smoking cossy please help!
Hi i have a j reg 4x4 sapphire cosworth which has just coverd 114,000 it does have abit of piston slap when cold but nothing to worry about.The engine runs sweet as a nut hardly uses any oil and pulls like a train (stage 3).I have just noticed it smoking quite badly on run down!if i nail it to about 120 130mph and let go of the throttle letting the car slow on its own it smokes,once the speed has dropped to about 80 or 90 if i apply the gas to keep it at this speed it will puff quite abit then instantly clear up.Through the gears its fine just top end on run down? anyone any ideas?