939010615 - 1080A20 EXHAUST FUMES - CHECK WITH OPACIMETER
- Start the car and let it warm up until the radiator cooling fan has come on twice.Leave as little time as possible before starting the test once the engine is warm and avoid leaving the engine to idle for long periods. |
Check that the probe diameter is at least 0.22 times the diameter of the exhaust pipe. |
Ensure that the exhaust gas intake fittings do not allow leaks. |
Check that the probe intake pipe from the tailpipe to the fume meter is on an ascending gradient without any sharply angled joints. |
Ensure the counterpressure at the probe is as specified and does not exceed 7.5 bars during the test. |
The readings may be considered stable when they are within a band that is 0.25 m-1 wide for four consecutive readings and not in decreasing order. |