Surge, Hesitation, Stall on Acceleration

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
flange gasket leaking,
excessive backpressure,
loose valve



Spark timing Check spark controls (EST, ESC)



Air management valves Check air injection system



EFE malfunction Check Early Fuel Evaporation system




Hot air tube not connected Check inlet air temperature system (TAC)
to air cleaner, vacuum motor
inoperative, air damper
door binding or not opening



Faulty canister purge Check evaporative system
liquid fuel in carbon canister



Ignition timing Check ignition timing



Restricted exhaust system Check catalytic converter system



Poor or contaminated fuel Recommend higher grade fuel