Forums / Citroen C4 Picasso and Grand C4 Picasso (B78) Road Tests and Model Reports / Carbon deposits on the cylinder head - C4

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Carbon deposits on the cylinder head	Please Register to enjoy additional Member Benefits

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Croady United Kingdom

Wed May 20 2020, 05:09pm

Member No: #56098

Joined: May 20 2020
Location: London

Hi, new here and looking for some advice on what has caused carbon deposits to build up in the cylinder head and lead to loss of power and shuddering by the engine on my 2016 1.6 petrol automatic C4 Picasso. According to the extended warranty people, the cost of cleaning the cylinder head is not covered under the insurance but the dealership aren’t being very helpful with telling me what has caused it. If anyone has experienced the same or similar problems I’d be very grateful it you could let me know how you resolved them. Thank you

gittos United Kingdom

Wed May 20 2020, 11:12pm

Member No: #30055

Joined: Apr 02 2013
Location: Bolton

Could be leaking fuel injector(s).

vexorg United Kingdom

Thu May 21 2020, 03:11am

Member No: #48843

Joined: Jul 06 2017
Location: Scotland

Carbon build up isn't so common these days. Better fuel, engine management, etc helps it run better.

How many miles on it?
What's your driving pattern? lots of very short journeys? or 500 miles a week?

You do get companies that offer that, like terraclean, I'm dubious on the benefits. If it was that bad that it affected the running, the I'd take the head off and see for myself.

A bit of carbon does help as some will know that a completely reconditioned head runs better after some miles since the carbon helps seal it.


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