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Noise when cold

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Sat Jan 20 2018, 05:13pm
Joined: Dec 08 2015
Member No: #2430
Location: Arad
I'm experiencing a weird sound when cold starting in winter. This happens only when the outside temperature is below about 7 degrees Celssius. It does this for about 1-2 minutes after start-up, maybe longer if it's colder. Also a very discreet shajlke is can be felt when it makes the sound. I diagnosed it with Lexia and spikes in the injection quantity were seen during this behaviour.
The noise can only be heard from inside. Also this is the second winter with the same symptom. I have the car for about 2 years and drove about 60.000km.

Please check the link for the noise and thanks for the support.

- Click Here -
Thu Jan 25 2018, 08:48am
Joined: Jan 21 2013
Member No: #1163
Location: Warsash, Hants & Palma de Mallorca, Spain
That’s an odd one. Never heard that in mine!

Shaun? Phil? Tjensen?
Thu Jan 25 2018, 11:05pm
Joined: Dec 19 2010
Member No: #320
Location: Bedfordshire
Not heard that noise in my C6 3.0HDi.
I'm assuming you mean the intermittent but slightly rhythmic light knocking noise.

Could it be the auxiliary drive belt and/or tensioner?

Has your engine had any of the belts changed (auxiliary, fuel pump belt or timing belt)?

Thu Jan 25 2018, 11:37pm
Joined: Dec 08 2015
Member No: #2430
Location: Arad
I have tried removing the auxiliary belt and still no change. Without the belt the symptomps are the same. So this excludes the tensioner, alternator, AC compressor.
I have not yet replaced the timing belt but given the fact that it does like this for more than an year I doubt that could be the cause.
Fri Jan 26 2018, 07:41pm
Joined: Oct 29 2014
Member No: #1924
Location: Kuopio
Could it be a motor trying to operate one of the air flow control flaps in the heating system?
Wed Jan 31 2018, 11:24pm
Joined: Dec 08 2015
Member No: #2430
Location: Arad
I kind of doubt it because with the ventilation off it makes the same sound.
Thu Feb 01 2018, 11:48am
Joined: Jul 17 2012
Member No: #954
Location: Bergen
Are all the glowplugs working ?
Sun Mar 11 2018, 11:45am
Joined: Mar 06 2018
Member No: #3460
Location: Kouvola
Same clacking sound here too. Car is C5 3.0 Hdi. It happends only with cold air and engine. I think it must join to EGR- or secondary air intake systems because sometimes it will activated when car idling and get step on the accelerator.

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