The idling speed is automatically sensed ....and set by the Air control valve
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these days when you buy new plugs from the shop, they are already set for you
The most common cause for an engine to die out, while idling, is the idle speed is set to low. You can adjust the idle speed with the fuel injector vital screw.
Depends what model Megane, Te 16v ones mostly had automaits adjusters that cannot be locked back and will probably require an extra set of handsd to line the belt up while the other person twists the belt tensioner to relase the pressure on the belt.Remember to have the belt fully lined up on all the right pulleys!
The idling speed could be set too low.
There are several things that could cause this. The first thing to investigate, though, is the idle speed your engine is set at. As with any engine, if the idle is set too low, the engine will not continue running.
the idle is controled by the computer you can set minimum air flow but have to have a scan tool if it is idling to low clean the throttle body of carbon
Idle speed set too high most likely. Also could be carbon deposits inside cylinder. There are a few other option, but the cheapest to check and fix is idle speed.
You dont you replace the timing control module
How do I re set the radio code
set the idle down on the carb
set it at o