Puff of white smoke on starting

[mickyboy22]

Hi Chaps,

I have just bought an Audi A4 Avant, 1.9Tdi Sport 02Reg, engine code AWX with 118000 miles on the clock.

When I start the engine after a couple of seconds I see a puff of white smoke come out of the exhaust. Could this be a heater plug off, causing unburnt diesel.

Thanks for any feedback.

[a8 tech]

there is a puff who lives over the road from me and i see him every morning when i start my car,wife says he is into blonds so i am ok.lol hahahahahahahahah

no fault keep a check on the coolant and check for fault codes

[benjie]

My MkIV Golf diesel did this and it was either the coolant temperature sender or the glow plugs (I changed both and it went away).

Just an idea. It will probably show a fault in vag-com if it's the coolant sender.

[RickT]

Hi Chaps,

I have just bought an Audi A4 Avant, 1.9Tdi Sport 02Reg, engine code AWX with 118000 miles on the clock.

When I start the engine after a couple of seconds I see a puff of white smoke come out of the exhaust. Could this be a heater plug off, causing unburnt diesel.

Thanks for any feedback.

How many miles are you doing each day?

Condensation?

Check the coolant and then the oil for trace of a "cream" build up. - if cream build in oil or around cap.. head gasket.


Rick

[mickyboy22]

I am doing about 34 miles a day, but have done some longer runs recently of about 90 miles. It is definately smoke I see for a couple of seconds rather than steam. Will check the water and oil later and let you know.

Thanks

[mickyboy22]

Checked the oil filler cap and it's clean, no mayonaise, dipstick shows no sign of water and the water level is ok as well.

Still think it is a glowplug or two off.

[richard_gomm]

any luck with this? I get a very similar problem on my AWX. replaced all plugs and checked all power is good through the harness. Still no idea why....

[benjie]

any luck with this? I get a very similar problem on my AWX. replaced all plugs and checked all power is good through the harness. Still no idea why....

Done the coolant temp sensor?

Or plugged it in to VCDS?

[richard_gomm]

Done the coolant temp sensor?

Or plugged it in to VCDS?

got a post running

https://www.vwaudiforum.co.uk/forum/s...116#post378116

but yes changed coolant sensor and i have vagcom

cheers

[mickyboy22]

Hi Chaps,

I have not found any cause to my smoke on starting problem, but, (not wanting to jinx things), the problem appears to have cleared up somehow.