Renault Scenic - Faulty Coils Causing Warning Light(Including General Info)*fixed* - Page 4 - Renault Forums :: Independent Renault forum

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post #16 of 121 (permalink) Old 10th January 2007
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Originally Posted by lagdti View Post
To test them,disconnect the injectors one at a time and not the coils .The coils are wired in pairs,so if you disconnect one it takes another one out too.(Hence the amount of people on the forum who have had two replaced at the same time,when one would have fixed it........)
That's handy to know. Thanks Lag. REA did tell me that they work in pairs but I didn't associate it with such a situation. Well spotted, bro.
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post #17 of 121 (permalink) Old 5th April 2007
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Renault Scenic - Coil Problems

My 2000 Xreg 1.6 Scenic RXE Auto had its coils replaced about 2 years ago by the AA using genuine renault parts.
Driving home from work today on the M27 the car started to judder and loose power. I managed to get it home but I suspect its the coils starting to play up again.
I disconnected the leads to the coils one by one and engine stopped on 1, 3 & 4. Disconnecting No 2 made no difference to the lumpy engine.
I'm therefore assuming that No 2 coil is gone.
A quick phone around and I can pick up a new set of coils on Saturday at 29 +VAT each (geniune Renault parts) or 20 each for "aftermarket spares".
A couple of questions:
1. Do the coils just push onto the spark plugs?
2. Is it worth buying the more expensive renaulkt coils ?
3. Should I change spark plugs as well?
Any help would be much appreciated
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post #18 of 121 (permalink) Old 5th April 2007
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1. Yes
2. IMO, no as its quite obvious that OE coils don't last, were never any good and can't believe Renault get away with the number of coil replacements people need on such a critical item. Its appalling the amount of failures people experience. They should be hanging their head in shame and giving them out free. It must be a huge cash generator for them. How much worse can anybody elses be? If buying a non OE part I always try to stick to brands I know i.e. lucas, Bosch etc...
3. There should be no need to change the plugs. Most garages just fit the coil and away you go. It you have the time, I don't think there is any harm in giving the plugs a look whilst your in there, but its not necessary.

My father in law does very little mileage and before his car had done 12000miles from new all the coils failed (out of warranty) one by one within a short time period of each other. He's recently had to replace a relacement which has only been in around 2 years and less than 8000 miles.

It would certainly put me off a petrol engine that uses these coils . My local garage (not a Renault dealer) actually keeps the coils in stock as they replace that many of them. It takes them only a few minutes to change a coil .
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post #19 of 121 (permalink) Old 5th April 2007
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I would at least change the plug on the cylinder that wasn't firing as it has been subjected to poor running conditions and is likely to fail shortly. If it were mine I would change all the plugs - that way, all are of the same vintage and condition.
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post #20 of 121 (permalink) Old 5th April 2007
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Yes,change the spark plugs.

No,don't bother with genuine Renault coils ,buy some Beru aftermarket ones from a decent motor factor as they are many times more reliable then the Renault ones.

Yes,the coils are just pushed on to the spark plugs and are held with either a T30 torx headed bolt or a 10mm headed bolt.

Disconnecting the coils is not a way to find out which one is faulty as they are wired in pairs,but as your going to change all of them,it doesn't particularly matter.

I'd rather push my Alfa than drive a BMW....
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