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White Smoke From Exhaust- by MLanders86
Started on: 06-01-2014 11:41 PM
Replies: 11 (656 views)
Last post by: dobey on 06-02-2014 03:10 PM
MLanders86
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Report this Post06-01-2014 11:41 PM Click Here to See the Profile for MLanders86Click Here to Email MLanders86Send a Private Message to MLanders86Edit/Delete MessageReply w/QuoteDirect Link to This Post
So I bought a 86 fiero not that long ago, it has 91k on it and I've put 1k on it myself. I've noticed recently that when I start my fiero, (and this only happens after it's been sitting for a while, enough for the engine to cool off), it will produce a white smoke out of the exhaust that has a very sour, pungent/putrid smell to it and the engine will kind of sputter a couple seconds before it starts idling normally. I'm really confused what this could be from? I know I added a oil additive not too long ago when I changed my oil but I'm not sure if that's even have anything to do with it?
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Report this Post06-02-2014 12:08 AM Click Here to See the Profile for PatrickClick Here to Email PatrickSend a Private Message to PatrickEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by MLanders86:

... it will produce a white smoke out of the exhaust


White "smoke" is water vapor. Check to make sure your coolant level isn't dropping. If your coolant level remains constant, then it's just condensation that has collected in the exhaust system.

Blue smoke is oil.
Black smoke is (excess) fuel.

[This message has been edited by Patrick (edited 06-02-2014).]

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Report this Post06-02-2014 12:41 AM Click Here to See the Profile for TweederSend a Private Message to TweederEdit/Delete MessageReply w/QuoteDirect Link to This Post
If it's thick and has a smell like you say, it's possible it's a head gasket and it's burning coolant.

------------------
86 SE Convertible 3800sc 4t65e HD.

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dobey
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Report this Post06-02-2014 10:25 AM Click Here to See the Profile for dobeySend a Private Message to dobeyEdit/Delete MessageReply w/QuoteDirect Link to This Post
If it's just coolant it should smell more sweet like syrup.

If it smells really awful, you are probably burning coolant and have a bad/clogged catalytic converter (as when they go bad, break apart, and clog the exhaust, you will get a smell more sulfuric like rotten eggs or such.
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Report this Post06-02-2014 10:31 AM Click Here to See the Profile for 2.5Send a Private Message to 2.5Edit/Delete MessageReply w/QuoteDirect Link to This Post
Is it a 4 cylinder? Many of them poof a light colored exhaust smoke on startup (I would say light blue). Usually due a leak down of some oil from the valve seals. That is no big deal.
Could also be a leaky injector dribbling gas so when you start it, it runs a little rough because it is technically slightly flooded until it burns that off.
Could be a combo of both too.

Verifying the color of these tiny amounts of fluids after exiting the exhaust is tricky and depends on lighting IMO. Not quite as easy as telling the difference between a white smoking head gasket failure and an oil burning car with terrible rings.

[This message has been edited by 2.5 (edited 06-02-2014).]

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dobey
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Report this Post06-02-2014 11:08 AM Click Here to See the Profile for dobeySend a Private Message to dobeyEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by 2.5:

Is it a 4 cylinder? Many of them poof a light colored exhaust smoke on startup (I would say light blue). Usually due a leak down of some oil from the valve seals. That is no big deal.
Could also be a leaky injector dribbling gas so when you start it, it runs a little rough because it is technically slightly flooded until it burns that off.
Could be a combo of both too.

Verifying the color of these tiny amounts of fluids after exiting the exhaust is tricky and depends on lighting IMO. Not quite as easy as telling the difference between a white smoking head gasket failure and an oil burning car with terrible rings.



It's not that tricky at all. Fuel burning in exhaust is black (carbon deposits in the exhaust gas), oil gives a blue tint to the smoke, and coolant is white (water vapor). If the exhaust is white and only happens on startup then it can be either condensation in the exhaust, or the beginnings of a blown head gasket or cracked head (small enough hole or crack can seal up when the engine warms up). If coolant level is going down, or there are bubbles in the coolant, then it's the head gasket or a crack. If coolant is fine, then it's probably just condensation burning off. If it smells a bit sweet, it's definitely coolant. If it smells awful like rotten eggs or something, then the cat is bad and needs to be replaced. Muffler could also be bad. If it smells less like rotten eggs, and more like urine, then probably rodents got in the exhaust, and possibly died. That will also clog the exhaust and make for rougher starts, and a horrible smell.
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MLanders86
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Report this Post06-02-2014 12:13 PM Click Here to See the Profile for MLanders86Click Here to Email MLanders86Send a Private Message to MLanders86Edit/Delete MessageReply w/QuoteDirect Link to This Post
I checked the coolant level and it's been the same, the smell is definitely sulfuric and white. I recently tried replacing the exhaust manifold gasket and broke bolts off and I'm sure the leak from there isn't helping the situation. It just had me worried it was a blowing head gasket or a cracked block. But like I said it's definitely a rotten egg sulfuric smell.
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MLanders86
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Report this Post06-02-2014 12:14 PM Click Here to See the Profile for MLanders86Click Here to Email MLanders86Send a Private Message to MLanders86Edit/Delete MessageReply w/QuoteDirect Link to This Post

MLanders86

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It's a 6 cylinder btw. 2.8l
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Report this Post06-02-2014 12:45 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
rotten egg smell is not coolant.....it's probably converter...

fix the exhaust manifold, because the converter may not be getting up to temperature and collecting moisture.
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Report this Post06-02-2014 01:25 PM Click Here to See the Profile for dobeySend a Private Message to dobeyEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by MLanders86:
But like I said it's definitely a rotten egg sulfuric smell.


Definitely the catalytic converter. Get a new one.

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Report this Post06-02-2014 01:56 PM Click Here to See the Profile for 2.5Send a Private Message to 2.5Edit/Delete MessageReply w/QuoteDirect Link to This Post
How does a cat cause smoke though?
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dobey
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Report this Post06-02-2014 03:10 PM Click Here to See the Profile for dobeySend a Private Message to dobeyEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by 2.5:

How does a cat cause smoke though?


It doesn't. It causes the smell. The white "smoke" is just condensation in the exhaust burning off at cold start. Or there is some coolant or water getting into the cylinders or exhaust. Could need a head gasket too, and if the cat isn't replaced soon, could get much worse. A small enough break in the gasket could be getting sealed up after the engine warms up, due to material expansion. I've had exhaust leaks in the past that do the same. Though if there was a gasket issue, I'd expect to see the coolant level go down in the overflow (or air bubbles). But if it's small enough, the loss might not be noticeably large enough, and it could take a long time for one to realize it's leaking coolant into the engine.

But sulfuric smell is definitely the cat.
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