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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If coupling didn't fall of throttle linkage and if there's current past the CC switch, the vacuum hose fell off or you have a big problem starting to happen with intake manifold leak. Start engine, spray brake cleaner around intake gasket, if rpms speed up, you have bigger problems than CC but CC will show first. If no rpms increase and you have juice, replace CC unit.

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I had an '87 Celica doing the same thing and it was an intake manifold gasket that wasn't sealing-pulling in a lot of air. A lot more than a vacuum hose leak, which would only raise the idle a bit, but not cause the surging you are having and that I had. So check for a large air or vacuum leak. A rip or hole in the large intake boot may also be the source.
To check the manifold gasket, get a spray bottle filled with water and have someone keep the engine running at around 2000 rpm or higher. Soak the area all around the intake manifold gasket, wet it down pretty good. If any leaks are there, the water will get sucked in and cause a noticeable stumble in the engine, may even try to die. Check all hoses for vacuum leaks too, the large hose to the power brake booster.
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.
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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