Peugeot RCZ - carbon build up in cylinders | Ask Honest John

Peugeot RCZ - carbon build up in cylinders

I have a four year old Peugeot RCZ with roughly 20,000 miles on the clock. Five months ago the engine warning light came on and after a diagnostic test I was told that the problem was a carbon build up in a single cylinder.

This was cleaned out with two new valves and all went well until four months later when exactly the same thing happened. The car went through the same diagnostic scenario but this time repair was £1000 due to it affecting three cylinder heads.

I was told this was probably due to low mileage around town. Since June I have significantly increased the mileage to 1000 miles a month and it seems to have made matters worse. Is it time to change to another car and is this a problem related to the RCZ model?

Asked on 9 November 2014 by dinners

Answered by Honest John

It's a problem related to most Direct Injection petrol engines because fuel does not come in via the inlet valves so does not clean them. VAG has now countered the problem with its EA888 2.0TFSI engines in which fuel is injected both directly and indirectly. It's possible that your engine can be cleaned up by the Terraclean process, without the need to dismantle it: www.terraclean.co.uk/

Tags: technical issues

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