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Megane diesel 1.5 starts but clouds of black smoke

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Posted on Jan 02, 2017

TLRogue
  • 99 Answers

SOURCE: renault megane diesel black smoke

This could be as simple as the EGR (exhaust gas recycling) valve stuck open. This valve is supposed to open at a specific time, recycling the exhaust gasses back through the engine. If they stick open, the engine is not getting the correct air mixture to burn the fuel efficently, causing black smoke and lack of power. Have the garage remove and blank off this valve. If it runs ok, then a new EGR is needed.

TL

Posted on Jan 24, 2009

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I would not be too worried if it is only when you first start it up.

Diesel smells like oil at the best of times especially when it gets on your hands :) I have an old diesel engine (280,000 km never had the head off ) with no fancy turbo or anything on it. It used to blow a cloud of black smoke when I started it in winter time. It used to crank more before it started when it was cold too. The problem turned out to be 5 out of 6 of my glow plugs were broken. So it was just squirting more and more diesel into the cylinder before it generated enough heat to start. When it finally kicked all the fuel burnt at once hence the black smoke. There is a way to test your glow plugs (assuming you engine has them) with a multi meter. Or just get a mechanic to check and replace them as needed. Mine were about as complicated as changing a spark plug.

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This could be as simple as the EGR (exhaust gas recycling) valve stuck open. This valve is supposed to open at a specific time, recycling the exhaust gasses back through the engine. If they stick open, the engine is not getting the correct air mixture to burn the fuel efficently, causing black smoke and lack of power. Have the garage remove and blank off this valve. If it runs ok, then a new EGR is needed.

TL

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