Question about 2005 Renault 181

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My engine light started to flash orange on my 03 renault megane. the car also began to judder. I have been experiencing problems starting the car and think this may be connected

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I have a 2000 megane and have had a problem like this a few times in the past. In each case, the problem has been due to a broken coil - this has a separate HT coil per spark plug, fitting directly onto the spark plug, and the coil breaks, so that the plug doesn't fire and the engine judders. I think the light is because the engine management notices there is unburnt fuel coming out.

I'm told there was a known flaw in the design of the earlier coils, but it's supposed to have been rectified. But I've had a newer fail, and now carry a spare. Easy enough to fit - tricky part is identifying which one has failed - can remove one LT connection at a time to see if anything changes - I've always stopped the engine between tests rather than doing it live. This might be bad for the engine - I don't know. I was told you should replace coils in pairs, but don't know about that.

But I guess it could also be a break in the LT wiring, or a fouled spark plug. Or something else entirely.

Posted on Sep 09, 2010

  • daal42 Sep 09, 2010

    Oh - a trick someone once told me - when trying to diagnose a misfiring spark plug, listen to the exhaust while it;s idling - should hear or feel a regular pulse as each cylinder fires, but if there's a regular misfire, you'll notice the gap.

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