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

White smoke started coming out from exhaust, I checked the fluids and noticed that the coolant was empty I had only filled it 4 weeks ago and the oil was low. Filled them both up but smoke still coming out and smells like burning. Thought it was a broken head gasket but no sludge on oil cap, and took radiator cover off started car and there was no bubbles. The coolant is still full today so pretty certain it's not leaking. Does anyone know what to do?

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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.

What is the cause of white smoke from the exhaust  - 6fb0cd85-8f7f-48fb-8824-6cd42527382d-53aq2xfzzsjagfqehrjrbcpn-3-0.png

Posted on Jan 18, 2018

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White smoke can be caused by many reasons. But if you get white smoke from exhaust at startup, it might be from these reasons:
- A cracked or warped cylinder head.
- Head gasket failure
- Cracked engine block
One of the most common cause, cracked engine block may allow coolant to leak inside the engine combustion chamber and cylinders, which is very dangerous and requires special attention.
The engine misfiring and pushing raw fuel out. In those cases, the car will be running rough and driver can smell a raw fuel smell.
In order to fix this, just check the fuel and replace if necessary.
I found this one would be a good help for you:
https://carfromjapan.com/article/car-maintenance/white-smoke-from-exhaust/
It covers several cases related to white smoke and quick way to check and fix.

Posted on Jan 18, 2018

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Pressure test the cylinders as if the head gasket is leaking, antifreeze will produce white smoke.

Posted on Jan 18, 2018

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Posted on Jan 02, 2017

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SOURCE: White smoke coming out of exhaust even when engine is warmed up.

on the 3.8 ussaualy not the head gasket but the upper intake gasket . antifreeze leaks inside intake and into the cylinder. very common. the new gaskets are much thicker.or the plastic plenum the black plastic part on top of the engine goes bad around the water inlet and need to be replaced . when i do either job itell the person to replace both at same time saves money and headaches in the near future. hopes this helps .....and cost for a shop to do this $1100 to $1500

Posted on Dec 08, 2008

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SOURCE: Low coolant and oil smells like gas. No white/blue

let your car idle go back to the tail pipe if it seems to be steaming alot , and or smells like antifreeze then you have a head gasket problem or a gasket leak alowing in directly into your engine

Posted on Apr 28, 2009

  • 2973 Answers

SOURCE: White smoke and the smell

Bradley,
You have stated two problems. Coming to second first. Smell of burning rubber. in the car rubber is only at two places where it can burn, The tyres, unlikely as you have not commented upon your driving habits. Some people like to rev the engine so much before take off that the tyres go burning for the first few hundred meters. And then there is rubber on the wires and cables. You have to check the wires for any heat while the engine is running.
Coming to the first now. White smoke is generally of unburnt fiel and not oil. Oil alwayd give black smoke and that is the indication you get when the exhaust is giving black smoke. That means that the engine is consuming oil. if it is white then that indicates that the engine is cold and burning more gas/diesel. Is your a diesel vehicle?? But as you say it from under the hood. And that too behind the engine block. May be that the gasket is leaking from somewhere. If you could check the engine oil level for a few days early in the morning before starting the engine. If the level drops and the exhaust tail pipe does not blacken your finger when you rub it in it would mean that the oil is being burnt. Now what I suggest is that with the engine running and hand brakes on, go under the car with hood open and try to locate the source of the smoke. I am sure you would be able to locate it.
Then we talk again.

Posted on Dec 23, 2009

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SOURCE: 92 isuzu pickup head gasket repair

YOU NEED TOOLS AND A HAYNES REPAIR MANAUL TO SHOW AND TELL YOU HOW HEADS ARE REMOVE.YOU NEED A STRAIGHT EDGE LIKE FRAMING SQUARE AND FEELER GAUGE TO DECK THE THE HEAD TO CHECK FOR WARPAGE.OR THE MACHINE SHOP CAN CHECK WARPAGE ON HEAD.SEE IF REPLACED HEAD GASKET AND DONT CHECK WARPAGE WHICH SHOULD NOT EXCEED 0.004 INCH.IF SO YOUR NEW HEAD GASKET WILL LEAK ALSO.

Posted on Apr 10, 2010

  • 5 Answers

SOURCE: 1993 saab turbo CSE. limphome mode, possible head gasket leak

I had a blow head gasket on my BMW 6 cyl. and it was blowing white smoke and losing alot of coolant. After doing alot of research I found that all the other brands like blue devil, steel seal, KW and bars all use water-glass. The only company that does NOT USE WATER-GLASS is Dura-Seal. If you have aluminum heads it's very important to use a sealer that can flex with your engine's aluminum heads. The DuraSeal actually stays flexible! So I tried it and it stopped the smoke and overheating. No more coolant loss either. It's been running fine for over a year now. I would reccomend Dura Seal head gasket sealer to everyone... Great product! Also the tech department guys really know what they are talking about...

Posted on Nov 09, 2012

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