Thread: Why is my boost gauge only reading vacuum and no boost?

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  1. #1 Why is my boost gauge only reading vacuum and no boost? 
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    i installed my autometer boost gauge in my 02 gtp today and it reads vacuum but when at full throttle it reads no boost
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  2. #2 Re: Why is my boost gauge only reading vacuum and no boost? 
    The Blue One blueguy's Avatar
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    You have a vacuum leak somewhere. Check again.
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
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  3. #3 Re: Why is my boost gauge only reading vacuum and no boost? 
    Donating Users blowfishRus6's Avatar
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    put supercharger belt back on....


    nah i dont know. is it taped into the right place??
    white 04 comg G gtp. wizair, pacesetters, slp 1.8 rr
    its slow.
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  4. #4 Re: Why is my boost gauge only reading vacuum and no boost? 
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    You most likely installed the line in the wrong place. You need to come off the port under the supercharger snout in the lower intake manifold.
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  5. #5 Re: Why is my boost gauge only reading vacuum and no boost? 
    The Blue One blueguy's Avatar
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    ^^pretty sure that is the line off the MAP sensor underneath the EVAP purge lines in the back behind the blower.
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  6. #6 Re: Why is my boost gauge only reading vacuum and no boost? 
    The mod from over yonder TheOtherNick's Avatar
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    Yeah mine is tied in right in front of the map.
    01 gtp-big cam e85 dd 78dodge- guzzling fuel 05 cummins- rollin coal
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  7. #7 Re: Why is my boost gauge only reading vacuum and no boost? 
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    Yeah mine is doing the same thing but I have a 05 GTP, I thought you just had to stick it in that hole above the supercharger?

    ZZP PCM, Wbody PCM, Custom PCM ( the best ), Headers, 3" exhaust, 3.4" pulley, ZZP 10.3 Wires, AL 104's, 160 tstat, 1.9 Rockers, Custom huge cone intake. Gunna push this GTP to the limit.
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  8. #8 Re: Why is my boost gauge only reading vacuum and no boost? 
    DUI BABY Bio248's Avatar
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    nope, that only sees vacuum. find a source after the blower.
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  9. #9 Re: Why is my boost gauge only reading vacuum and no boost? 
    GT Level Member Louie3's Avatar
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    what line? any pics?

    ZZP PCM, Wbody PCM, Custom PCM ( the best ), Headers, 3" exhaust, 3.4" pulley, ZZP 10.3 Wires, AL 104's, 160 tstat, 1.9 Rockers, Custom huge cone intake. Gunna push this GTP to the limit.
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  10. #10 Re: Why is my boost gauge only reading vacuum and no boost? 
    The Blue One blueguy's Avatar
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    from the MAP sensor on the back of the supercharger...it has a big white plug in it. Can't miss it...T off of that line.
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
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  11. #11 Re: Why is my boost gauge only reading vacuum and no boost? 
    GT Level Member Louie3's Avatar
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    Ok I was able to do it. I found another line infrot of the supercharger that I was able to splice into. It works? shows vaccume and boost fine. How much boost should I be making?

    Also how do you wire it so that the gauge can light up?

    ZZP PCM, Wbody PCM, Custom PCM ( the best ), Headers, 3" exhaust, 3.4" pulley, ZZP 10.3 Wires, AL 104's, 160 tstat, 1.9 Rockers, Custom huge cone intake. Gunna push this GTP to the limit.
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  12. #12 Re: Why is my boost gauge only reading vacuum and no boost? 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    5-10 psi, idk because your modded. A stock GTP is around 7-8 psi.

    With your flow mods and such it will cut down on boost PSI, but you still get the power because it flows better.

    Splice the wire into a wire that always gets power when the key is on or buy a TAP A FUSE or ADD A FUSE, thing at a local auto store and use that on you radio fuse.

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  13. #13 Re: Why is my boost gauge only reading vacuum and no boost? 
    Turbo is the way to go. BillBoost37's Avatar
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    Quote Originally Posted by Louie3 View Post
    Also how do you wire it so that the gauge can light up?
    Not being a douche, but you might want to have a buddy with some experience help you. The directions tell you how to light it up. One wire to ground, one to the light circuit.
    I drink..so consider that when reading my posts.

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  14. #14 Re: Why is my boost gauge only reading vacuum and no boost? 
    GT Level Member Louie3's Avatar
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    Quote Originally Posted by Fivefingerdeathpunch View Post
    5-10 psi, idk because your modded. A stock GTP is around 7-8 psi.

    With your flow mods and such it will cut down on boost PSI, but you still get the power because it flows better.

    Splice the wire into a wire that always gets power when the key is on or buy a TAP A FUSE or ADD A FUSE, thing at a local auto store and use that on you radio fuse.

    I'm getting around 10 psi :-)

    This weekend I'm going to tap it in so that when the lights turn on at night the gauge will also

    ZZP PCM, Wbody PCM, Custom PCM ( the best ), Headers, 3" exhaust, 3.4" pulley, ZZP 10.3 Wires, AL 104's, 160 tstat, 1.9 Rockers, Custom huge cone intake. Gunna push this GTP to the limit.
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  15. #15 Re: Why is my boost gauge only reading vacuum and no boost? 
    GT Level Member Louie3's Avatar
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    Quote Originally Posted by BillBoost37 View Post
    Not being a douche, but you might want to have a buddy with some experience help you. The directions tell you how to light it up. One wire to ground, one to the light circuit.
    Its cool man I just thought maybe there would be a wiring kit for it or something thats more of what I wanted to know. I've done wiring on cars but never as new as my GTP

    ZZP PCM, Wbody PCM, Custom PCM ( the best ), Headers, 3" exhaust, 3.4" pulley, ZZP 10.3 Wires, AL 104's, 160 tstat, 1.9 Rockers, Custom huge cone intake. Gunna push this GTP to the limit.
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