Question about 2000 Hyundai Elantra

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Car has exhaust leak that smells terrible and comes through the ac....and exhaust blows out black specks everywhere...what could be causing the leak?

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  • rebel_linema Oct 21, 2009

    yea the lights been on. it started the same time someone poured wat looked like oil in my brothers new 700 grizzly i think they put someone in my car to.



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Cracked manifold, loose pipe or bad gasket. If it smells bad you might have a bad oxygen sensor. Is the check engine light on?

Posted on Sep 24, 2009

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Stopped up Catalytic converter. You need a muffler shop or remove it yourself if its bolted on.

Posted on Sep 24, 2009


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I'm looking to purchase a used car. I've been doing online research and saw this webpage . 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

I have a burnt freon smell coming inside the car while AC is on. How do I find out where the leak is and is it toxic

check if there is a oil or coolant leak dropping on the exhaust system and the fumes being sucked in by the AC fan . If there is a AC gas leak the air conditioner will soon only blow hot air.

Oct 29, 2014 | Cars & Trucks

1 Answer

Can you tell me why my truck smells antifreezy when I started

Is the heater or ac fan on....? Where is the smell coming from?

my thought are if smell coming from exhaust, you have a head gasket problem.

If smell coming from AC or heater, likely a heater core leaking!

Aug 12, 2014 | 2001 Dodge Ram 1500 Truck 2WD

1 Answer

Burning smell in 97 grand prix

I suspect these problems are unrelated.

Braking shake is usually caused by warped rotors or drums. A brake shop can machine or replace these.

A burning smell is most commonly caused when a drip from an oil leak hits the hot exhaust system. It does not need much to smell terrible. You will see brown or black stains on the exhaust somewhere.

Nov 22, 2013 | Pontiac Cars & Trucks

1 Answer

Fuel smell in my 2005 Ford 500 when the AC is on

How does the engine perform compared to
when it was new?

Do you see any thing leaking on the motor?

Is the MIL Lamp on the dash lite or codes stored,
check lamp or not?

Is the smell only on A/C not Heat Mode?

Have you changed the front or upstream oxygen
sensors at 100,000 miles

Check the fuel pressure regulator on or near
the end of fuel rail for leaking

Nov 22, 2012 | Cars & Trucks

1 Answer

Exhaust fumes entering when ac on

Could be a leaking exhaust manifold or pipe gasket.

Sep 28, 2012 | 2004 Oldsmobile Alero

2 Answers

I have a Maxima and am getting black smoke. Is it

put ur ac on recycling air if it stops check ur exhaust pipe

Oct 15, 2009 | 1995 Nissan Maxima

3 Answers

Burnt Oil Smell

Check carefully around the valve covers, this is the area that leaks most frequently occur, and being located next to the exhaust manifold can easily cause the burning smell. There is a very easy to replace gasket under the cover. Other possibilities, shop or you when changed or added oil spilled a bit and that has worked down to the exhaust manifold and is causing the burnt oil smell. Last possibility is that you do have a slow leak on the underside of the engine that is blowing back onto the exhaust system causing the smell.

May 22, 2009 | 1998 Oldsmobile Intrigue

1 Answer

White smoke exhaust

White smoke is caused by coolant or water coming out the tail pipe. There is a chance that the white smoke was caused by water splashing up from a puddle onto the exhaust pipe. Keep an eye on the coolant level in the radiator in any event. If its less then there leak coolant leak in the car engine which is causing this problem....

Oct 18, 2008 | 1988 Isuzu Impulse

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