Vaccum leak?

[1967cutlass]

I can hear a distinct hissing coming from the intake manifold where it meets the block. When I spray parts cleaner there, and it doesn't really have to be in the same area, it like sucks in the mist or something and combusts and runs better. What would cause it to be sucking in air or whatever?

[sube]

I can hear a distinct hissing coming from the intake manifold where it meets the block. When I spray parts cleaner there, and it doesn't really have to be in the same area, it like sucks in the mist or something and combusts and runs better. What would cause it to be sucking in air or whatever?

Your intake manifold gasket is obviously fugged, or the manifold bolts are loose.

Pat.

[elscotto80]

Check the grommets where the injectors sit in the head, mine hissed and I had to replace all of them.

[1967cutlass]

Check the grommets where the injectors sit in the head, mine hissed and I had to replace all of them.


how did the car run? It's hard to tell if it's the gasket or the injector grommets.