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post #11 of (permalink) Old 17th February 2012
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Smile Re: Renault Megane - Engines - Juddering megane

Unlike old engines that had a large single coil bolted onto the side of the engine, about the size of half a pack of butter/marg with thick wires to each plug - Renaults (petrol) usually have a coils like a cigar on each plug, going 'into' the bowels of the engine. Two thin low voltage wires feed the current to each 'cigar' which converts to high voltage at the spark plug. Renault genuine parts are probably now about £40 each. Usually, just one breaks down -BUT if you replace just one (once you discover which it is!) then you could be saddled with another 'going' a short time later. Having previously had this problem, within days of buying a S/H Renault (independent)- the garage brought in a specialist and replaced the faulty one. The garage obviously had not had this fault previously.
It is not difficult to affect a repair - I observed the fitter progressed through the four plugs until by replacing the faulty one - suddenly it caused the engine to run sweet. Caution:- the wee screw that holds the coil in place MUST BE HANDLED WITH EXTREME CARE - its too easy to strip the threads in the engine block. Not a terminal problem, however best not messed up.
Incidentally I brought my new coils through the INTERNET - not genuine Renault ones -but the they
did carry an amazing three year warranty - And experience has shown they were an excellent bargain - Approx 1/3 the price quoted by Renault dealer- delivered in 24 hours. I have no experience of the cost a Renault dealer would charge for fitting.
I was advised to replace all the coils - good advice proof in the Pudding. Failure of just one on your motor, puts strain on the remainder plus the engine runs very badly. Otherwise general servicing is all that has been required -just fitted Michelin Alpin
tyres, high cost, but a super ride - very impressed.
Currently in SamWoerth's garage:
1.6 Megane Saloon MkII 04 - previous MkI - wrote off- back ended
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