Every morning on the first start up of my Mitsubishi L300 there is lot of blue smoke and the van rough idles for a couple of minutes. After engine heats up , it works fine. But whenever engine is cold (like 25 Celsius) engine is not stable. Also there is no starting problem and Fuel economy also good.
What may be the reason for this.
Please help me.
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Few days ago, I went to Mitsubishi Service Centre, and told them about my problem.
Then they cleaned injectors and re corrected the valve tappet clearance and told me problem is fixed.
But today I noticed that, problem still remains. Also I forgot to tell you that a black liquid comes out(a little) from exhaust pipe(seems to be water, not sure). It remains also.
what kind of a problem that can be.


P.S: It has a Diesel engine