What am I ....Missing?

[Josh Youare]

Hi

For the last couple of weeks I've been trying to get the engine management light to stay off.
I've had two code readers of it, and they both say 'Random/Multiple cylinder misfire'. Put it this way. If there actually is a misfire, it's very minor and I can't hear or feel it.
The light comes on when the engine is warm and idling, which its at ~600 RPM?

So far, I've tried the following:
-Changed Coilpack
-Changed TDC sensor
-Checked for oil in the spark-plug wells
-Checked spark plugs (they're about 2 years old and still look quite new)
-Checked voltage from lamda is okish
-WD40 everywhere
-Redex
-Cleaning the car (trying to appease it)

I've also unplugged HT leads and injectors 1 by 1 to see if any where NOT effecting the idle (all make the car turn into a subaru).
Next up I've thought about changing the HT leads or perhaps organising a séance!

PS: The light might come on less if I've running on better fuel (Shell, BP, not tesco).

Thanks for your help.

 

[182Trophy]

Checked the cat for join wear. Can sometimes cause the light to come on.

 

[MarcB]

I would change leads and then the Injector as this is normally the culprit.

I had this problem for over a year before i changed all 4 injectors and it was perfect.
You can buy them new for around £38 from eBay.

 

[bloke]

what code readers you used?

 

[MarcB]

what code readers you used?

In the end a Renault Clip at a Renault Specialist

 

[bloke]

In the end a Renault Clip at a Renault Specialist

sorry, meant the op. assuming it's going to be cheapy obd reader.

 

[Josh Youare]

Thanks for the replies.
Cheapy obd reader and a snapon one at the local garage.

I was going with the approach of 2 readers giving the same result meant that it was correct.
You're right tough. A clip would be better.

 

[bloke]

even snap on is hit and miss to say the least.

what was lambda voltage and at what coolant temp?

 

[Josh Youare]

It was all the voltages lol.

I checked the live data. Once it was up to temp it jumped about. MPG is ~40 so I think it's ok.
The other one (post cat?) was steady but I cant remember the voltage. I didn't know if that one mattered?