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Angry Renault Megane Engine Idling

Hello there,

I am not mechanic and have always relied on my local garage but the current fault on my Megane has everyone stumped.

My car is a 2004 Renault Megane Dynamique 1.6 Petrol.

A couple of weeks ago when pulling away from some traffic lights I lost all engine power. RPM dropped to idle (1000 RPM) and my throttle was unresponsive. I put the car into neutral and it immediately cut out. after a restart all seemed to be ok. Then later that day the same thing happened again. So I took my car in and had the codes read. It had P0300 & P0340 codes. My mechanic suggested it was a faulty cam shaft sensor and replaced it. After a few hours the fault re appeared so he took the car back and warned me that it may be my cam belt. After inspecting the cam belt and dephasor and finding nothing wrong with any of them he suggested replacing the cam shaft sensor with an official Renault part as sometimes non manufacturer parts don't work as they should. this again made no difference at all. My car has been running with this fault for a week now and it has got a lot worse. My engine management light keeps lighting up, service is on. I have had the dash display injector fault. The car is constantly juddering and even cutting out and bump starting itself while I am on the motorway. My mechanic is telling me it may be the ECU in which case the car needs scrapping.

Has anyone ever had this issue and know of a solution to it?
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post #2 of 9 (permalink) Old 3 Weeks Ago
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Re: Renault Megane Engine Idling

First change your coils , then your mechanic.
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Regards Tim,
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Give a n00b the answer he will be learn for a day; show him the search button, he will learn for life.
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Re: Renault Megane Engine Idling

OK I think I am getting closer to resolving the issue.

I replaced the coils myself as its a pretty straightforward job. The engine idling issue was still present though to removed the coils and checked the plugs. I noticed that the middle 2 plugs had a ring of oil around the base so I replaced all 4 plugs and for the past 3 weeks my car has been running fine.

However this week its happened again so going to remove the coils and check the plugs. If there is another puddle of oil around my plug I am guessing the rocker gasket is leaking.

I will keep the post updated with my progress for anyone else having the same issue.
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Re: Renault Megane Engine Idling

There's often a dribble there. Years ago, I posted about a possible correlation between wide plug gaps & coil failure.
In that, for the plug gaps, (and oil IMHO) 18000 miles (service interval) is TOO LONG.
Therefore, I now Service every 9000 miles, gapping the plugs too & replacing at 18000.
Not had a coil failure since.
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Regards Tim,
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Currently in Nottnoc's garage:
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Re: Renault Megane Engine Idling

I've took the coils out and had a look at the plugs looking from the top down there's no oil on them nor is there any signs of oil on the coils .
checked the codes again and I am still showing as engine misfire and cam shaft sensor.

The plugs and coils are only 3 weeks old I've done less than 200 miles since they were fitted. I must be on the right lines of whatever is causing the fault as when I replaced my plugs the problem went away.

Is it possible for oil or something to come from underneath the plug and effect the sparking?
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