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Construction Babysitter
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761 Posts
Discussion Starter #1
I very rarely view boost thru my scan gauge, but yesterday morning I started the truck and it was reading -3.x psi boost at idle. My Isspro boost gauge is reading correctly. Both go up and down with normal driving like usual, just the scan gauge reading starts out as a negative number. I am assuming the scan gauge gets its info from the map sensor. Is this an indication my map sensor is going bad? Never heard of these things going bad.

Thanks
 

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Premium Member
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15,561 Posts
are you sure the scan gauge is reading boost and not (kpa?) I know on my truck it would read a constant -14.0 tho but I never set up the gauge to read boost of the pcm.
 

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Chachi
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237 Posts
if its in the negative could that be the vaccume psi?
 

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Construction Babysitter
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761 Posts
Discussion Starter #5
I don't think I actually have negative boost because my real boost gauge is reading correctly. But since my scan gauge is reading what the computer is seeing from the map sensor, I would think a negative boost number could have some effect on how the truck runs.
 
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