Question about 2000 Pontiac Bonneville

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My 2000 bonneville 3.8 v6 SE bogs, chugs, sputters and evetually stalls when the motor gets hot (not over heating) and won't run again until it has cooled down completely. No idiot lights come on. It will run rough if I click the key over the on position and back to acc a few times but will eventually stall again. I replaced the fuel filter. Nothing. Scanned it. No codes came up. Can somebody please tell me what is wrong with this car?

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Have your catalytic convertor checked

Posted on Jul 07, 2010

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Faulty coolant system gaskets are allowing coolant into the block. You will notice a sticky sweet smell as it is running rough. You will need to replace all the gaskets (2 gaskets and one "elbow") from the coolant system to the engine. Not fixing this problem can cause a cracked head gasket. Check the area to the passenger side of the engine near the coolant tank, you will see a bolt on the block itself with an exposed nut. If this area is greasy, wet or otherwise corroded your system is leaking into the block.

Posted on Dec 13, 2010

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If it is carbureted, the choke is stuck or broken.

If it is fuel injected, the engine temperature sensor is not working, and the electronics believe the engine is still cold when it is not.

Posted on Jul 07, 2010

  • BrianWren Dec 13, 2010

    Coolant leaks, following having warmed the engine, get WORSE with cool-down, not better. The warm engine has pressure in the cooling system, and the time to cool down allows time for seepage.

    Of course, there is always coolant in the block (in the water jackets), so I presume you mean into the area where the oil is. This will not cause any of the symptoms mentioned.

    If you mean that the head gasket is leaking, a head gasket leak affects one, or at most two, cylinders. Plus, a warm engine handles water being injected into the combustion process just fine, though a cold engine might not. But this car starts OK cold, but fails on warmup. And a severe enough leak to kill the engine will drain the whole cooling system in short order,

    There is no water leak theme I can think of that would cause these symptoms.

    And finally, heads can crack, but head gaskets don't. And a coolant leak will not cause any cracks anywhere unless the coolant runs out, and the engine overheats. But this engine won't run long enough to overheat, with the troubles it is having.

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