Question about 1998 Pontiac Bonneville

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Intermittent white smoke out exhaust and engine misfire

Car has always run great but lately the problem above. A mechanic checked it out and changed coil packs, spark plugs and wires. Ran good for several days then same problem.

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  • yadayada
    yadayada May 11, 2010

    u are burning oil

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The piston rings in your engine might be needed to be replaced already... go to a local shop with a compression tester.. have your engine tested for compression leaks.. if it does have compression leaks.. then you need to change piston rings. Note** white smokes = engine is burning oil..

Posted on Jun 25, 2009

  • Jac Lawrence Pimentel
    Jac Lawrence Pimentel Jun 25, 2009

    another possible source of white smoke is cold weather.. but, to be sure, have your engine tested for compression leaks

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Check the plenum (upper manifold) I had the same problem and coolant was entering the manifold through a pin hole in the plenum (front near the vertical tube) I was losing coolant slowly. Fixed the pin hole with high temp epoxy and been running great for a long time

Posted on Sep 05, 2009

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3 Answers

What is the cause of white smoke from the exhaust and fuel smell?


Not knowing the age and mileage of the car my answer can only be a general one and as always if you are in any doubt get a good mechanic to look at it. Keep checking both the oil and coolant. The loss could be two separate issues.
You will need to check the smoke in a bit more detail. Does the smoke linger or does in disappear quickly? Thin smoke that disappears quickly is not something you need to worry about unless it gets worse and cold weather makes exhaust fumes more visible.
"White" smoke can actually be one of three colours. White, blue or grey. Get a helper to sit in the car and gently press the accelerator pedal steadily for 2 to 3 seconds then release. Repeat 2 or 3 times. Watch the smoke to see if has a blue or grey tint, or whether it is white. Each colour suggests a different problem. See the photo below.

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2 Answers

My car has white smoke coming from the exhaust


he causes of white exhaust smoke can vary; however, it is common to see white exhaust smoke when first starting a car, especially on cooler days. This is generally steam caused by condensation. As the engine warms up and the condensation dissipates the white exhaust smoke (steam) is no longer seen. If excessive white exhaust smoke is present well after the engine warms up, it is necessary to have the car inspected for possible internal coolant leaks. Indicators of an internal coolant leak include billowing white exhaust smoke accompanied by a sweet odor or a low coolant reservoir level. An internal coolant leak can also contaminate the engine oil giving it a frothy, milky appearance. Even small amounts of coolant entering the combustion chamber will produce white exhaust smoke.
One of the main causes of white exhaust smoke and coolant loss is a cracked or warped cylinder head, a cracked engine block, or head gasket failure caused by overheating. A cracked head may allow coolant to leak into one or more cylinders or into the combustion chamber of the engine. Dirty coolant, a poorly maintained cooling system, a low coolant level, or a non-functioning cooling fan can cause engine overheating. In addition, engine wear can eventually cause the gaskets to lose their capacity to seal properly allowing internal coolant loss. Intake manifold gasket and head gasket failures are two of the most common sources of internal coolant loss caused by engine wear.
Never remove the radiator cap or coolant reservoir cap while the engine is hot or running as it can cause serious injury; always allow the car to cool down completely first. Checking for a low coolant level in the reservoir is the first step in determining if coolant loss is causing the white exhaust smoke. If the coolant reservoir is at the proper level but excessive white exhaust smoke is present, a cooling system pressure check is required to determine where, if any, coolant leaks are located.

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Why is white smoke issuing from exhaust?


White smoke is coolant burning. Check radiator for oil and check oil cap for foam if you have one or both not good.

Aug 18, 2015 | 2010 Lincoln MKT

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My 1998 Mazda millenia Is shorting white smoke more tell pipe what could be the problem


It is common to see white exhaust smoke when first starting a car, especially on cooler days. This is generally steam caused by condensation. As the engine warms up and the condensation dissipates the white exhaust smoke (steam) is no longer seen. If excessive white exhaust smoke is present well after the engine warms up, it is necessary to have the car inspected for possible internal coolant leaks. Indicators of an internal coolant leak include billowing white exhaust smoke accompanied by a sweet odor or a low coolant reservoir level. An internal coolant leak can also contaminate the engine oil giving it a frothy, milky appearance. Even small amounts of coolant entering the combustion chamber will produce white exhaust smoke. One of the main causes of white exhaust smoke and coolant loss is a cracked or warped cylinder head, a cracked engine block, or head gasket failure caused by overheating. A cracked head may allow coolant to leak into one or more cylinders or into the combustion chamber of the engine. Dirty coolant, a poorly maintained cooling system, a low coolant level, or a non-functioning cooling fan can cause engine overheating. In addition, engine wear can eventually cause the gaskets to lose their capacity to seal properly allowing internal coolant loss. Intake manifold gasket and head gasket failures are two of the most common sources of internal coolant loss caused by engine wear.
Never remove the radiator cap or coolant reservoir cap while the engine is hot or running as it can cause serious injury; always allow the car to cool down completely first. Checking for a low coolant level in the reservoir is the first step in determining if coolant loss is causing the white exhaust smoke. If the coolant reservoir is at the proper level but excessive white exhaust smoke is present, a cooling system pressure check is required to determine where, if any, coolant leaks are located. THESE LEAKS WILL CAUSE SEVERE ENGINE DAMAGE! Have the car inspected immediately.

I
Internal coolant leaks can and will cause

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Hi, My Sidekick starts to "putter" as i drive like it's not getting enough fuel. Then when I accelerate it blows large amounts of white smoke out the exhaust. It did this once before last summer...


White smoke always means that oil is getting into the cylinder. This will make the car sputter. You have to find out why the oil is getting in there. It needs to go to a mechanic because it could be any number of reasons why the oil is getting in.

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1 Answer

Engine misfire


White smoke usually indicated it's burning antifreeze. Check your antifreeze level and oil condition before anything.

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2002 Ford Expedition - service engine soon light came on. I went to Autozone for them to read the codes...it came back O2 sensors, ignition misfire, and fuel injector problem. Ocassionally, I will have...


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Black smoke coming out of exhaust, only on immediate acceleration. Leaves black spots on ground under exhaust pipe.


Your engine is running "too rich" meaning more gas is going into the chamber than is supposed to. If it is a late model, to need to see your mechanic. FYI , blue smoke is oil, black too much gas, white, antifreeze, (really bad).

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the white smoke as it stalls could be steam in the exhaust. This is caused by coolant leaking into cylinders from a leaking head gasket. You should check cylinder compression next with a compression tester.

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I have a 1995 Nissan Pulsar and had the same problem with the engine just as you explained, with the white smoke and backfiring, the problem was the pcv valve had failed and the oil was being sucked from it through the vacuum pipe attached to it. the oil would go into the inlet manifold and go into the combustion chamber. I had practically changed everything around the engine block before finding the problem. And also, the MIL light never came on.

Best Of Luck.

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