Read an article about replacing the check valve at our firewall with a larger one from the dealer as the larger one would hold more vacuum.

the dealer didn't have it in stock and said the little vac check valve would hold the same ammount of vacuum.

 

whne my wacky vents start up, i just spray a good amount of WD-40 into the vacuum line with the truck running. i break it loose right there at that check valve. i end up doing it about 3 times a year!

 

in to the vacuum line at what point?

 

i separate it at the check valve and spray it into the lines. with ever end sucks into the check valve.

 

sounds like a plan