2006 C4 Hatch Hdi 1.6 Blue Puff of Smoke on Start Up

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boristhespie
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2006 C4 Hatch Hdi 1.6 Blue Puff of Smoke on Start Up

Post by boristhespie »

Hi. The other half has a C4 hdi from 2006 which bellows out a big puff of blue smoke on start. But only on start. I remember something on WD saying what this is but just wanting to run it past you experts.

She does get a coolant low warning so was worrying about head gasket but the coolant remains same level so think it is a faulty sensor.

Anyway any ideas?

Also, is K Seal a good idea?
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moizeau
Donor 2022
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Joined: 12 Jan 2015, 17:08
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Re: 2006 C4 Hatch Hdi 1.6 Blue Puff of Smoke on Start Up

Post by moizeau »

Blue is oil. When you say 'on start', is that every start, hot or cold, or just when the cars been standing overnight for example? Could be a sticky scraper ring when cold or a weeping valve stem seal, possibly turbo but I'm not really very knowledgeable about those. I'm sure you'll get more advice and thoughts.
How many miles has it done?
boristhespie
Posts: 885
Joined: 07 May 2009, 19:51
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Re: 2006 C4 Hatch Hdi 1.6 Blue Puff of Smoke on Start Up

Post by boristhespie »

I think it is just in the morning. She only drives two legs of the same journey. I don't recall is smoking, or at least being as evident later in the day.

It's done about 130,000 ish (I think).
Last edited by boristhespie on 11 Apr 2022, 17:36, edited 1 time in total.