Ford — EGR Diaphragm Leak Test
Testing & diagnosis · EGR valve
From a Ford service manual — check it applies to your exact model before use.
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Procedure
- Attach a hand vacuum pump to the vacuum nipple of the EGR valve.
- Apply eight inches of vacuum and trap (hold) it.
- The diaphragm must hold 7-8 inches of vacuum for at least 30 seconds.
- If it holds vacuum, the diaphragm is okay; proceed to the Source Vacuum test.
- If the diaphragm will not hold vacuum, replace the 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 8 inches of vacuum
- Hold 7-8 inches for at least 30 seconds
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.