replaced camshaft sensor, coil pack, high tension ignition lead and still trouble

[Maryclaire]

Hi everyone I'm new to this so please be gentle..my car ( renault megane '98 1.4 rt) started giving me trouble a few weeks ago...it wont start after lying idle overnight. the firsy time it broke down I called breakdown assist they said it could possibly be camshaft sensor, the mechanic i brought it to agreed the same so he replaced the sensor and bingo car was going again..next morning same problem it would not turn over, called the mechanic out again and he said replace coil pack so done that and replaced the high tension ignition lead as well after replacing these the car ran brilliantly...this morning tried to start it and again same problem it would n't turn over..my dad came over to have a look ..he pressed down the excelerator and the clutche pedal at the same time as turning the key in the ignition and after a few splutters and revs the bugger started up..i'm delighted that it is running today but uncertain about whether it will start tomorrow!! has anyone any suggestions as to what to try next? my heads wrecked buying parts..many thanks for any help..

	Ignition Coils Ignition Coils An ignition coil (also called a spark coil) is an induction coil in an automobile's ignition system which transforms a storage battery's 12 volts to the thousands of volts needed to spark the spark plugs. This specific form of the autotransformer, together with the contact breaker, converts low voltage from a battery into the high voltage required by spark plugs in an internal combustion engine. In older vehicles a single (large) coil would serve all the spark plugs via the ignition distributor. In modern systems, the distributor is omitted and ignition is instead electronically controlled. Much smaller coils are used with one coil for each spark plug or one coil serving two spark plugs (so two coils in a four-cylinder car). These coils may be remote-mounted or they may be placed on top of the spark plug (coil-on-plug or Direct Ignition). Where one coil serves two spark plugs (in two cylinders), it is through the "wasted spark" system. In this arrangement the coil generates two sparks per cycle to both the cylinders. The fuel in the cylinder that is nearing the end of its compression stroke is ignited, whereas the spark in its companion that is nearing the end of its exhaust stroke has no effect. The wasted spark system is more reliable than a single coil system with a distributor and cheaper than coil-on-plug. Where the coils are remote mounted they may all be contained in a single moulded block with multiple high-tension terminals. This is commonly called a coil-pack.

[Maryclaire]

please anyone if I replaced inlet air temp sensor would this help? I could read the posts for ever and still not have a clue

[cockers]

hi , from reading the posts the car does not turn over when the fault happens ?
if so get the starter motor solenid wire terminal relaced. or it may be the stater itself. your mechanic may have already checked this ?

[Maryclaire]

Hi cockers, thanks very much for replying to my post
sorry if i messed up in explaining clearly... the ignition is turning but does n't seem to make the connection to the sparkplug..hope I'm making sense if it were the starting motor would n't it just make a clicking noise? thanks for your time and patience

[Liam McGurk]

Hi,
Have you or your mechanic tried to clean the flywheel sensor situated on top of the gearbox. If not remove and clean you could also check the resistance should be approx 250 ohms. This also may help, have you changed the exhaust silencer? or checked to see if the baffles have failed or partially blocking.
Hope this helps you, Liam