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Hi,

Hope someone can help or at least advise.

Just bought a Grand Espace 2.2 dci Expression - with no dealer warranty.

The car lacks power at low revs and has black smoke. As soon as the revs build it feels as if the turbo kicks in, solves the problem and off it goes.

Many Thanks in advance......
 

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black smoke is normally a sign that fuel is not being burnt fully in the engine, and the most likely cause of that is insufficient clean air getting into the cylinder.

Make sure that the air filter is in good condition and is clean. If in any doubt replace it.

Check the air flow meter, which will be attached to the air hose between the filter and the turbo, disconnect the power cables from it and see if that makes any difference.

The turbo itself is vacuum controlled, find the thin vacuum control pipe and make sure it is properly attached and that it has no splits or cracks.

Check that the air hoses from the turbo to the engine (including the intercooler if fitted) are good, again no cracks or splits, no missing clips etc.

finally check the exhaust gas recirculation valve is working properly. they often get choked up with carbon deposits and can stick open, causing dirty exhaust gas to flow back into the engine when it shouldn't, especially at low revs and with a cold engine.

These checks will solve 9 out of 10 black smoke issues. If they don't then the next things to look at are failed turbo, injection pump or injectors however before investigating any of that I would suggest having a proper diagnostic run by Renault.
 
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The 2.2 Dci engine has a history of cracking inlet manifolds and failing inlet manifold gaskets which cause the symptoms you describe. It would do no harm to check these apsects if only to eliminate them as possibilities.:)
 
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