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 in "Testing
flange gasket leaking, Procedures" in Emissions
excessive backpressure,
loose valve



Spark timing Check Spark Controls in
"Computerized Engine Controls"


PTC heater malfunction Check PTC heater system
in "Testing Procedures" in Emissions


Faulty canister purge Check Evaporative system in
liquid fuel in carbon canister "Testing Procedures" in Emissions



Ignition timing Check Ignition Timing in "Adjustment
Procedures" in Emissions



Restricted exhaust system Check Catalytic Converter system in
"Testing Procedure" in Emissions



Poor or contaminated fuel Recommend higher grade fuel