08-10 SS Turbocharged General Discussion Discuss the 2008 - 2009 Chevy Cobalt SS Turbocharged. On sale since the second quarter of 2008.

holding boost issues...

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Old Jul 7, 2011 | 05:51 PM
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Souperman's Avatar
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Unhappy holding boost issues...

When i go into full boost with my car it makes a loud pop and loses all boost until i let off the petal and press it down again and continues to keep doing that. I have replaced the lower map sensor and new plugs. Never started doing it until i put the inter-cooler on and i cant seem to figure out what is causing it and i would def like it fixed cause its depressing to not be able to get into my car and not be able to hold boost. Any ideas what would be causing this
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Old Jul 7, 2011 | 06:02 PM
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sounds like a chargepipe blowing off but doesn't make sense that it would work again right after, maybe not blowing off completely that would be very odd though...
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Old Jul 7, 2011 | 06:10 PM
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Originally Posted by Souperman
When i go into full boost with my car it makes a loud pop and loses all boost until i let off the petal and press it down again and continues to keep doing that. I have replaced the lower map sensor and new plugs. Never started doing it until i put the inter-cooler on and i cant seem to figure out what is causing it and i would def like it fixed cause its depressing to not be able to get into my car and not be able to hold boost. Any ideas what would be causing this
Sounds like one of the pipes/hoses connected to the new IC is letting go. I take it you swapped out new hoses/fittings on the IC? Those have to be on super tight and fit properly.
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Old Jul 7, 2011 | 06:12 PM
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yeah i will reach full boost through the tune and gms1 but it seems like right when it hits higher boost levels it just cuts out and loses boost. once i take my foot off and press it back down its back then cuts out. i have no idea what the problem is and its frustrating so im throwing it on here to see if anyone has had this problem

Originally Posted by ronn
Sounds like one of the pipes/hoses connected to the new IC is letting go. I take it you swapped out new hoses/fittings on the IC? Those have to be on super tight and fit properly.
okay ill def check those out thanks

Last edited by Souperman; Jul 7, 2011 at 06:12 PM. Reason: Automerged Doublepost
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Old Jul 7, 2011 | 06:24 PM
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Would the stock coldside piping be a issue or problems with my mods since its pretty much only I haven't upgraded
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Old Jul 7, 2011 | 07:34 PM
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Wrenched down on all the tbolt clamps and well its running like old again thank you for the advice
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