I have a Renault Megane 1.4 16v on a 04 plate, the engine revs itself from normal tick over speed to approx. 2000 revs. The garage have fitted a new ECU and re mapped it, throtle body, potentiometer on throtle,timing belt and sensor. They still can't fix it, have you any ideas.

if they put after market enginemounts-they dont work cause the rubbrs to hard --u need original--ask um aboutit

My 05 1.6 renault megane struggles to start in th morning and once it does fire up you hav to rev it to ensure it wont cut out. The car then splutters and judders a bit till its warm then it tend to run ok. but keeps on switching off at the robots when i stop please what could it be

sounds like its sucking in to much air at inlet manifold have it looked at

i had the same problem it was the mass air box its a thing that fits into the air intake after the air filter costs about £100 new from euro parts less from a car junk yard and you can fit yourself in about 1 hour or less, you have to remove air filter and engine cover and at the back you will see a pipe about 50mm dia with a plug going into it unplug this and remove circlips fit new part reconnect the plug and circlips and car should run fine refit cover and filter this is also the part problem when your car will not rev same on citroens and other french cars

Possible accesory power relay staying on due to an internal fault. It is above the fuses in the glovebox. Try sitting in the car, locking it then giving the relay a tap

try cleaning the petrol cap. it breaths round the key hole. i boiled mine. sometimes if there is not enough air in the tank. pure fule goes into the carb. and makes the car race. take fule cap and boil it in water. you can use steradent in cold water if you prefer. muck gets stuck in them.
liz.

it's normal because as you disconnect each one the engine will run rough because your causing that cylinder not to fire which put stress on the others don't do this it can create other problems. hope this help

hi sarah your problem is related to a speedometer sensor switch located on the gearbox its an electrical speedo on the megans, its fairly handy to replace, and if you were to go into any renault garage and purchase the part by giving the year make and model any garage will fit this within 10 min cheeper than renault dealership , goodluck

famous froggy electrics again ,renault garage to get ECU sorted ,buy a new car its cheaper than paying garage

Check fuses because the one that controls ciggarette lighter can often blow and this can be a sympton of that,could be loose. Looks like a bad connection from one of the speed sensors which control the abs, do you get abs light stay on. Could be wiring under the bonnet,check all visible wiring too. Failing them it`ll have to be an auto electrician.