2005 Renault Megane Engine noise when starting engine

2005 RENAULT MEGANE
160,000 MILES • 4 CYL • FWD • MANUAL
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GAVIN01
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Hi.
I have a 2005 Renault Megane sedan 1.6L manual which has done a mileage of 160 000 kilometres. When the car starts (from a cold start or when the car's airconditioning syatem is switched on), the engine makes a loud noise like that of a diesel-powered car (even though my car is petrol-driven) and then stalls leaving a "rich" odour of exhaust fumes. When starting it again a second time, the noise does not persist and the car drives smoothly without any problems.
Please tell me what this is and how to repair it.
Gavin
Apr 26, 2010 at 7:11 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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