The tdc sensor .... or coils? - Page 4 - Renault Forums :: Independent Renault forum

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post #16 of 19 (permalink) Old 23rd April 2010 Thread Starter
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Re: The tdc sensor .... or coils?

First a quote from the HAYNES Renault Megane 1 manual: "The components of ignition systems are normally very reliable", okay when you have stopped laughing let me say that I have just purchased a Valeo coil from my local autofactor for just under £28 and, apart from me initially misdiagnosing the correct coil , it was easily fitted and the car runs well again. The autofactor guy told me they have sold several makes of pencil coils but none appear to have been totally reliable in Renaults. Because other manufacturers who also initially blamed Sagem for poor components now no longer have the problem he believes it is a Renault engine design problem. The Valeo webpage now claims that the life of its latest pencil coils is expected to rise from an average of 50,000 to 100,000 miles (although it doesn't specifically say in Renaults). One of my replacement "improved" Sagem coils lasted under 15,000 .... I am not convinced that the cost of changing them all is justified when the life of any one of them is so unpredictable so I'll just wait for the next one to go and hope Valeo is better than Sagem!
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post #17 of 19 (permalink) Old 16th May 2010
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Red face Re: The tdc sensor .... or coils?

Seek out Probe Distributors - they are Essex way
but also have an outfit in Preston (under a different name)·
The coils to an improved design in 2009, did carry a three warrantry. Also with the TDCs, are much lower cost than most suppliers. They do a next day service.
Personally I have no business connection- only bought from them. These ignition specialists supply numerous units for many marcs.

Finally on to my favorite hobby horse.
If you only replace one coil , the others usually fail later like a domino affect. Replacing all with Renault parts is eye watering. But this action makes sense, if a good replacement can be obtained.
In the past like on road side recovery call outs, most cars have a quick repair done. The occupants delighted to be on their way.
' Out with the faulty coil - In with the new one.'
Five/ten minutes at most (once the truck arrives & diagnosed which coil - one of four but usually No.2!)
However it is also best practice to remove the spark plug from the particular cylinder & clean it.
Should the breakdown be on a dark, wet wintry night/day
-THEN do this secondary clean/gap check ASAP. This driver following professional advice will clean them all.
Reason being when a coil fails it causes extra load on the other cylinders and messing up of the plug attached to the faulty unit. Naturally there are other problems with cars other than coils !
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1.6 Megane Saloon MkII 04 - previous MkI - wrote off- back ended
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post #18 of 19 (permalink) Old 2nd November 2012
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Staring problem

I also have a starting problem electrical fault showing on dash lights, wipers going also head lights? car won't start ? only goes if towed and bump started, can anyone help jazzman11
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post #19 of 19 (permalink) Old 4th May 2013
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Re: The tdc sensor .... or coils?

Hi folks

I've just had this problem of rough running and didn't realise the Megane had a coil for each plug. Reading through all the posts about this problem it doesn't take a rocket scientist to realise a coil (or coils ) have failed and as I'm not one of those that the Renault dealer sees comming as £40 - £60 for one would make my eyes water looked on that popular shopping site for a cheaper price.

Got a set of four pencil coils for a total of £41 with a 2 year warranty and they were delivered the next day, a real no brainer. Took 40 mins to fit, fired the engine up and she now purres like a kitten.

I'm now going to order another set of four as spares for when these eventually fail, can't see the point of changing just one together with the hassle of trying to discover which one it is in the first place.
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2001 Renault Megane Dynamique+ Coupe 1600cc
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coils , sensor , tdc

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