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Message: <blockquote data-quote="r37720" data-source="post: 248990" data-attributes="member: 906"><p>I think most of the mechanics knows that the black smoke is caused by in-effective burning (fuel riched mixture). That is why they said that the breather valve is stucked that during high acceleration in whcih valve cannot breath and cause the fuel riched. The same goes to high pressure pump that the pressure is out of spec, on higher side,  that delivered a lot of fuel to the combustion chamber. While the theory of AFM is that the sensor can't accurately read the right amount of air to be sucked into the inlet manifold. This is like doing the FMEA (failure Mode and Effect Analysis) and they all are potential problem. However they never though of simple problem that the air cleaner mounting rubber has blocked the air flowing to the AFM. This is the first step they have to check as one of our member had mentioned.</p></blockquote><p></p>