car prob any idears...

[horsham rc]

hi all hope i can get some help
i have a 02 [URL="http://volvoforums.com/forum/showthread.php?t=51191#"][COLOR=darkgreen]s80[/COLOR][/URL] d5 and on start up its fine no smoke and in park if i hard throtel down still no smoke but if in d and drive it will below out smoke to the point that drivers behind will stop.
i thrashed it down the road the uther night and it seames to clear if you thrash it but on slow town driving its to bad to drive... any info please. would a blown intercooler cause this?
there is some wet oil around the top of the cooler and the top pipe has carbon build up the bottom is alittle wet with oil.no oil in air box..
lots of soot left [URL="http://volvoforums.com/forum/showthread.php?t=51191#"][COLOR=darkgreen]on[/COLOR][COLOR=darkgreen] [/COLOR][COLOR=darkgreen]the[/COLOR][COLOR=darkgreen] [/COLOR][COLOR=darkgreen]road[/COLOR][/URL] also when hard throttle is aplied but the soot dose clear after a thrash.....

[3d_willz]

sounds like turbo has gone

[jamiem]

If the turbo was "gone", there would be very little power and the smoke would be thick blue, not black. Black suggests massive over-fuelling, probably from a split intercooler/pipe or vacuum line. You need to get it on a diagnostic machine and up on a ramp for a decent mechanic to have a nose over.

[horsham rc]

Turbo..... see now on a petrol car i would no if the turbo has blown as it will blow blue ish smoke on aceleratoion and use oil and have lots of iol in the intercooler ... but on a diesle i have no ider. if it was turbo wouldnt there be wet oil in the boost pipe? witch ther is not!

[higgsy09]

Air filter maybe blocked???

Black smoke is unburnt diesel, if filter is blocked there is no air to make it burn

[3d_willz]

if it was the turbo then you would also get oil residue in the exhaust but if it is black smoke then it could also be an injector which would be the more likely cause not an airleak

[Mart61]

I had exactly the same issue once a few years ago with a Mercedes diesel. It wasn't every time i hit the gas hard, just every once in a while. I was told by the Merc main dealer I used that it was just the way it was. They almost implied that it was the engine blowing out the cobwebs every once in a while and I shouldn't worry about it.

[higgsy09]

could be a sticky injector, not so common now with the latest setups, and would do it probably from startup as well

[horsham rc]

[QUOTE=Mart61;626274]I had exactly the same issue once a few years ago with a Mercedes diesel. It wasn't every time i hit the gas hard, just every once in a while. I was told by the Merc main dealer I used that it was just the way it was. They almost implied that it was the engine blowing out the cobwebs every once in a while and I shouldn't worry about it.[/QUOTE]

defo not cobwebs... and its everytime you drive more so under 40mph as said when thrashed it all most clears completly.

[challis349]

Could it be the flux capacitor, I would look at that first, see if you can source a new one ;)

[higgsy09]

do you know if you have an EGR valve fitted (exhaust gas recirculation valve)? these used to be a problem a while back

[horsham rc]

[QUOTE=higgsy09;626293]do you know if you have an EGR valve fitted (exhaust gas recirculation valve)? these used to be a problem a while back[/QUOTE]

will find out

[simplyraptor]

Only two things i can think of -

Check the intercooler/turbo pipes for any splits or there is a possibility one of the injectors is not closing properly and is weeping constantly which would clear when you accelerate on an open road but would not clear when driving through town at 30mph.

[pgvibesg]

engine breathers, egr valve and also air mass meter can cause this problem if intercooler has blown you would hear a rush of air when revving or when the turbo starts to come in more likely to here it when driving as well as lack of power needs to be put on a diagnostics machine.

[Eckchaz]

Blown turbos on Diesels will have a shite load off white smoke.. so I dont think its that..

My monies on a clogged EGR valve (easy take out and clean route)..

or the more costly route.. your butterfly valves might be f*cked or sticking..

and do you have a Particulate filter (for exhaust gases that is) on the car? and does the car feel underpowered.. Diesel cars always get clogged up and do need the occasional foot to floor in second gear to clear the system.. or get something like Millers Diesel power/Redex to help.. but not wynns etc as they are poo poo! :)