new exhaust (diesel car) now getting white smoke

mutley74

my dad recently changed his exhaust at a small garage. Only the back boc was changed as previous one the clamp has rusted away completely. Car is over 6 years old.

now a few times he has noticed a big plume of white smoke. Anyone know what causes this?
(never had any smoke before)

todolistsocd

Hi,

brand new exhaust should not have any smoke coming out of it.
Quick answer:
Normally, thick clouds of white smoke coming from the exhaust on start up or acceleration, suggests water mixing with oil.
Normally associated with head gasket going.

hope this helps!:)

mutley74

todolistsocd wrote: »

Hi,

brand new exhaust should not have any smoke coming out of it.
Quick answer:
Normally, thick clouds of white smoke coming from the exhaust on start up or acceleration, suggests water mixing with oil.
Normally associated with head gasket going.

hope this helps!:)

huh....that is bad news he does not need! What is suprising there was no smoke at all before the back box change, Could the back box change have anything do it with the smoke?

BTW the back box was supplied stated for 1.6HDi, but parts supplier stated it was compatible with his 2.0HDI,could this have anything do with it?

todolistsocd

Hi,

Inital answer to both sentences,
If there was no smoke before and there's smoke after then obviously, something has changed in between and since a back box has been changed in the "In between", that's the first thing I would address.

As for the second one, exhausts are versatile by compatilbility and the only problem you would have with exhausts would be shaping around certain parts underneath the vehicle.

You'll get many vehicle "witch doctors" who will give you their version of what they belive is wrong however; you must not be deviated from the original issue.
An exhaust pipes only purpose is to "transport" gasses produced by the engine away from it....Simples.
No gasses coming from the engine, no plumes of any colour smoke from the exhaust full stop.

there are 3 main colours of smoke from exhausts:
1.White - associated with water/coolant burning (Sometimes brake fluid)
2.Blue - Associated with engine oil burning
3.Black - associated with fuel burning

But like I said in the beginning, there should be no smoke coming from the exhaust whatsoever, unless there is something wrong.

asbokid

it might just be moisture that has settled in the exhaust.

to be vigilant, keep an eye on the coolant level on the engine.

if it is white smoke rather than water vapour, that could indicate the failure of an exhaust valve or a piston ring.

what car is it?

forgotmyname

water vapour or head gasket or unburnt diesel fuel or just burning the oil and debris
inside the exhaust box.

If it does it after a couple of long hot motorway journeys then start to worry but short term keep an
eye on it.

mutley74

Thanks for the replies. Car is the old type citroen picasso 2.0 HDI, over 6yrs old, 76K on clock.
It made a massive whte plume when he did a shot trip yesterday morning (<4miles). But later he took the car out but could see no "smoke". Will keep an eye on it, thanks for replies.

gilbert_and_sullivan

Ah Citroen, would this model have a FAP (DPF), might have been the burning off of the filter that caused the white smoke.

If 'twer mine i'd just keep an eye on things and wouldn't be worrying too much, maybe give it a good run next trip and blow it's cobwebs out.

Another thought occurs, was the smoke definately coming OUT of the exhaust pipe, or could it have been paint burning off the outside of the new box pipe?

cardinalbiggles

Some really crap advice on this thread. Its a diesel if your getting plumes of white smoke as mentioned earlier its either the DPF or unburnt diesel getting into the exhaust. If it was water it would be constant and your car would quickly overheat.

marksandsparx

cardinalbiggles wrote: »

Some really crap advice on this thread. Its a diesel if your getting plumes of white smoke as mentioned earlier its either the DPF or unburnt diesel getting into the exhaust. If it was water it would be constant and your car would quickly overheat.

Yep.. I was going to say that! lol

mutley74

cardinalbiggles wrote: »

Some really crap advice on this thread. Its a diesel if your getting plumes of white smoke as mentioned earlier its either the DPF or unburnt diesel getting into the exhaust. If it was water it would be constant and your car would quickly overheat.

DPF meaning?

Would unburnt diesel not come out as black smoke?