Stalls at Idle, Deceleration

Engine stalls at stops and on deceleration.

POSSIBLE CAUSE ACTION


EGR valve always open,
or gasket leaking See Exhaust Gas Recirculation


Ignition timing incorrect Check ignition timing.
See Adjustments


Restricted exhaust system See Catalytic Converter


Base idle speed too low Check idle speed.
See Adjustments


Idle speed control valve defective See Computers and Control Systems



Unmeasured air (vacuum leaks) Inspect air flow meter,
vacuum hoses, intake air ducts
and manifold.
See Fuel Delivery and Air Induction


Evaporative system malfunction or leak See Evaporative Emissions System


PCV system clogged, restricted or leaking See Positive Crankcase Ventilation