Vanagon 2WD 21L (1986) Exhaust System: Catalytic Converter Testing
Catalytic Converter: Testing and Inspection
Physical Inspection
Catalytic converter, checking
Converter replacement can become necessary it the ceramic insert loosens
If exhaust "rattles"
- check that exhaust flanges are tight
If "rattle" was not due to loose exhaust flanges, converter may have failed
If exhaust system is tight
- remove catalytic converter
- look through both flange openings against light
If ceramic insert appears broken or melted as shown, converter has failed
If ceramic insert appears OK, check if ceramic insert is firmly seated in converter housing
Check as follows:
- while holding converter vertically, firmly tap flange onto solid wood from a distance of 20 cm (8 in)
- turn converter over and firmly tap other flange as before
If no knocking sound converter is OK
If no movement of the ceramic insert, converter is OK
If light knocking sound is heard inside converter, ceramic insert is loose and converter has failed
CAUTION: Avoid the following conditions on vehicles equipped with catalytic converters
usage of leaded gasoline
turning off the engine with the vehicle in motion
excessive prolonged cranking with an intermittent firing of a flooded engine
prolonged operation under load with a misfiring engine