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Re: 2003 Buick Century 3.1 liter V6
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
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recheck the gaskets possible vacuum leak --others are plugs not gapped right-plug wires not on correctly or damaged/worn popped or damaged vacuum line --sensors to throttle body not connected or damaged ---throttle body needs relearn ---
Aaron, there has been a few problems with head gaskets, the bigger problem was with the intake manifold gaskets.
Check the attached links,
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Coolant leaks,When the intake manifold gasket cracks or blows out, coolant will leak out of the intake manifold. You may see puddles underneath your car or notice smoke or steam coming off of the engine and exhaust from the coolant dripping onto it and then burning.Overheating, If the intake manifold gasket fails and allows coolant to leak out into the engine, your car will begin to overheat. If your car frequently runs low on coolant or begins to overheat, check the intake manifold gasket.Running poorly, When the intake manifold gasket falters, it affects the way the motor handles its emission gases. The change in pressure can affect the vacuum in the intake as well as how smoothly your car runs. Mainly, it will idle roughly and may hesitate, cough or sputter.
I'm not certain if it would physically bolt in, but it would be a nightmare to get the electronics working properly. I found that the 3.4L isn't a bad engine, aside from intake gasket leaks. There is an updated intake gasket set available that seems to be working great.
All engines have vacuum created in the intake manifold, because the pistons are pulling in air into the cylinders from the intake manifold, resulting in a pressure drop in the intake. A leak is caused when the intake manifold gasket is bad, or when a vacuum hose off the intake becomes disconnected or breaks. The hose will then **** extra air into the intake, causing a higher than normal idle, maybe a rough running condition, and can be identified by a slight whistling noise at the break or at the disconnected end of the vacuum hose.
Your vehicle has four oxygen sensors. There is a vacuum line underneath the throttle body that regularly fails, causing the lean condition, and the whistling and surging. Very dificult to see, but with the engine running usually you can fine the vacuum leak with your fingers. Hose is non-reinforced rubber, and is shaped in a 90 degree bend. If memory serves me right, it is the pcv hose. Replace this and your problems will cease.
If you have a 3.1L or 3.4L V6 engine, I can guarantee you have either an intake manifold gasket leaking, internally, or the rear head gasket is leaking externally. They are extremely prone to coolant leaks for both. Get it checked out soon, the head gasket job can cost upwards of $1000.00. The intake leak is half of that if caught in time.
If the check engine light is flashing this indicates that a cylinder or cylinders are misfiring.If the rpms are increasing you may have a vacuum leak causing the misfire. Would check for any disconnected vacuum lines or a possible plenum/upper intake gasket leaking. To do this you can spray induction cleaner around the upper plenum to check and see if the gasket may be leaking.
I have the same codes on my 2003 Explorer 4.0 Liter V6. I was told many things from bad fuel pressure to bad computer. One peice of advice was correct. Bad air fuel mixture caused by a vacuum leak. The leak could be from a bad vacuum hose or the intake gasket. Mine turned out to be a hole in an elbow vacuum hose on the top of the engine, passanger side, near the intake. Fixed and runs great with no more check engine light.