firemn131

Good Morning,
I have read through everything I a can find related to whistles..
But this is more specific.

Idle is perfect and steady.
Definitive vacuum whistle is heard after shut down and on top side of Motor.
I only hear the idle on shut down, and it gradually bleeds away.

All is running fine, and am back on the road as Daily Driver now after 3 years so I hesitate to tear into the intake just yet. I will live with it for a while longer but wondering if anyone has experienced the same.


Thanks

John

Mrmerlin

could it be one of the check valves at the brake booster?

firemn131

I will add that to the list.
It sounds like a good suspect. All the check valves are new.
I plan on trying to see why I have no heat this weekend, and will hunt further for the whistle.
thnx

Randy V

I had the same issue - it was the flappy valve bearing on the top of the intake.

firemn131

Well, if it is the Flappy, ( that should be easy to identify) did you notice any detriment other than it sounding like the tea was ready?

Randy V

Not really, but it may be an indication that the flappy is not operating correctly.

There are procedures in the archive that describe an easy way to test it.