Hesitation or Stalls on Acceleration

Definition
Momentary lack of response as the accelerator is pushed down. Can occur at any vehicle speed. Usually most severe when accelerating from a stop. May cause the vehicle to stall if severe enough.

POSSIBLE CAUSE ACTION

Poor or contaminated fuel Check Excessive alcohol content.
Replace Drain fuel tank and add clean fuel
NOTE Recommend higher grade fuel



Fuel Metering Check Air/fuel ratio (O2 Sensor Voltage)
Perform Oxygen Sensor Test in DIAGNOSIS, TESTING AND
INSPECTION PROCEDURES in
COMPUTERS AND CONTROL SYSTEMS.

Check Fuel pressure.
Perform Injector service (cleaning)



Faulty Throttle Position Sensor(TPS) Check TPS for binding or sticking
Voltage rate should move evenly and steadily
as throttle is moved toward Wide Open Throttle (WOT)



Faulty EVAP emission control Check Canister purge system




Inoperative fuel injector(s) Check Injector(s).
Perform: - Injector driver circuit test.
- Injector balance test.