My vacuum is reading -10!!!!
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This is a discussion on My vacuum is reading -10!!!! within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Engine light came on in my 05' WRX yesterday and noticed my vacuum is reading -10, got codes read, said ...

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    My vacuum is reading -10!!!!

    Engine light came on in my 05' WRX yesterday and noticed my vacuum is reading -10, got codes read, said it was a high exhaust temp.. Dealership cleared it cause of my boost controller. Was talking to another mechanic who said he thought it could be something slowing my exhaust flow, oil leaking into the cat or something else obstructing the flow. anyone ever hear anything like this or know of any other things that could be causing this problem?

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    The Fruit mangostick's Avatar
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    Vac leak and running lean can cause higher exhaust temps.. Check over the entire intake tract including bpv/bov and all vac lines. Something is letting excess air in.

    Is your Idle rough as well? Textbook telltale sign you have a vac/boost leak in the intake tract.
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    Ill check on that tomorrow thanks. To answer your question, no, it seems to be running smooth

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  6. #5
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    the vacuum side inhg, or inches of mercury, right? yeah im running about 11 psi on the boost end but my vacuum at ideal is reading off at -10 to -12 inHg. When im coasting without giving it gas say in 3rd at a low rpm it will drop to about -18, but as soon as i touch the gas it jumps back to -10 before it starts it climb into the boost side.

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