Hard to Start

HARD START

Definition: Engine cranks OK, but does not start immediately. Eventually starts but will not remain running.

PRELIMINARY CHECKS

^ Perform visual/physical checks.

FUEL SYSTEM

^ CHECK: Fuel Pump (Circuit opening) relay operation - fuel pump should operate when engine is cranking.

^ CHECK: Contaminated fuel.

^ NOTICE: A faulty in-tank fuel pump check valve will allow the fuel in the pipes/hoses to drain back to the tank after engine is stopped.

IGNITION SYSTEM

^ CHECK: For proper ignition voltage output with J26792 or equivalent.

^ CHECK: Spark plugs. Remove spark plugs, check for wet plugs,cracks, wear, improper gap, burned electrodes, or heavy deposits. Repair or replace as necessary.

^ CHECK: Moisture in distributor cap.

^ CHECK: Bare or shorted wires.

^ CHECK: Worn distributor shaft.

^ CHECK: For good wiring connections from ECM/PCM to distributor.

^ CHECK: Signal rotor air gap.

ADDITIONAL CHECKS

^ CHECK: Idle Air Control (IAC) valve operation.

^ CHECK: Basic engine problem.

^ CHECK: Service Bulletins for calibration updates.