Question about 1991 GMC Suburban

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Smoking My suburban is smoking. Its a blue-ish gray smoke. my friend whose a mechanic looked at it and said it smells just like exhuast fumes and not oil burning. what do i do to fix this?

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I question the thinking of your mehcanic, the exhaust has odorless cumulatively POISIONOUS Carbon monoxide, smell testing went out in the 50s.

The questions are: is it consuming oil, is it running rich, any error codes? How is fuel mileage? What are the exhaust readings? The answers to these dicate the next step.

Posted on Jul 14, 2010

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Posted on Jan 02, 2017

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I would like to know what makes that the Jeep smoke after rearranging the vacuum lines is it the EVAP system on HBO or the engine vacuum lines vacuum lines


the book is free,
and real
and posted here over 300 times, search much.
all that is covered in the SM. (how to put it back as it was new)

no clues as to what the smoke is.
or where it emits from. (tail pipe end)
white smoke or black
black is rich running.
white can be burning oil and smells like burning oil (lingers)
white can be steam,aka, antifeezes burning, goes the vapors dont linger like oil smoke does and smells sweet, unlike oil smoke.

EVAP is only FUEL vent , fumes. gas fumes.
there are lots of vacuum lines
to engine
evap
brake booster
the engine hood sticker covers the majors, (smog related, )

SM , serv. man. click WK and read.

free
http://www.morris4x4center.com/knowledge-base/index.htm?utm_source=cj#service

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Suzuki 12valve smokey engine?


Could be valve stem oil seals, could be piston rings worn, could even just need a tune, best advice without seeing the car run is to go to your local mechanic with the car for their opinion

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I'm looking to purchase a used car. I've been doing online research and saw this webpage http://www.usedcarsmells.com . They talk about exhaust color and smells. Is it true that you could tell a lot about...


Yes this is correct, you can get important information from the colour of smoke from the exhaust:

Blue/Gray Smoke: Blue/gray exhaust smoke is an indication of oil burning in the combustion chamber. These are possible symptoms and causes:
Valve Seals: Leaking valve seals will cause blue/gray smoke at startup because oil leaks past the seals into the cylinder after the engine shuts down.
Valve Guides: Excessive clearance between the valve stem and the valve guide allows oil to leak past the gap into the cylinder.
Piston Rings: Worn or damaged piston rings will cause blow-by resulting in blue/gray smoke.
Worn Cylinder Walls: Worn cylinder walls cause blow-by resulting in blue/gray smoke.
PCV System: A stuck closed PCV valve will cause excessive crankcase pressure resulting in blue/gray smoke.
Black Smoke: Black exhaust smoke is an indication of a rich fuel condition. These are possible causes:
Fuel Injectors: A leaking or dripping fuel injector will cause a rich fuel condition.
Fuel Pressure Regulator: A stuck closed fuel pressure regulator will cause a rich fuel condition.
Fuel Return: A restricted fuel return line will cause a rich fuel condition.
White/Gray Smoke: White exhaust smoke is an indication that coolant is burning in the combustion chamber. These are possible causes:
Cylinder Head: A crack in the cylinder head (around the coolant jacket) will cause coolant to enter the combustion chamber.
Engine Block: A crack in the deck of an engine block near the coolant jacket will cause coolant to enter the combustion chamber.
Head Gasket: A damaged or blown head gasket will cause coolant to enter the combustion chamber resulting in white/gray smoke coming from the tailpipe.

Jan 17, 2015 | Cars & Trucks

1 Answer

Engine concern


Smoke (blue or black) or steam (white)? White smoke is really steam that is caused by water leaking onto hot surface. Could be leaking from hose running to heater coil under dash, or something else. Check radiator water level to make sure water level is ok. Blue smoke is oil burning. This could be dangerous, caused by similar scenario of oil leaking on a hot surface (from a gasket leak, etc), or exhaust fumes. Black smoke means something is actually burning and could indicate fire. Black or blue some could fill vehicle cabin with toxic fumes, even if you don't smell anything bad.

Jan 02, 2014 | 1995 Isuzu Trooper

1 Answer

Car is smoking when driving don't know what it is


Black smoke: Black smoke is often a result of too much fuel and not enough air in the combustion chamber. In rare cases, it can be weak fuel pressure causing fuel to 'drip' from injectors rather than 'spray'. It can also be caused by weak fire in the combustion chamber.

Gray smoke:
Gray smoke is caused by brake fluid. It generally means that your brake master cylinder is bad, and is getting sucked through the vacuum brake hose.

Blue smoke:
Blue smoke is generally caused by the burning of an oil in the combustion chamber. Normal causes of oil getting into the combustion chamber are weak piston rings, bad valve guides, bad valve seals, or plugged up engines where oil is sucked back through PCV system,usually due to lack of oil changes

Jan 14, 2013 | Cars & Trucks

1 Answer

Strong fuel smell


Stop driving until you get this figured out, as you are a fire hazard with possible fuel leaking or being pumped somewhere it shouldn't be....Look for wet areas...Be careful about not smoking and electric lights, as fuel fumes are VERY flamable.

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1 Answer

Smelling fumes out the exaust tail pipe


would you please describe the fumes like raw gas fumes oil smell smells rich etc and color of the exhuast fume and if real smokey extra smoke

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My 2002 montero was smoking really bad (white smoke) it smelled like burning plastic. I took it home and let it sit for 1/2 hour. I started it and the smoke faded away, but when i accelerate to take off it...


HAVE YOU NOTICED COOLANT LOSS,RECENTLY?KEEP THE COOLANT LEVELS FULL,CHECK TO SEE FOR ANY LOSS AT ALL! OIL SMOKE IS MORE BLUE THAN WHITE,BUT FUEL CAN HAVE A LIGHT BLUE SMOKE.Antifreez more whitesh with a similar smell of antifreeze.

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1 Answer

Smoke and smell of a "burning clutch" when the


ask a mechanic to have a look because without seeing it ,i couldnt really say

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1 Answer

Constant smoke from tail pipe.


If its smoking that bad you should be able to tell if its oil or antifreeze by the smell, stand behind the car as its running, if its white and you smell a sweet smell its antifreeze if its blue and smells like a oil refinery its oil.

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