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How to Measure the Crankcase Negative Pressure in Volkswagen Audi?

1 Answers

LaMargaret

07/29/25 2:42pm

After cutting off a single cylinder, the drop in Px should be as large as possible, which is an indicator to judge the performance of ignition, fuel injection, and sealing in each cylinder. Quickly open and close the throttle. If the needle swings between 6.7-84.6 kPa, it indicates that Px responds well to throttle opening changes, representing good sealing performance. Connect the vacuum gauge to the oil dipstick hole. If a positive pressure is measured in the crankcase, it indicates poor sealing or a blocked PVC ventilation system. Start the engine, remove the filter and spark plug, insert the pressure gauge into the spark plug hole, and stop when the pointer maintains the maximum reading. Record the cylinder pressure gauge reading.

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