Black smoke from my Peugeot diesel

Did you change the fuel filter?

--=20 Conor

I'm really a nice guy. If I had friends, they would tell you.

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Did you change the fuel filter?

faulty jet on one of the injectors. engine needs a decoke.

over the years the inside of the cylinders and head/ ie the combustion chamber/ gets covered in carbon/soot. this can alter the combustion of the fuel/air mixture so that it will not burn cleanly. also some of the diesel can be soaked up thus not allowing all of the diesel to burn quick enough. because of this the engine can start to give out black smoke.

unfortionally the only way to clean the carbon out is to take off the head and manually clean off the carbon..

It is, you buy the golden decaf-cola, and use that. It's what um-bongo was referring to, in a juicey-carton sort of way.

Actually you can clean it off with water, the cylinder that's blown to the water jackets always obvious. You can buy expensive aerosols that are basically water & propellant.

Is it a turbo or normally aspirated? For either, a previous owner may have turned up the minimum fuelling screw on the fuel pump. If turbo, they may also have lengthened the wastegate arm and increased the on-boost fuelling. This kind of mod is very common to increase performance. Check to see if the factory seals are still on the screws on the pump.

Join pug306.net and maybe 306gti6.com forums. Often frequented by a load of boy racers of course but some people there do know their stuff.

I would've thought a leaking injector would cause an odd sounding idle as fuel drips from the nozzle.

Check other usual things too, like blocked breather hoses, intercooler, and the flame trap.

I don't know your driving habits, but keep from revving over 2500rpm until the engine is warm, avoid idling for long periods, and to clear any crap out next time you're on the motorway accelerate hard and keep it in 4th for a few miles, but there's no point going over 4200rpm.

Hope to help, Paul

Provided you know your cambelt is sound you could always try an Italian decoke:

Find a nice quiet road and floor the car in 2nd for 30 seconds or more at full revs i.e. on the rev limiter. That'll chuck a load of crud out the exhaust and decoke your engine quite a bit.

On my 307 HDI i can do something similar... run the car at 4K constantly in

3rd (70Mph) for 20 mins to engage a cleaning procedure in the ECU to clear out the particulate filer in the exhaust system.

Chris

I've revved it really hard while stationery and the whole road was blacked out. There was a big, sooty mark left on the road as well. Is there a reason why it's better to do this in 2nd gear and not floor it while it's standing still?

Chris Dugan wrote:

In addition you'll have some air flowing past the rad and exhaust helping to cool it, flat out in 3rd is probably about 80 in most diesels so don't do that unless you are on a motorway. Plus, whatever road you choose, if a plod sees you doing this they'll have a word about getting your car serviced and all the smoke obscuring the view of the drivers behind you.

Chris

We were somewhere around Barstow, on the edge of the desert, when the drugs began to take hold. I remember "Duncan Wood" saying something like:

Yep. I've seen the effect of water injection on combustion chambers - clean as a whistle. Which makes me think about rigging up a temp water injection assembly for occasional decoking use.

Pint glass, piece of servo hose & a clamp, as you open the clamp the vacuum sucks the water up.