Question about 2001 Pontiac Bonneville

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2001 pontiac bonneville exhaust smells sweet like antifreeze also has a #4 misfire code head gasket or intake gasket

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Probably upper intake manifold leaking. These have no head gasket problems.

Posted on Jan 25, 2011


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What causes the van to smoke it sounds like the exhaust brake is leaking

head gasket leaking antifreeze into cylinders makes them smoke white smell the exhaust and if it smells sickly sweet get it looked into . never heard of an exhaust brake .

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Sounds like you have a blown head gasket and coolant is getting into one of the cylinders.

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Coolient leak but not on ground where does it go

Check the oil dipstick for water or antifreeze, also with car running go to the rear and see if you can smell antifreeze from your exhaust. If either of these are a yes you have a blown head gasket, a cracked head, or even possible a bad heater core. Is there moisture on the passenger side floor pan? If there is moisture there then a your heater core is bad.

May 20, 2011 | 1996 Pontiac Bonneville SE CA Value

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There is white smoke coming out the tailpipe no smell of antifreeze

If it doesn't smell like sweet then you most likely got a bad tank of gas. Just to be safe keep an eye on your engine temp. and coolant levels.

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My 1998 vw Jetta is using alot of antifreeze. We replaced the thermostat but are still losing antifreeze. there is no leak that we can see. Also our heater is not working very well, what could be the...

does the exhaust blow white like smoke? if so does it have a sweet smell? bad head gasket. Is the oil check at full or is it overfull? bad intake or head gaskets.

Feb 07, 2011 | 1998 Volkswagen Jetta

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White Vapor from exhaust and I think the water vapor contains antifreeze in exhaust pipes?

If you "smell" the exhaust it will smell sweet if it has antifreeze in it. If that's the case then you might have bad head gasket(s) or cracked head(s) or block. If in fact it is antifreeze in the exhaust, a "leak down" test will help diagnose this. I would take it to a shop that you trust for further testing.

Jan 31, 2011 | 2004 Jaguar XJ-Series

1 Answer


First check the two 3/4" hoses going into the firewall. if those are clean, it will be a blown head gasket. Are you getting a lot of white smoke and sweet-smelling exhaust? If so, you're leaking antifreeze into the cylinders too. Also check your oil for frothyness or greyish oil (using dipstick) - if that's true, antifreeze is in your oil. All of which are conditions of a blown head gasket - it just depends where the gasket failed.

IF it's only leaking on the outside of the engine, you can try a stop-leak coolant additive. These only work if you're only leaking on the outside - will not work if leaking in the oil or in the cylinders. And then they only work some of the time - I have had it work with perfect success in the one time I used it (was a copper color liquid). Sometimes that's better than putting in the money to replace the gasket...

Jan 23, 2011 | 2001 Isuzu Rodeo

2 Answers

Lacking power, funny smell near exhaust and sputters and feels like it is going to stall when stopping for a red light.

Rotten egg smell is usually a bad converter. sweet smell is antifreeze meaning blown head gasket or worse.

Jan 22, 2011 | 2001 Chevrolet Cavalier

2 Answers

White smoke from exhaust pipe..

White smoke is a sign of coolant being burned in the exhaust.

Jul 05, 2010 | 2003 Ford Explorer

1 Answer

Montero Sport 2001 - white heat coming out after idling for a while and you hit gas. Smells like burnt after getting home. Repair shop says it need new engine. I'm frequently adding oil, but not huge...

Check for oily mixture in your antifreeze. Also check for antifreeze in the oil. You could do a compression test to verify, but it sounds very much like you have have a failing head gasket, or possible a cracked head. There are some liquid head gasket repairs available at auto parts stores that may help, or at least keep it from getting worse for a while. The white vapor from the exhaust is antifreeze burning off. It may have a slightly sweet smell. If untreated, the vehicle will eventually overheat and the engine will fail completely.

Nov 18, 2009 | 2001 Mitsubishi Montero Sport 4WD

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