Ford — EGR System Gas Flow Test
Testing & diagnosis · EGR valve
From a Ford service manual — check it applies to your exact model before use.
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Procedure
- Make the test with the engine idling and hot.
- Remove the vacuum line from the valve diaphragm and plug the line to prevent a vacuum leak.
- Attach a hand vacuum pump to the valve diaphragm.
- Apply 15 inches of vacuum to the valve, a little at a time.
- If gas flow is okay, the engine will begin to idle roughly or may stall.
- If idle does not change, there is a restricted passage in the valve or spacer; remove the valve for inspection.
- If the valve diaphragm fails to hold vacuum, install a new EGR valve.
Tools required
- Hand vacuum pump Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Apply 15 inches of vacuum
Source: Ford service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.