Hard to Start

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

PRELIMINARY CHECKS
Perform the careful visual/physical check as described in Preliminary Checks.
Make sure the driver is using the correct starting procedure.

SENSORS
Check:
Engine Coolant Temperature (ECT) sensor using a Tech 1, compare engine coolant temperature with Intake Air Temperature (IAT) on a cold engine.
- If coolant temperature reading is 5 degrees greater than or less than intake air temperature on a cold engine, check resistance in coolant sensor circuit or sensor itself. Compare ECT resistance value to the "Diagnostic Aids" chart on DTC 15 chart. Testing and Inspection
Manifold Absolute Pressure (MAP) sensor.
Throttle Position (TP) sensor for binding or a high TP sensor voltage with the throttle closed.

FUEL SYSTEM
Check:
Fuel pump relay operation - pump should turn "ON" for 2 seconds when ignition is turned "ON." Use Chart A-5. Testing and Inspection
Fuel pressure, use Chart A-7. Testing and Inspection
Contaminated fuel. Verified proper fuel usage with manufacturer recommended minimum rating of 91 octane.
Sufficient fuel quantity.
Both injector fuses (visual inspect).

NOTE: A faulty in-tank fuel pump check valve will allow the fuel in the lines to drain back to the tank after engine is stopped. To check for this condition, perform fuel system diagnosis, Chart A-7.

IGNITION SYSTEM
Check:
For proper ignition voltage output with spark tester J 26792 (ST 125) or equivalent.
Spark plugs. Remove spark plugs, check for wet plugs, cracks, wear, improper gap, burned electrodes, or heavy deposits. Repair or replace as necessary.
Bare or shorted ignition wires.
Loose Ignition Control (IC) module ground or PCM ground.

ADDITIONAL CHECKS
Check:
ISC operation - use Chart C-2B. Testing and Inspection
Basic engine problem.
For correct PROM. (Refer to Service Bulletins.)
EGR operation, use Chart C-7. Testing and Inspection