Hard Start

DEFINITION:
Engine cranks OK, but does not start for a long time. Does eventually run, or may start but immediately dies.

CHECK:
- For water contaminated fuel.
- Fuel system pressure.
- TPS for sticking or binding should read less than 1.25 volts on a "Scan" tool.
- No crank signal.
- EGR operation.
- Fuel pump relay (pump should be "ON" for 2 seconds following ignition "ON", to pressurize fuel loop for starting.)
- For a faulty in-tank fuel pump check valve, which would allow the fuel in the lines to drain back to the tank after the engine is stopped. To check for this condition:
1. Ignition "OFF."
2. Disconnect fuel line at the filter.
3. Remove the tank filler cap.
4. Connect a radiator test pump to the line and apply 103 kPa (15 psi) pressure. If the pressure will hold for 60 seconds, the check valve is OK.
Check ignition system for:
- Proper sparking voltage and duration.
- Worn distributor shaft.
- Bare and shorted wires.
- Pickup coil resistance and connections.
- Loose ignition coil connections.
- Moisture in distributor cap.
- Spark plugs for wetting, cracks, wear, improper gap, burned electrodes, or heavy deposits. If engine starts but then, immediately stalls, open distributor bypass line. If engine then starts, and runs OK, replace distributor pickup coil. Check EST circuits for short to ground.