1978 Rabbit & Scirocco
WARNING: This page does not describe the selected car, but rather 125 other vehicles, including the 2010 Volkswagen Routan, 2009 Volkswagen Routan, 2002 Volkswagen Cabrio, 2001 Volkswagen Cabrio, and 2000 Volkswagen EuroVan. However, it is still accessible from the selected car via links, so may be relevant.
- Start and warm engine to normal operating temperature. Disconnect vacuum hose to EGR valve and temporarily connect vacuum hose from power brake booster to EGR valve. Engine should run rough or stall. If engine does not respond as indicated, check for plugged EGR passage or faulty EGR valve.
- Connect vacuum gauge to temperature valve, in place of vacuum hose that goes to EGR valve. With engine at normal operating temperature, there should be 2-4 in Hg. If vacuum reading is not as specified, replace temperature valve.