Question about 1998 Mazda 626

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White, blue smoke from exhaust

Timing belt sensor failed.Got head cleaned etc,new valves, timing belt and timing belt sensor replaced.This is when burning white smoke started coming from exhaust.Car runs fine apart from this.Help as this is just money money money !!!!!!

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Sorry to spoil your day but white exhaust indicates that you have a blown head gasket or the head and/or the block is cracked

Posted on Mar 11, 2009

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Posted on Jan 02, 2017

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I have a 1995 GMC sierra truck smoke when it stop at red light.


It probably smokes all the time , when moving you don't notice it > What color smoke ? White - coolant is getting in to the combustion camber , head gasket , intake manifold . Blue - oil is being burnt - rings , valve seals , Black - running rich , leaking fuel injectors . leaking fuel pressure regulator . Smokes from were , exhaust ? Engine bay etc....

May 01, 2016 | 1995 GMC Sierra C1500

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2005 Nissan Path:replaced batt, alt, plugs, coils due to rough run & smoke. 1st smoke was blue after new parts it's more gray or white. New plugs smell like fuel. Exhaust is rich in fuel smell. Ideas?


Blue/grey smoke is typically engine oil burning.

Grey/black smoke is typically excess fuel (or insufficient air).

White smoke is invariably water that has turned to steam. (water is a natural product of combustion as well as the stuff the head gasket keeps out of the cylinder).
Sometimes an engine can emit a fine mist of unburned fuel that seems like white smoke.

Clearly your engine is burning some engine oil. Perhaps the valve stem oil seals are failing. When an engine noticably burns oil it must be realised this isn't good for the oxygen sensor and catalytic converter and it is inevitable the life of these things will be shortened.

It is doubtful the replacements you have so far carried out will have changed anything and it is likely to be coincidence the colour of the smoke has changed.

What is needed is a diagnostic check to inspect the live data from the sensors when it will probably be found one or both oxygen sensors will need replacing and perhaps other things have grown tired too - at an extended mileage an injector could start dribbling or the spray patterns be so poor the engine won't be able to burn it all and then it will be expelled into the exhaust.

Apr 26, 2016 | Nissan Cars & Trucks

1 Answer

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

2 Answers

Boniville smokin from exaust changed gaskets whats next


What color is the smoke?Heavy white indicates coolant in the exhaust.Black is excessive fuel.Blue is oil burning.Normal would be a grayish white in color. Let us know.

Jun 12, 2011 | 1998 Pontiac Bonneville

1 Answer

Smoke comeing from exsost


You have a blown headgasket, cracked cylinder head, cracked block only if the color of the smoke is a constant white...requires extensive tests compression etc.
if uits blue in color you have oil passing the rings and out the exhaust valeves on the exhaust stroke, possible collapsed oil rings or valve guide stem seals and knerling ...requirements machinist work.
Momentary cold start white smoke can be normal residual condensation that clears rapidly after start up, blue intial smoke on only the start up after sitting for hours is signs of valve guide wear to be done by a machine shop.

Aug 26, 2010 | 1994 Mercury Grand Marquis

4 Answers

2002 chevelot malbu is smoking help anyone know cars?


YOU NEED TO REPLACE DRIVE BELT BEFORE IT BREAKS. IF CAR SMOKES HEAVY WHITE YOU A HEAD GASKET LEAK.IF CAR SMOKES BLUE SMOKE ALL THE TIME YOU HAVE WORN OUT PISTON RINGS OR VALVE GUIDE AND VALVE SEALS.

Apr 28, 2010 | 2002 Chevrolet Malibu

2 Answers

I have a 1987 suzuki samurai and have white smoke coming from exhaust looked on dipstik and see no signs of antifreeze was told that it could be the timing belt cover leaking that doesent make sense to me...


Are you losing coolant? If so then you could have a cracked head on the exhaust side and it is leaking coolant into the exhaust and being burnt.

Mar 11, 2010 | 1987 Suzuki Samurai

1 Answer

Trouble starting keeps cutting out white smoke from exhaust But when its warmed up its ok


Engine Smoking:
.
Black Engine running rich Possible Failure
-Map sensor, fuel injector or fuel pressure regulator.
Blue -Replace Faulty Transmission modulator valve
White Possible Failure. -Head gasket.
Hope this tip helps.
r/
David

Mar 09, 2010 | 2006 Renault Le Car

3 Answers

What would cause smoke to come out the exhaust pipe


WHITE SMOKE IS BLOWN HEAD GASKET. BLUE SMOKE ENGINE BURNING OIL.DUE TO WORN PISTON RINGS AND WORN VALVE GUIDES.BLACK SMOKE EXCESSIVE RICH MIXTURE.CLOGGED AIR FILTER. FUEL PUMP PRESSURE TOO HIGH.SEVERE MISFIRE.LOW ENGINE COMPRESSION.

Sep 28, 2009 | 1998 Chrysler Sebring

1 Answer

Black smoke on start up


Do a motor flush before the next oil change.
This will free up the rings and regain some of the lose compression.

If it's the org. engine it will has over 90,000 miles on it.

Did you do the 75,000 timing belt change?

It's normal to has the valve stem seal/oil seal on the head to leak oil into the cyclinder.

The smoke you see is the motor oil drop from the seals.

It land on the top of the cyclinders and it create black smoke at start up.

The inexpensive fix is to start using high mileage oil with seal conditioner.
This will help soften the rubber seals and help reduce internal oil leak.

The correct fix is to wait until it's time for a head gasket replacement and let the professional service the head.

Complete head service is the only method to stop this internal oil drip problem.

Nov 22, 2008 | 2000 Chrysler Grand Voyager

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