900 L4-1985cc 2.0L (1982)
Vacuum Spark Delay Valve: Description and Operation
Fig. 64 Vacuum Delay Valve
For some applications a vacuum delay valve, Fig. 64, is used in the vacuum line between the vacuum source and the distributor. The valve delays the
operation of the vacuum advance for a specified period of time, depending on the color of the valve (Brown 1-3 seconds; White 4-8 seconds; Green
16-24 seconds). This results in a reduction of the emission of NOx.