Vehicle may also experience a surge or rise and fall of engine speed at cruise or steady throttle.

POSSIBLE CAUSE ACTION


EGR malfunction Check EGR system. Exhaust Gas Recirculation
flange gasket leaking,
excessive backpressure,
loose valve



Spark timing Check Spark Controls. Refer to COMPUTERS AND CONTROL SYSTEMS. Computers and Control Systems



Air management valves Check Air Injection system. Air Injection



Faulty canister purge Check Evaporative system. Evaporative Emissions System
Liquid fuel in carbon canister



Ignition timing Refer to COMPUTERS AND CONTROL SYSTEMS. Computers and Control Systems



Restricted exhaust system Check Catalytic Converter. Catalytic Converter



Poor or contaminated fuel Recommend higher grade fuel.