A Mercedes-Benz car's automatic transmission has an unusually fuel failure, every month will add a lot of automatic transmission oil.
     After inspection, automatic transmission before and after the oil seal are no signs of oil, oil plate is also well sealed. Common parts of the oil spill are normal. And then carefully checked and found the left side of the box vacuum control shift delay valve vacuum input tube with automatic transmission oil. At this time it suddenly realized that the original automatic transmission oil were all sucked into the engine burned out, no wonder the exhaust pipe impurity smoke blue smoke.
     Remove the vacuum control shift delay valve inspection, to determine the valve body is due to internal seal failure. With the thumb to squeeze the body within the lead role of the plunger, you can see the "pump oil" phenomenon, that is, automatic transmission oil from the valve body of the vacuum input, then replace the vacuum control shift delay valve, automatic transmission Exceptional fuel consumption troubleshooting.