S10/T10 Blazer 2WD L4-121 2.0L VIN Y 2-bbl (1983)
3.
Blow-by at maximum capacity of regulator valve.
4.
Plugs from kit or engine vacuum lines are not properly sealed.
5.
Tester knob improperly set.
Yellow & Red
1.
Regulator valve or system partially or fully plugged.
2.
More engine blow-by than regulator valve can handle.
3.
Vent hose plugged or collapsed.
Red
1.
Regulator valve or system fully plugged or stuck.
2.
Vent hose plugged or collapsed.
3.
Extreme blow-by.