Chevy Blazer
Check Engine Light
Chevy Blazer S-10

The 'service engine soon' light is on in 1995 Chevy blazer code reads 'EVAP vacuum switch high voltage during ignition on' how do you go about fixing that?

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September 13, 2011 3:24PM

your vacuum switch is located on the intake manifold to the rear passenger side, it might be stuck open therefor putting out high voltage readings, that's how your computer fugures out if it's open or closed.


You might try checking out your emission's systems (misspelled) because it might have something to do with that.


Check if you got hose off at air cleaner!:) Good Luck!

Replace your gas cap! Yes, it might be that simple.