18. Glow Plug Mist Test - No Start

18. GLOW PLUG MIST TEST - NO START

Purpose:

WARNING: Contact with exposed fuel injector wiring, if energized, may result in electric shock. Use care when working on or around energized fuel injector wiring. Fuel injector wiring supplies high voltage to operate the fuel injectors. Failure to follow this instruction may result in serious personal injury.

The purpose of this test is to find a fuel injector with a leaking nozzle for a no start condition.

For a hard start condition, continue to the Power Balance Test to continue diagnosis.

Glow Plug Mist Test - No Start:

Recommended Procedure:

NOTE: This test is intended to diagnose a leaking fuel injector tip for vehicles with a no start condition only. If the engine runs, do not carry out this test, a fuel injector may be misdiagnosed as the leak may be to small to be visually detected. Excessive engine oil in a cylinder can mislead to multiple fuel injectors being suspected for leaks.

- Disconnect the 15-pin inline connector on the left hand valve cover harness.
- Disconnect the 15-pin inline connector on the right hand valve cover harness.
- Remove all glow plugs.
- Crank the engine 15 seconds 2 times to clear the cylinders.
- Crank the engine 15 seconds while checking for a mist from the glow plug holes.

If a mist is visible from one glow plug hole, install a new fuel injector at the cylinder in question and repeat the test to verify the repair. Verify the engine oil level and quality after the repair, change the engine oil and check the charge air cooler (CAC) for contamination. Refer to the Fuel Delivery and Air Induction, Charge Air Cooler Repairs, for the correct cleaning procedures.

If a mist is visible from all glow plug holes or one bank of glow plug holes then carry out the Inverse Fuel Injector Leak Test to continue diagnosis. 23. Inverse Fuel Injector Leak Test

If no mist is visible from any glow plug holes, carry out the Fuel Injector Return Port Leak Test - No Start to continue diagnosis. 19. Fuel Injector Return Port Leak Test - No Start

Possible Causes:
- Fuel injectors

Tools Required:
None