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Hi I have mazda 3 2005 diesel it runs fi...

ASKED 16/01/2017

Question

Hi I have mazda 3 2005 diesel it runs fine but ive noticed when I am above 70mph the car start releasing a white smoke from the exhaust today was quite excessive and felt like the car cough without affecting the speed, I reduced the speed to 60mph and the smoke gone the car runs normal but im concern only happened with the fifth gear.

Answer

This could be a number of things one is injectors

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