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Old 08-11-2004, 06:36 PM   #1
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Default Boost gauge concern

First off do I have 2 MAP sensors? I see what looks like 2 behind the fuel rails, but are they for the same purpose?

Anyway, my boost gauge kinda fluxes about a bit when driving along normally and sometimes at idle. I noticed with my setup back at Bfest the gauge was barly getting to 10psi, but the Autotapped showed a true 12.7psi, so the gauge is being a little funny. Now with my current setup I'm pegging that sucker like hell, but its still eratic. What could be causing this? What lines feed the gauge and what/where are the related sensors?

This is nothing major, but the gauge is a poorly designed OEM baseline of measurement and I still have no real clue unless I have it Autotapped again.

BTW: No loss of power, surges, or anything strange show up in Autotaps or Scantools...so nothing is mechanically damaged as far as I know.
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Old 08-11-2004, 06:50 PM   #2
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One of the map sensors is for the gauge and one for the pcm. The gauge draws its vacum from under the nose cone I belive. You may have a crack in one of the vacum lines?
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Old 08-12-2004, 06:34 PM   #3
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I wouldn't doubt a crack. Can you post a pic please? (I think I know which one)
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