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Hi, we have a 2010 Tiguan TDI with a misfire issue, it has been into our usual garage to be looked at yesterday, however, the only fault found was a misfire, they did check the injectors, swapped them around however, this changed nothing, as they dont fix electrical and are not a VW specialist, we have now booked into another garage for Monday. The car is juddering, misfiring both at idel and when on the move, it is now smelling of fuel when following behind and on occassion smoking? any ideas what it might be and likely repair costs... Up to now we have never had any issues, worried about what it will cost to repair and if it will then be back to being OK after. thank you.
 

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A few things for the new mechanic to look at is the HPFP (high pressure fuel pump) they have been know to fail and send shrapnel back into to fuel system requiring a full system flush and parts replacement. Have the mechanic pull the fuel filter and look for bits of metal if this is the case the vehicle needs parked immediately till the system be flushed including injectors, tank, lines etc.
 
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