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Matt
Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 21864
Experience:  BEng hons Mech engineering, in auto industry 22 years
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1.2l Renault Clio 2010 hard to start sometimes when cold? J

Customer Question

1.2l Renault Clio 2010 hard to start sometimes when cold? J k
Submitted: 2 years ago.
Category: Car
Expert:  Matt replied 2 years ago.
Hello

I'd 1st replace the spark plugs if any of them fail this checklist:

http://www.ngksparkplugs.com/tech_support/spark_plugs/faqs/faqread.asp

it can also be incorrect fuelling due to a faulty water temp sensor. If this is the problem then the ECU will be not be adjusting the fuelling as the engine warms - so unplug the sensor and clean the contacts on both sides with some switch / electrical cleaner (not WD40) and inspect the wiring for any signs of damage to the insulation especially where it runs over other components and through the bulkhead- if this doesn't help consider replacing the sensor as they're not expensive