Noise, Vibration And Harshness
NOTE:
As the checks suggested here are open to interpretation, they should be used as a guide only. Descriptions of noises, etc, are in general terms, so depend on a degree of experience on the part of the technician.
| SYMPTOM |
POSSIBLE CAUSES |
ACTION |
| Rattle/ticking from top of engine |
- Valve gear noise
- Camshaft bearing noise
- Camshaft chain noise
- Tensioner noise
- High pressure fuel pump noise
|
- Perform an engine oil pressure test. Check the operation of the hydraulic tappets and the condition of the camshaft. Check the camshaft bearings, chains and tensioners. Check the high pressure fuel pump. Rectify as necessary
|
| Rattling noise from the engine compartment with Malfunction Indicator Lamp (MIL) illuminated and P052A-00, P0011-71, and/or P000A-00 DTC
s set in the Powertrain Control Module (PCM) |
- Variable Camshaft Timing (VCT) actuator unit internal failure
|
|
| Squeaking, creaking or squealing from front of engine |
- Accessory drive belt
- Accessory drive belt tensioner
- Accessory drive belt driven components
|
- Refer to the appropriate service information and check the accessory drive belt. Rectify as necessary
|
| Whine, slap or growl from front of engine |
- Accessory drive belt
- Accessory drive belt tensioner
- Accessory drive belt driven components
|
- Refer to the appropriate service information and check the accessory drive belt. Rectify as necessary
|
| Knock from lower half of engine (often worse with a cold engine) |
- Piston slap
- Gudgeon pin noise
- Connecting rod bearing noise
|
- Perform an engine oil pressure test. Check pistons, cylinder bores, piston pins and connecting rod bearings for excessive wear. Rectify as necessary
|
| Knock or rumble from lower half of engine (often worse on overrun) |
|
- Perform an engine oil pressure test. Check connecting rod bearing for excessive wear. Rectify as necessary
|
| Misfire or rough running |
- Engine management system
- Fuel charging and controls
- Valves burnt or sticking
- Valve guides worn
- Cylinder bores/piston rings worn
- Piston rings broken
|
- Refer to the appropriate service information and check the engine management system, fuel charging and controls. Perform an engine oil pressure test. Check for excessive wear in engine components. Rectify as necessary
|