MBE 4000 DDEC VI Troubleshooting – Section 11.9 Faulty Fuel Injection

Section 11.9
Faulty Fuel Injection

To determine if a faulty fuel injection is causing excessive white smoke, perform the following:‪

1. Check for faulty fuel injection; perform “Flow Test at Fuel Injector”. Refer to "3.5 Test #3 Flow Test — At Fuel Filter" .
2. Repair or replace the faulty fuel injection; refer to MBE 4000 Service Manual (6SE420), Chapter 2, Fuel System — Fuel Injector”.
3. Verify fuel injection repair or replacement; refer to "11.9.1 Test the Engine with Repaired Fuel Injection" .

Section 11.9.1
Test the Engine with Repaired Fuel Injection

To determine if a faulty fuel injector is causing excessive white smoke, perform the following:‪

PERSONAL INJURY ‪
To avoid injury before starting and running the engine, ensure the vehicle is parked on a level surface, parking brake is set, and the wheels are blocked.‪

1. Start and run the engine.
2. Run the engine at idle with a no-load condition for approximately five minutes, allowing the engine coolant to reach normal operating range, approximately 88-96°C (190-205°F).
3. Visually inspect exhaust for excessive white smoke.
   1. If the engine exhaust emission appears normal, no further troubleshooting is required. Shut down the engine.
   2. If the engine exhaust emission is excessively white, shut down the engine. Check for improper valve clearance or damaged camshaft lobes and rollers; refer to "11.10 Improper Valve Clearance, Worn or Damaged Camshaft Lobes and Rollers" .