Vacuum at 0 by during wot?

[Kong76]

I have been suspect of either a vacuum leak or a partially clogged cat. At idle my vacuum is at 19.2 and pretty steady. When I punch the throttle in neutral the gauge drops immediately to 0 and then jumps to 22hg. Flooring it in second gear, the gauge drops to 0 hg and stays there for the most part oscillating to .6 hg until I shift and then it jumps to 23 hg. Getting back on the gas it goes back to 0. Is it suppose to stay at zero the whole time I am at wot?

Been having some random mini backfires and sulfur smell at wot in trunk. Car just feels funky. No cels.

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[TGGT]

Sounds normal. Engines make no vacuum at wot

 

[Jetnoise]

If It wasn't at zero on wot there maybe likely something wrong

 

[Kong76]

Thanks for the feedback fellas. If thats normal than I need to look elsewhere.

 

[GT Pony]

Zero gauge vacuum is essentially atmospheric pressure. Sounds like normal vacuum gauge operation to me as you described it.

 

[Hooch180]

Vacuum is made by obstruction of intake. When there is not obstruction (WOT) there will be now vacuum. As for your other issues. Look somewhere else. What do you mean by backfires? There can't be a backfire on non carburetor car as the intake valve is closed before the ignition. And how do you know that it is backfire?

 

[VinnAY]

Been having some random mini backfires and sulfur smell at wot in trunk. Car just feels funky. No cels.

A backfire is exhaust back the intake, are you sure you're accurately describing a "backfire", too, maybe you're smelling the cats, they have a distinctive almost sulpher like smell when WOT.

 

[Kong76]

Well I had one the other morning that made me duck my head thinking it was a gun shot. Not sure if it's intake related or exhaust but it was loud.

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