Surges at Steady Speed

Definition: Engine power variation under steady throttle or cruise. Feels like the car speeds up and slows down with no change in accelerator pedal.

POSSIBLE CAUSE ACTION

Insufficient fuel supply Check fuel supply.


Faulty fuel pressure regulator Check fuel pressure.


Contaminated fuel Check for water or excessive alcohol in fuel.

Drain fuel tank and add clean fuel. Refer MAINTENANCE PROCEDURES/FUEL TANK DRAINING.


Dirty fuel filter Replace fuel filter.


Lean operating condition Check computer controls.


Vacuum leak Inspect vacuum hoses for proper routing and damaged lines.

Check intake manifold, throttle body base and gasket.