Chart C-4C Distributor Vent System Check

Chart C-4C:

Distributor Vent System:

CHART TEST DESCRIPTION
Numbers below refer to circled numbers on the diagnostic chart.

1. Check for a blocked or restricted vacuum source.

2. Check for blocked, restricted or collapsed hoses. Check the connections at the distributor cap for blockage. Check for a faulty check valve or check valve/filter.

3. Check for damaged or leaking hoses or connections. Check the seal between the distributor cap and the distributor. Also check the distributor cap for cracks or other damage.

DIAGNOSTIC AIDS
If the check valve/filter or the check valve is installed backwards the system will not function. Verify flow direction is toward the manifold using a hand held vacuum pump at the check valve and the check valve/filter's ports. Vacuum should hold in one direction and not the other. If vacuum holds or doesn't hold in both directions for either component, that component is faulty.