Occasional extra whining from engine

[blinkwatt]

Originally Posted by CJ_Boxster

SO place a peice of tape over it and see if this changes anything for anyone. I did and the car runs better and is finally stopped whining.

How does the car run better?

If there was something meant to be put over it wouldn't Porsche have made some sort of plug for it?

[CJ_Boxster]

Well It is suppose to only open and vacum suck the gas vapors when a gas pump nozzle enters the filler neck, You should hear a click when that happens, When there is no gas pump in the filler neck, No vacum should come from this hole... Reason for the tape is, In my case, when the gas pump is reomved from the filler neck, there is still a vacum coming from this vent hole.

In fact when i have my buddy give the throttle a nudge up to 3000 rpms, i can hear whining or howling from this vent. So that is a vacum leak which jacks up the a/f ratio, which makes the car run worse. I can always peal the tape back when pumping gas and reseal it once im done cause thats essentially how it was designed to work.

So somewhere along the lifetime of the car, the vent tube stopped closing itself once i pulled gas pump out of the filler neck

Well, now you know. (insert gay rainbow star here)

[CJ_Boxster]

Originally Posted by boggtown

Well, now you know. (insert gay rainbow star here)

Then "Reading Rainbow" theme song starts and we all learn about volcano's.

[kabel]

Originally Posted by CJ_Boxster

give the throttle a nudge up to 3000 rpms, i can hear whining or howling from this vent. So that is a vacum leak which jacks up the a/f ratio,

I must be missing something...
I can believe that being a vent, or an inlet for a vacuum, but it seems odd a vacuum system for venting refueling fumes would somehow be tied into the vacuum created by the engine. I mean, you shut your engine off when refueling don't you (i.e. no vacuum when refueling)? I admit I know little about all the compnants that make up an engine, do our cars have an electic vacum pump somewhere?

Ya gotta luv it when you can fix something with a piece of tape!