Renault Laguna slow accelatration,and whining noise,and some grey smoke

2004 Renault Laguna Problem

CarRenault Laguna 1.9 deisel
Ownerkevin crook
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only happens when slowing down and pulling off,and has only happened today(21/6/12)
then when turned off made whining/squawking noise as if a alarm trying to go off,sounds very sorry for its self,then smoke comes from under car,then once car gets going the noise stops,but as building speed a slight whining noise,until reach approx 40

any thoughts on this as don't sound good,thx
Problem Category
Electrics, ECU, Warnings & Lights

Leaks & Noises, Interior and Bodywork

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