Renault Scenic - Faulty Coils Causing Warning Light(Including General Info)*fixed* - Page 24 - Renault Forums :: Independent Renault forum

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post #116 of 121 (permalink) Old 25th October 2014
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Re: Renault Scenic - Faulty Coils Causing Warning Light(Including General Info)*fixed

Hi, Back to the old poor performance and fuel economy again!

Can anyone help in my issue!!

54 plate Scenic 1.6 16v k4m engine that I have put in new air filter, oil and filter and new plugs due to the wife saying its running rough and stalling. There are no engine error lights on or any warning messages. I have had coil pack issues before but they come up with error messages and changed them in the past.

I have heard it could be the TDC sensor or something, or it could be the coil packs again! Advice and help if it is the TDC and where it is and how to fix it!

Please help as it now stalls at both cold and hot temperature, and is using lots and lots of fuel!!! MPG has dropped through the floor!!
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post #117 of 121 (permalink) Old 3rd January 2016
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Re: Renault Scenic - Faulty Coils Causing Warning Light(Including General Info)*fixed

First of all really sorry if the answer to below is in the thread - tried to find it but couldn't see it.

Bought a 2003 1.6 petrol scenic for my girlfriend and it was running fine for a day but after a petrol fill (I don't think it's related .. just bad luck on that start up) car shaking when idle / lack of power / little power going up hills (you need to go back in gears) etc. Car's not backfiring but very shakey when just sitting. Reading the thread it looks like coil issue.

Opening the bonnet I see there are 4 coils .
One on the far left as I look at the engine looks different from the others so think that was changed.

Ran car to see if one was faulty (expected to unplug faulty one and car would stay on showing me which was bad) but when I unplug any of them the car cuts out.
Not sure if that's because the other one in the pair stops working so then 2 coils have then effectively stopped? Don't know.

I 'think' that - looking straight at engine that the numbering is 1 - 2 - 3 - 4 with 1 and 4 and 2 and 3 paired?
I ask because if 1 was changed then the most likely to be gone is 4?

Should I replace the lot or just keep putting in one new coil in and starting it to see which has failed? Presume the car will run well when the bad one has been replaced.

Lastly is it damaging to the car to run it as it is - have little choice at moment as can't get coil in for a few days but just to know how urgent to fix it .. Monday or later in week .. not planning to drive for a month or anything.

Thanks for the help and again apologies for being fairly clueless.
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post #118 of 121 (permalink) Old 3rd January 2016
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Re: Renault Scenic - Faulty Coils Causing Warning Light(Including General Info)*fixed

The coils do run in pairs as you have found out by disconnecting one coil the engine stopped so now you know which pair as one of the coils is faulty I.e 4 or 2 you can replace the faulty coil by changing one or the other but it is generally accepted that the pair are replaced.

To run the car in this condition, misfire, you can do damage to the catalytic converter so not really advised.

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post #119 of 121 (permalink) Old 4th January 2016
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Re: Renault Scenic - Faulty Coils Causing Warning Light(Including General Info)*fixed

Just to note that I have the issue fixed.

Brought to a local mechanic who connected to computer but found no errors .. said he'd have to look at it the old fashioned way and replace coil 's one by one until bad one found.

He started with the 2nd from left and car started and ran perfectly so concluded that this was the problem.

This was a coil he had 2nd hand.
Wonder is it now best to replace all coils or just buy a spare and keep it ready? Car is 2003 with 143,000km.

The car was driven for weekend without this being fixed - would this have damaged the Catalytic converter (how would I know?) or if I've got away with it up to replacing it does that mean it hasn't been damaged and I can relax?

Thanks

Neil
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post #120 of 121 (permalink) Old 4th January 2016
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Re: Renault Scenic - Faulty Coils Causing Warning Light(Including General Info)*fixed

Get your self a set or just 2 coils and the tool to change them keep in the car ready as they can go at anytime no matter how old they are
Ron
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