V70: Black smoke on heavy right foot

[Pgibb44]

Well its getting to the mot time two months till then but I have black smoke from the exhaust and heavy right foot but clears after a few seconds then when I give it another boot same thing . I have on warnings on or massage showing runs fine average mpg of 39.2 mpg around town . Been told it could be injectors or a vac leak . 2002 v70 d5 is what I have still a good car so just hope it will pass

[Cookeh]

Black smoke suggests fueling issue (overfueling, typically). That being said, this section of the forum is for pre-2000 V70s, and the 2000-2007 cars like yours are a completely different kettle of fish.

Try asking the same question in the P2 V70 section - click me.

[cyclogenesis]

Check your induction system for leaks. The ECU will be fueling the vehicle on the basis of a measured amount of air. If some of that air escapes then you will be running rich and fuel will be unburnt as there is not enough oxygen for full combustion.

[brutusmotorsport]

most definatly boost leak. I had the same issues. now sorted, no smoke. and yes with a leak you do get loads .

[NI_Volvo_Nut]

Take it for a run, hard accelration whenever possible, its probably clogged with soot from not being driven hard, 2 or 3 traffic light grand prix should sort it!

[Watchnut]

mine smokes a wee bit on a heavy right foot, and to pass an mot I take it once warmed up to the morway and let rip in 3rd to the red line.....it smokes like dastardly and muttley
I stay at red line to next morway exit in 3rd, then straight to mot with a red hot decoked engine....passes smoke test every time

on a side note our hose from the turbo we later found had a small slit in it causing the engine management light to come on now and again. Since this has been replaced we have bags of power and far less smoke

[tdidave]

I can't speak for those with petrol cars, but my 1998 V70 Tdi belches a bit when I boot it. Soon clears though, and then its fine. I put this down to sedate driving most of the time, carbon building, and maybe a bit of residual oil build up in the turbo which quickly gets burnt up accelerating hard.

Dave..

[Paul240480]

Not really helpful, but I used to drive BMW 325TDI and 330TDI’s in anger in the fuzz. They both left clouds of black smoke after pootling about then getting a ‘shout’. The 325’s were worse. So maybe a common thing for oil burners ? I’ve always had petrol cars....