406 TD Black smoke on acceleration?

Question

Apologies if you've already read this, but i put it in the wrong/different category!

I've recently bought a peugeot 406 TD. It's done 145k, runs perfect, engine sweet as a nut. On start up a puff of smoke (perhaps a little more than you'd expect), but standing, blows fresh air out; even standing while revving up, blows fresh air. Trouble is, when it's in low revs when moving; on or shortly after a gear change, it belches out black smoke. when i accelerate generally, more so when turbo kicking in, lots of black smoke.

i have changed the air, oil and fuel filters, changed oil twice, flushed the oil on the first oil change, added an injector cleaning additive into fuel tank, and still got the problem.

anybody that has had exactly the same problem, or a mechanic/TD specialist, really need your help guys!!

Cheers, Chris.

Answer 1

Black smoke indicates incomplete burning of fuel.

The fuel injectors are probably worn out.
The fuel is coming out in small droplets into the combustion chambers, instead of a fine mist.
Therefore the fuel droplets gather on the top of the piston and do not burn completely.

Another option is low fuel pressure at the injectors.

If fuel pressure is good, I hate to say it,....change your injectors.

Answer 2

Hi chris OK to start with ignore the start up smoke this is normal on 406 TD they have always done it even when new. But your problem sounds like turbo oil seals oil being sucked in under pressure or the EGR valve stuck open easy way to check this is to look at the top of the diesel pump.there should be a thin vacuum hose coming out of it pull this off and drive the car and see if the smoke stops if so its the EGR valve.

Answer 3

White smoke is usually steam, and an indication there is a water leak somewhere. A small amount on start up is not a cause for alarm, it's just the condensation inside the pipes.

Black or blue smoke indicates oil is being burned. Is the oil level also dropping? Could be any one of a number of things, from worn rings to a cracked head.

Answer 4

Valve seals.

There's a seal that goes around the valve seal where it goes through the head into the combustion chamber. As the engine cools down, a bit of oil drips down causing the black smoke on startup. It's not a terribly difficult fix if (IF!) you have the proper tools. Unfortunately, it'll likely be a bit pricey at your local wrench.