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1984 Mazda Rx6 (FI) - Gray smoke from exhaust

As soon as the car starts massive amounts of gray smoke come from the exhaust. Removing the plugs, they are wet with fuel. I am guessing Fuel Injector(s) leaking, but want to know what else to check. I doubt the engine seals are defective, but am also waiting on a compression tester just in case. Any other ideas?

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IF it has injectors that would be the problem but check to make sure if is not carburated if it is probably bad float

Posted on Sep 23, 2009

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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

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99 Grand Am Smoke Exhaust


I'm sorry to say your engine may be cooked.
Since you are adding both oil and coolant, and the color of the smoke is gray or white, you have the signs of the engine burning coolant.
The common cause is a leaking head gasket.

Dec 17, 2012 | 1999 Pontiac Grand Am GT

1 Answer

I have a 98 mazda 626 only when its cold i have like a blue gray or even white smoke coming from the exhaust don't know what it could be?


Your exhaust valves have deposits on them that don't allow for a good seal when the engine is cold, or your piston rings are worn, allowing oil to get past when the engine is cold. In either case the seals improve as the engine warms, making the smoke go away. You can try to see if an oil additive will improve your situation.

Oct 09, 2010 | 1999 Mazda 626

2 Answers

Blue smokes come out tailpipe when i start the car but stops afte


Helllo there
Symptom: Gray or blue smoke from the exhaust. You notice gray smoke coming from the exhaust when you start your car. The smoke may or may not disappear after the car is warmed. If it is, it is less noticeable. The smoke may have a bluish tint to it. Possible causes:

  1. The engine's piston rings may be worn.
    The Fix: Replace piston rings. (Generally not a DIY job)
  2. The engine's valve seals may be worn.
    The Fix: Replace valve seals. (Generally not a DIY job)
  3. Damaged or worn valve guides.
    The Fix: Replace valve guides. (Not a DIY job)
Symptom: Engine uses more oil than normal, and there is some smoke from the exhaust. The oil level is low between oil changes. It appears that the oil is being burned by the engine because of the smoke in the exhaust. You may or may not notice the engine doesn't have the same power as it used to.
Possible causes:

  1. The PCV system is not working properly.
    The Fix: Replace PCV valve.
  2. The engine may have mechanical problems.
    The Fix: Check compression to determine engine condition.
  3. The engine's piston rings may be worn.
    The Fix: Replace piston rings. (Generally not a DIY job)
  4. The engine's valve seals may be worn.
    The Fix: Replace valve seals. (Generally not a DIY job)

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Today I bought a 2nd hand Mazda 6 with 70K KM's. I drove it out of the dealership and put $35 worth of Shell Optimax fuel in the tanks. 20 minutes drive down the road, the car starts spewing out large...


not sure the gas had much to do with it. sounds like a blown head gasket. what is the colour of the oil. gray often indicates fluids have leaked into it. white smoke out the tailpipe generally indicates a blown head gasket as well.

Nov 22, 2009 | 2006 Mazda 6

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White smoke coming from exhaust when accelerating


Is the white smoke steam or water? If so it is a blown head-gasket. Fix ASAP or you will ruin the engine. Or is exhaust blueish/gray or gray and smells like gas or oil. If this is the case then it could be a fuel injector, spark-plug (or no spark to plug), valve seals, piston ring/s, or clogged air filter.

Jun 20, 2009 | 1996 Toyota Camry

1 Answer

Gray smoke & lost of power


The engine gray smoke is from excessive fuel burning to give the engine power. I am assuming the vehcle is an automatic transmission. Sound like I would have the transmission check for a lock up torque convetor. The transmission maybe taking off in second gear and starting out in a fail safe mode. I suggest taking to the dealer or tranmission shop.

Jan 26, 2009 | 2005 Audi A4

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Gray smoke from exhaust from 6.0 diesel


From my experience gray or white smoke means a blown head gasket. Check the oil and see if there is any water in it. You can also check radiator and see if there is any oil in it too. Hope this helps

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1 Answer

Gray smoke


i have a vauxhall combo 2003 deisel excessive smoke and lack of power can you help

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