Question about 2003 Buick Century

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2003 Buick Century 3.1 liter V6

After replacing the intake gaskets, I find that the engine surges -- a vacuum leak(?) -- as I increase rpms and then it seems to "stumble" and will not develop full power.

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Make sure the idler motor is conected and wires are free and not stuck under the intake, and also check the pcv valve lines for proper routing, also check the line going to the vacium booster for brakes, and one of the ways to find vacium leaks is by aplying brake or carburetor cleaner to the suspected area and that will change rpm when leak found

Posted on Jun 17, 2008


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Sounds like you have a vacuum leak. If you have the V-6 engine, those have a PCV hose under the upper intake plenum that likes to leak. You will need an upper intake gasket set, a new PCV Valve, and some PCV rated hose to fix it. DO NOT use regular vacuum hose on the PCV or you will be doing it again in about 6 months. Standard vacuum hose breaks down rapidly when it is exposed to engine oil.
Check all your other vacuum hoses first. Fix any leaks you find. If you don't find anything else leaking, then the hose under the plenum is your most likely suspect.

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This is a vacuum leak problem, when your engine surges. To make sure that this is correct spray either where all vacuum leaks can occur

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