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#1
01-06-2011, 03:30 PM
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04 GTP loss of boost
Last night I was driving home from work and notice a loss of power. I turned on the boost gauge and it only read boost if I jumped on the throttle, and even then it was only about half for a second or two. The car doesn't seem to be running any different except for that.
I have read all I could find and I am thinking that it may be a loss of vacuum or a stuck bypass valve. Any ideas? The car has about 160k miles if that matters. 
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#2
01-06-2011, 07:27 PM
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Re: 04 GTP loss of boost
Make sure the belt is good on the supercharger.
Are you sure your losing bost, or is the guage lying to you? I am unfamiliar to the series III 3800SC motor, but on the Series II, there is a sensor that measures boost. The vacuum line that leaves the bottom of the lower intake manifold on the passenger side of the motor, supplies vaccum/boost to the sensor. If your motor has this vacuum line, make sure its connected and not cracked.
__________________
-2000 Grand Prix GTP 170,000mi (daily driver) -2000 Olds Alero 100,000mi (soon to be DD with gas at $3.45/gal) -1997 Chev K1500 4x4 115,000mi (Natalie's truck [nans_grandprix]) AF "2.0" Community Guidelines Conservative Victory 2012!!! "I'll Keep my Guns, Freedom, and Money. You can Keep the Change!" ----->>>>> Did You Know? <<<<<-----
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#3
01-06-2011, 09:02 PM
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Re: 04 GTP loss of boost
Seems like I am down on power, but I am not sure if it is the gauge or an actual loss in boost. I will check the belt. I tried looking and all hoses look ok, but I didn't have very good light.
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