Audi Workshop Service and Repair Manuals

Special tools, testers and auxiliary items required

• ◆ V.A.G 1390

Test requirements:

• ● No leaks in vacuum pipes and intake manifold connections
• ● Vacuum pipes not clogged or kinked.
• ● Engine oil temperature at least 50°C.

Test sequence

• ‒ Start engine and run at idling speed.
• ‒ Pull vacuum hose off mechanical EGR valve.

• ‒ → Connect hand vacuum pump V.A.G 1390 to valve.
• ‒ Operate pump.
• ‒ There should be a noticeable impairment of idling speed behaviour

If this is not the case:

• ‒ Cehck pipes and connections for clogging; if necessary, renew mechanical EGR valve.