Thread: boost gauges not working? and no boost at full throttle

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  1. #1 boost gauges not working? and no boost at full throttle 
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    Hey guys, I am trying to figure out why I have no boost and no vacuum in my car. even at full throttle there is nothing. and at park, in my 1997 gtp my in dash boost gauge will slowly go up. but im not on the gas, nor am i moving. please help! also! i am also running a 3.6 pulley, ( yes with supporting mods) i just pullyd up from a 3.4. it couldnt have been from me going up could it have?
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  2. #2 Re: boost gauges not working? and no boost at full throttle 
    I break things. WarStryker13's Avatar
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    What supporting mods? And it could be just a simple MAP sensor.

    04 GP GT2: Handling upgrades, go-slow parts, and an attitude. Totaled.
    87 Dodge Ram 50:​ Junkyard rescue, resurrection in progress.
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  3. #3 Re: boost gauges not working? and no boost at full throttle 
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    headers, exhaust, tune, intake. If it is just the map sensor ill be happy... easy fix, right?
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  4. #4 Re: boost gauges not working? and no boost at full throttle 
    GrandPrix Junkie SgtMarshal's Avatar
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    sounds like a vacuum leak, what are your fuel trims at when the car is idling?
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  5. #5 Re: boost gauges not working? and no boost at full throttle 
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    well, i have a pre-cat exhaust leak. but that is just making my car surge at idle. I dont know what the fuel trims are, but you can smell the fuel running rich ( assuming that since my leak is between 2 o2 sensors its trying to compensate for something that isnt there. I've checked my lines i didnt see anything...
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  6. #6 Re: boost gauges not working? and no boost at full throttle 
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    You have a busted vacuum line. Follow them around and you will find it. The MAP gives you the signal for your boost gauge.

    Jeff
    An engine is an engine no matter the size.... I think Dr. Seuss said that... or maybe it was Big Weld....
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  7. #7 Re: boost gauges not working? and no boost at full throttle 
    GrandPrix Junkie CrazyGuy03's Avatar
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    I responded in chat
    2003 Buick Regal GSX lots of mods - click here to see latest build - http://www.grandprixforums.net/threa...ld-for-the-gsx

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  8. #8 Re: boost gauges not working? and no boost at full throttle 
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    thanks guys
    ill see what I can do.
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