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Megane Scenic misfire P0300

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Old 5th February 2013   #1
wightmanp
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Megane Scenic misfire P0300

I have a Renault Scenic 55 reg 1.6l petrol. It has develeoped what feels like a misfire at around 2-2,500 revs. Below and above that range the engine runs well and pulls hard to the red line. When it misfires there is a noticeable vibration from the lower front end of the car.
Engine diagnostic shows OBD code P0300 - random multiple cylinder misfire. Plus P0340P as a provisional code - Camshaft position sensor malfunction. Plus the usual "check emmissions" warnings
The misfire has to effect more than 1 cylinder for this code to appear. Plugs, leads, coils could be to blame but before I start random replacements of parts i wonder whether anyone else has come across this type of fault. Cheers.
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Old 5th February 2013   #2
madnoel10
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Re: Megane Scenic misfire P0300

Firstly Renaults use a different protocol in their ECU's so the fault code you have may be totally misleading. In other words take it with a great big pinch of salt.

First thing to check would be the spark plugs - what colour are they - are they all of the same colour. That may give a clue as to which cylinder is at fault.

Also the spark plugs are wired in pairs so it is not uncommon for two cylinders to be affected.
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Old 5th February 2013   #3
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Re: Megane Scenic misfire P0300

Thanks for the advice. I'll give the plugs a try first.
Currently in wightmanp's garage:
Rernault Megane Scwenic 2006 1.6i
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