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Re: spark plug life
Improperly gaped plug you cant just put them in from the box they need to be gapped for proper function
also your spark sleeve might have slipped down from factory install theres a tool the dealers use to bring out sleeve for sparky
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compression may be weak--residual fuel pressure cud be low--spark mite not be strong enough-inspect plug wires-coil-ignition module-distributer cap--timing belt may have slipped a notch--is battery at 12.6volts and cables tite--
Access is stupid on these. If you don\'t want to disturb the head then drop the whole front subframe and engine and do it on the floor. If its done more than 80-100 k miles then change the head gasket anyway. They are usually corroded internally by then. Flush and fit new antifreeze at the correct mix.
had similar issue but with laguna 2.0 IDE where there are 2 sensors at the end of the fuel rail left hand side of engine looking into engine bay from front of car, they both look like cylinders about 2 inches high with terminal points for wires on top, replacing the sensors resolved the issue but they were really expensive and only available from renault, i was able to run the car as long as i stayed below 4000 revs if i removed the lead from the top of one of the sensors. be aware if you do change the sensors yourself, do it a while after you have last used the car and engine is cool, as removal of sensor causes the pressurized fuel to come out at speed all over you. hope it helps
Before going into the fuel lines check for spark at the spark plugs. When there is no spark, the injectors won't squirt fuel into the cylinders but there will be pressure at the injector rail and the pump will work.
Run fault codes as the light may also refer to the engine having a fault.. When the CPU finds a sensor that is outside set parameters it will put on a light to let you know that something is wrong. With Renault it may be the service light meaning check the engine and not service the engine.
get it running m8 pull plug leads of one at a time with a pair of (rubber grip) plyers to stop u from getting a shock, might be worth loosening first this will tell you what cylinder your missfire is in check plug gap and resistence in ht lead if this isnt the problem u need the valve clearence checking for more info email me at firstname.lastname@example.org i will be happy to help u check the valve clearence!