Question about 1999 Mazda 626

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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?

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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.

Posted on Oct 09, 2010

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I have a '98 Niss Frontier XE.Lt gray smoke comes out of exhaust,trans slips in 3rd gear, cant pass 35mph w/out turning O/D off. chk eng light is on.can I check for the prob w/out taking it to shop?


White or light gray smoke could be an indication the head gasket is leaking or even blown. The motor will also run hot and you lose cooling fluid. I would not use the car for any other ride then straight to the repair shop.

Apr 16, 2015 | 1998 Nissan Frontier

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

1 Answer

My Mazda 1997 626 is smoking when driven. Just had exhaust and transmisson work. Mechanics say it's fine


its time to look under the car yourself for a oil leak or even a plastic bag burning on the exhaust you have been checking the engine oil have you checked the transmission fluid level? the trans is on the drivers side i believe

Jul 11, 2012 | 1997 Mazda 626

1 Answer

My 1990 mazda 626 has white smoke comming out of tail pipe


could be water vapor from a bad head gasket or emissions sytem malfunction.

Feb 20, 2010 | 1990 Mazda 626

1 Answer

White smoke on start up on 1998 mazda 626


Hi
Lots of things to check
?Leaking head gasket
Does it use brake fluid
Start engine only fo a few seconds, shut down, remove all spark plugs to see which ones are fouled

Aug 10, 2009 | 1999 Mazda 626

3 Answers

Theres was smoke coming from the exhaust and engine


if you have white smoke in your exhaust, you have a blown headgasket, and if you 626 is turbo'd and depending to the tubo is cooled eg antireeze, then coolant could be leaking out that way too. also it would be helpfull to know what the steam is coming from. BUT since you mentioned that is coming from the exhaust, it woud wager that its a blown head gasket. you can veryfi this a number of way. take out your spark plugs one at a time and have a look at them. if a couple look "too clean" or seam to "steam cleaned" compared to the other ones = lack carbon build up etc, then the plug that you took out is the cylinder where the engine coolant is leaking into. also, you can do a compression test = which ever cyclinders are super low = blown gasket is located on that cylinder. PS if you do have a blown head gasket, you should replace your oxygen sensor as well because the glycol in the antifreeze wrecks the O2 sensor.

Jul 07, 2009 | 1999 Mazda 626

1 Answer

White, blue smoke from exhaust


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

Jan 20, 2009 | 1998 Mazda 626

2 Answers

My 1991 mazda 626 runs great but will not stop burning oil and white smoke keeps coming out of the exuast pipe


Hi Arelis,

It sounds like two different problems. White smoke is indicative of water in the fuel. If it was oil burning the smoke would be blue.

The oil may be leaking out. Is there evidence of oil leakage on the road when you park? Check the engine for for oil leaks.

There are additives available at auto parts stores that deal with water in the fuel supply.

Please feel free to contact me. More details will be needed to get to the source of the oil problem

Mike

Jul 24, 2008 | 2001 Mazda 626

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