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Discussion Starter #1
Sorry, it's me back again. Have tried new TDC sensor with old connector (shaved off two plastic lugs as mentioned in RenaultForum instead of rewiring new plug). Engine starts in same way (now easily but very rough) with old or new sensor so I now suspect coils. Coils last changed 13,400 miles ago and was told by Renault Main Dealer that the old batch had been superceded by new coils from new manufacturer. Looking at threads on "coils" I suspect my "new" coils were not from a new manufacturer (they are grey Sagem's). They have lasted almost exactly half the mileage of the first set! Any suggestions as to how to approach the Dealer who so far has done all my servicing .... this appears to be a "known fault" which still has not been resolved ... or was I fobbed off with the same type of old faulty coils?
 

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Discussion Starter #3
Hello again Chris. I haven't run the engine long enough for any fault lights to illuminate ... I remember when the coil(s) failed before it wasn't until the next day that lights appeared. That was in the days before faulty coils became common knowledge! I don't want to run the car more than necessary as it is and am thinking of a 'phone call to the dealer and a diagnostic check with them first. They are within 10 miles.
 

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Discussion Starter #5
I understand the possible damage. Thought I might give the dealer a chance to keep my custom and for that they would have to do the check themselves .... if it is the coils again I can see a "discussion" with the service manager will follow. If no help is forthcoming then I guess they lose my loyalty and custom and RCS get another dissatisfied Renault owner! Pity, I've had a Renault 16 and 21 before and was quite happy.
 

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Discussion Starter #7
Result! Main Dealer immediately found one dead coil ... quoted £106 to fit one new ... one plus another £166 to replace all. Friendly enough until I stood my ground reiterating the fact that these were supposed to have been "better" coils to replace the initial bad batch so why the early failure. Initially advised the car well out of guarantee period so no help forthcoming and to change all coils because if one goes the others are likely to follow .. then suggested latest failure was "one of those things" as they are electronic and do fail, also advised that there is no adverse effect in changing just one. Logic seemed to have disappeared at this stage, the conversation was getting heated, and I asked them to contact RCS. RCS approved replacement of the failed coil ... I don't know how the conversation went but I was told "that I am very lucky and that that doesn't usually happen; if any more fail they will each have to be dealt with as and when", so do I expect further failures or not? I suspect I do.
Well done RCS, my sincere thanks to all those who have contributed to the "coil saga" in the past ... but why does
one have to cause a fuss to get satisfaction over a known problem ... what has happened to good customer relations?
 

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Hi, found the forum after lots of probs with car.

Had the near side cv joint replaced about 4 months ago (£200) and ever since the engine has lost power at times but after a quick rev is back to normal.

It is getting to be quite common now. I took the ht leads off when it was rough running and the outer two (1+4) were not sparking so looks like a coil issue, also took the tdc sensor off and visually it was fine (also just had new centre box put on as completely corroded).

I've got a big journey tomorrow so will change the coil and check the old one when with a multimeter when I can but it is an intermittent issue so will prob not show! Only thing is do coil issues normally go away when revved or could this be an emc prob?
 

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BlueMegane has one major coil with HT
(1/4 inch diameter) leads routing from it. However others in this thread have the alternative engines which use coils (4) - one on each cylinder/spark plug fed by two thin wires into a plug socket.

Apart from the earlier batch of Sagem coils that proved faulty, it is increasingy the case that these coils breakdown. Beit through the specification, faulty manufacture or the hellish conditions they have to operate under. Unventilated significant temperatures.

Again, mainly because of cost Renault dealers charge around £45 each, and even alternative parts are not cheap. The usual modus operandii, is to trace the faulty coil, and replace it.
One then merrily trundles or to be fair, smoothly gets on one's way, happy to be on the road again for less than a hundred quid. But experience shows that usually, within months the problem reoccurs - another coil goes down! Domino effect or life expectancy?

The best procedure is to replace all FOUR ASAP, a batch invariably these will carry a 12 month warranty.

As for costs, sadly from the vast number of reports of the failures of Renault coils, perhaps alternatives might
prove, firstly cheaper but also better made.The number of Renault owners who are paying out of these coils is an outrage. It is not as though the company do not know of the problem - yet they, Renault are changing them on warranty PLUS owners out of time, end up with costs plus inconvenience.
It's a good earner, simple, quick to sort out, then there is the 'added on' diagnostic tests.

This writer recently replaced just two, to check up on the above prediction - In less than eight weeks another original one failed. All were Renault bits.
History - not known.
Codes 4-083 & 4- 084 - same fit though

A set of new 'improved' circuitry coils are now in place
- made in China! I will not upset readers by quoting the price. Sadly only 12 months guarantee - originally
the old specification had three years. But then this new spec. needs to be tested in the field again.

As for fitting - the four at one go - Easy with care - about 40 minutes maximum including rechecking the fault codes. All you need is a socket set and some lube.

I love my Renaults, perhaps because I'm a glutton for punishment - One has learned to live & deal with
the challenges. An advanced design car, hijacked by people wanting to repair them. Or just perhaps, they like their customers to call in for a coffee repeatedly!
But why should this continue?
SamWoe
 

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Got a coil from a scrapyard as it was sunday and necessary, problem had stayed at a niggle for so long then suddenly got worse.

Was a clio coil so almost identical but had to change 2 ht leads also, the car itself is not worth much more than the coil so a new one would be a waste.
 

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Discussion Starter #15
Interesting to see the problem with coils continues.... it looks like I had another failure of a coil today. I gave up with my local "Customer Services Manager" and his attitude to out of warrenty customers some time ago and will never step foot in a Renault dealership again. The problem is easy to fix, just have to find and fit yet another coil! Like the cars, useless dealerships!
 

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Discussion Starter #16
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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Seek out Probe Distributors -
www.probedistributors.co.uk 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!
SamWoe
 

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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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Hi folks

I've just had this problem of rough running and didn't realise the Megane had a coil for each plug.:crazy: 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 :eek: looked on that popular shopping site for a cheaper price. :cool:

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. :d:d:d:d

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. :d:d:d
 
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