Thread: No Boost

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  1. #1 No Boost 
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    I Got A 98 GTP and It's Running Good But it Ain't Throwing Boost my Mechanical said it my be the sc bypass solenoid but not sure and plus I can't find that part in any store Wat can I do? Or where can I find it?
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  2. #2 Re: No Boost 
    Donating Users alkygto's Avatar
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    So....it's running "good" like no difference in performance? Just not showing boost on your DIC?

    There is no bypass "soleniod", it is a vacuum pod and it's on the side of the supercharger facing you, Its black and has a little lever attached to a butterfly valve under the supercharger.I would check all your vacuum lines going to it and look for leaks.

    Maybe consider (at least temporarily) hooking up a mechanical boost gauge. You can get them at Autozone for under $20.

    1997 Pontiac Grand Prix GTP
    1969 Pontiac GTO
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  3. #3  
    GrandPrix Junkie Bluemagic's Avatar
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    Actually there is a Boost solenoid. It's Located under the BBV. It's a small black rectangular box. Checked to see if it's connected. Also unplug the lower hose that connects to it and see if you car shows boost.
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  4. #4 Re: No Boost 
    Donating Users alkygto's Avatar
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    Quote Originally Posted by Bluemagic View Post
    Actually there is a Boost solenoid. It's Located under the BBV. It's a small black rectangular box. Checked to see if it's connected. Also unplug the lower hose that connects to it and see if you car shows boost.
    Well, shows what I know. Ya learn something every day. Thanks!

    1997 Pontiac Grand Prix GTP
    1969 Pontiac GTO
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  5. #5 Re: No Boost 
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    It's showing boost but you can't feel it like if the boost is really low
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  6. #6 Re: No Boost 
    GTP Level Member indygrandprix's Avatar
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    Is it still showing the same amount of boost it always has or is it lower?
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  7. #7 Re: No Boost 
    GTP Level Member KeithGTP03's Avatar
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    Hold the lever down on the Boost Bypass Valve, have someone sitting in the car give it throttle and watch the boost. If it fills up, replace the BBV.

    03 GTP...Its got pulleys and stuff.
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  8. #8 Re: No Boost 
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    We had already done that and it just reads all the boost up so I'm guessing its the bypass solenoid but I can't find part in any autopart store
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    GrandPrix Junkie Bluemagic's Avatar
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    Try asking in the want to buy section
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  10. #10 Re: No Boost 
    GTX Level Member GTPSHAWTY's Avatar
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    any ses light.. check fuse 21 underhood
    CTRACER: YOU SHUT YOUR MOUTH WHEN YOUR TALKING TO ME
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  11. #11 Re: No Boost 
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    i had the same problem rockauto.com has them for $30 i believe or you could just run without it... ive been running no boost control solenoid (little black rectangular box) for over 30k and had no problems... just run the line from your vacuum tree on the sc to the top port on bbv and the bottom port to open air or your intake somewheres...
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