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Hey guys

Recently my stock boost gauge has been showing weird values. It basically won't go any lower than the -3.5 mmHg mark. Even under engine braking, where it used to go down near -7, it now won't go below -3.5. It also idles at -3.5. If the actual pressure was -3.5 though, I'm thinking it wouldn't idle at the usual 800rpm, but would idle much higher due to there being more air going in; however the idle is fine.

Above that -3.5 mark, it appears to be accurate - at full boost it's showing what it always did. I know the needle's not stuck at that -3.5 point too, because as soon as I turn the car off it goes down past the -7 mark.

So I'm thinking maybe there is a leak where the gauge takes it's reading from? What else could it be?

Hope the above makes sense. Ideas would be much appreciated!

If the reading you get on the high RPM overrun (when engine braking) was the same as idle.. you'd be in a world of worries :(

Its very unlikely, your readings are correct. Borrow a mates vacuum gauge, as the stocker isn't really that good diagnoses tool.

If you like to tinker, you could make your own vacuum gauge. See AutoSpeeds website for the article.

  • 2 weeks later...
If the reading you get on the high RPM overrun (when engine braking) was the same as idle.. you'd be in a world of worries ;)

Its very unlikely, your readings are correct. Borrow a mates vacuum gauge, as the stocker isn't really that good diagnoses tool.

If you like to tinker, you could make your own vacuum gauge. See AutoSpeeds website for the article.

Thanks, friend plugged his gauge in and it showed -18psi or so at idle. Then I found a crack in the stock gauge hose, just cut the end off and reattached, no problem now :D

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