View Full Version : vacuum leak help

09-20-2010, 07:47 PM
quick question i performed a boost leak test and found vacuum leaking from the cam chain tensioner, does the seal prevent vacuum from escaping also?. i am not leaking heavy oil. it seems to be leaking very small amount of oil

09-21-2010, 10:24 AM
When you do a boost leak check, you have to block off the pancake valve so it doesn't build pressure in the head. If you domt do that, you'll get tons of white smoke when you start the car.

09-21-2010, 10:47 AM
oh excatly what happen. so i need to remove the pankcake valve plus block both ports ? thanks for the info!

09-21-2010, 11:01 AM
Just curious, can not blocking off the pancake valve while doing a boost leak test hurt the engine?