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Erratic Idle

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Old 2nd March 2011   #1
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Erratic Idle

Hi, i have a Renault Megane 1.4 16 valve Fidji 52 plate and im sure this is a MK1 as its the older shape.
My car had an erratic idle and we put it on a computer ata garage and it only came up with a faulty Lambda sensor, so i changed the sensor and it still idles erratically, so the next thing i tryed was cleaning the idle control valve out which i was advised to do by a Renault dealership, that did not help so i changed the air filter too.

My car is still idling erratically, is there anything else i should check, bare in mind i have limited knowledge on car engines..... Much appreciate any help
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Old 2nd March 2011   #2
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Re: Erratic Idle

Aye, Mk1 Phase 2

Perhaps a coil or two? They are the most common failure on Renaults it appears and will cause erratic idling. However, there are many other things which could also cause the same symptoms!
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Old 2nd March 2011   #3
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Re: Erratic Idle

Thnks scatz i will try the coils, do you think i should change the spark plugs also and were would i locate the ignition coils, are they easy enough for an amature to replace?
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Old 2nd March 2011   #4
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Re: Erratic Idle

Coils are directly above the spark plugs, you need to pull them off the plugs to remove the plugs so you can't miss them

You may as well check the spark plugs whilst you are there to see if they give any clue as to which cylinder may be the problem....if indeed it is the problem! Check the gap and condition obviously!

Another 'quick' check is to pull each coil off (or at least unplug the electrical connection to the coil) one at a time to see if there is any change to the engine! If you pull a good one then you should get a miss fire, if you pull a bad one then you'll probably notice no change at all to the engine note/firing! Don't leave anything unplugged whilst the engines running for too long as you may cause damage
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Old 2nd March 2011   #5
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Re: Erratic Idle

I will try that tonight and let you know the outcome tommorow, thanks for the help
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