Question about Mazda MAZDA6

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Hi I recently bought Mazda 6 diesel. In slow running it's engine generate knocking sound and after couple of seconds it exhausts bulk of white smoke, after high acceleration this smoke disappears. Can you please help me to solve the problem? Thanks

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Sounds like the head gasket as gone

Posted on Oct 16, 2012

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  • 39 Answers

Chek your water in the radiator if is not on normal it is under then is the head gasket

Posted on Nov 15, 2010

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Mazda drifter b2500 WL engine has knocking sound misfiring and white smoke after cylinder head was replaced.please help


I could be wrong but white smoke usually oil and black smoke is usually gas. If that is correct and you changed the head you may have a leak from the head gasket, or it is not torqued correctly. Your valves may not be adjusted correctly. The timing could also be off. Just some of my thoughts. Sorry I can not be for sure.

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Engine knock 02 Jeep Liberty 3.7, its not the rockers.


Could be a bearing. If so could be expensive. If its a straight 6 could be a host of things, head crack that has over heated engine makes it sound like a diesel, bad lifter, you need a mechanic to look before real damage is done

Mar 29, 2014 | 2002 Jeep Liberty

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My hyundai starex diesel 2.5L CRDi exhausts white smoke and poor acceleration after I cleaned injectors and replaced the fuel filter ... Need help please


The white smoke would indicate a blown head gasket. If water is getting into the engine it could cause that knocking noise. The other issue with the knocking could be as serious as a rod through the engine block.

Apr 23, 2013 | Cars & Trucks

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Audi 2.5tdi white smoke on exhaust low revs


Hi
White smoke is usually a good sign of un-burnt diesel so reading your post and all the things you have already changed ie the glow plugs I would have the injectors tested to make sure they are atomising properly as it sounds to me like when your car isn't under load ie at low revs you have a cylinder that isn't firing correctly
Hope this helps Nick

Aug 27, 2017 | Cars & Trucks

1 Answer

Ford focus tdci not starting and white smoke coming out of the exhaust


It is a clear case of the glow plugs malfunction. It had happened with my neighbor who tried to start his diesel focus one day.
Even jump starting with another battery didn't solve the starting problem.

You could also check the EGR valve for damages and if you want to save a couple of bucks, then go in for used parts for the focus from Good used Focus Stuff

Mar 29, 2013 | 2001 Ford Focus

2 Answers

My mazda 626 has a strong potent smell coming from the exhaust


You don't mention what that smell is reminiscent of?

You don't mention the colour of the "smoke" and you didn't say whether the engine is petrol or diesel?

You don't mention whether the road behaviour/performance is normal?

White smoke is almost always steam or in the case of a diesel it could be an unburned fuel mist, grey/black is excess fuel and blue or grey/blue is burning oil.

Some steam is fairly normal until the engine and exhaust system is hot but excessive amounts could be one symptom of head gasket trouble. If the engine is drinking coolant and sending it through the exhaust as steam it will sometimes smell spicy.

Burning oil smells a bit like burned eggs in the frying pan.

If the car hasn't ultra-low sulphur oil and fuel the catalytic converter will convert sulphur traces into hydrogen sulphide - the bad egg gas...

Sep 27, 2017 | 1998 Mazda 626

1 Answer

Mazda 6 1.8 ts 05 constant blue white smoke out of exhaust


It probably has some internal engine damage. If you pull the spark plugs one or more will probably be oil fouled.
You may want to have a compression test done and see if you can find the source of the oil - may be a head gasket.

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Single cylinder yanmar diesel engine on log splitter back fires out of exhuast & blows out black smoke


Engines runs for a couple of seconds then loudly backfires with a flash of flame out of the exhaust followed by a plume of black smoke. Then runs sort of ok for a couple of seconds then repeats the backfire again AmanStino Lightning Cable Apple MFi Certified 1M Nylon Braided Charging...

Apr 21, 2012 | Cars & Trucks

1 Answer

Have Mazda bravo B2600 4WD ,has white smoke & oil from exhaust. Running rough as if on 3 cylinder


You dont say weather its a petrol or diesel engine as there a slight differance in the answer and if a turbo on a diesel thats even more of a differance, but taking it a petrol .
Well to start with the white smoke Isent smoke its water and after going through the engine it turns into Steam and thats what you see..
Running on 3 clyinders is caused through 1 cylinder isent working as a engine should and has a bad valve or a broken piston ring or more and even a cracked head and gasket letting the water through,,,also the broken ring works like a oil pump as if not firing given you power then it works like a oil pump and pumps it into the cylinder that dosent work only pumping oil into the hot exhaust system while running.CAUSING SMOKE
And if a turbo then could be the turbo bearings worn and pushing oil into the engine and still doing the same as before.
Let me know how you get on. RON

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1 Answer

White smoke from Exhaust


hardly likely the exhaust job would cause that, but yes it sounds like you got a blown head gasket. badl lock stricks hmm! also preasure test cylinder head for leaks

Jul 22, 2009 | 2005 Renault R5

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