Engine Noise Diagnosis Chart
Even experienced car technicians find it hard to know whats wrong with an engine just by listening to it.
Engine noise diagnosis chart. Scan your codes and follow the chart to determine what the code means. Full list of OBD II Diagnostic Trouble Codes. To check your clearances you can insert a thickness gauge between the valve stem and the rocker arm or lifter.
Some Vehicle Specific Codes. Car engine noise can arise from many factors and well list some of the common causes for a specific sound. Incorrect fuel injector calibration fault.
Incorrectly fitted timing belt. Buzzing or Whining Noises Automatic Transmissions. Some parts stores will scan your codes for free.
Main rod or thrust. The cause is often excessive valve clearance or a defective hydraulic valve lifter. Rumbling or thumping sound deep in the engine when accelerating.
When it comes to isolating noise in the engine compartment good directional hearing is a great help. Excessive clearance between the piston skirt and the cylinder wall. If the noise goes away when the engine warms up nothing needs to be done.