lumpy when cold

[rocky65]

Had the car out today for the first time in a week.I had some running issues which I hoped I had sorted.I have fitted new plugs and leads but the problem is still there.The car starts first time then runs for about a minute then stops.starts again ok.When driven its very lumpy and juddery at mid range revs,when knocked down a gear its away then it starts again.If I release my foot from the exccelarator it pretty smooth,push a little and its back again.This only lasts until the car gets to temperature or around 10 mins after that its as smooth as silk.Is this a ignition problem, coil pack ect or a fuel problem, or is a sensor not working as it should.Any thoughts on this would be much appreciated

[philip600]

Hi, I had a similar issue when I replaced my O2 sensor with a pattern part on my S4s, I replaced this with the correct Lotus one & issue resolved, I also had an problem with the idle air control valve that would also cause similar symptoms however it could be a number of things. If you haven't already I would suggest you download Freescan or Espritmon which you can use to help diagnose any problems like this.
Phil.

[rocky65]

Also noticed a strong smell of fuel in the cabin today,so decided to investigate the vent pipe system.What I found was what you might call loose ends.2 ends of brittle pipe above the rear window and 1 end at the passenger side.At the drivers side more loose ends,no wonder I was getting a smell,non are connected at all.I can see I need to put a new balance pipe over the window from drivers side filler neck over to passenger side filler neck but I have another pipe at the drivers side coming out of the filler neck which assume should join to the another pipe that seems to be disappearing downwards.Does this pipe have a rollover valve somewhere up where I have not yet looked?.Can anyone supply a diagram of this or just give me some advice please, regards

[philip600]

Hi, the pipe that heads downwards goes to the charcoal canister located beneath the radiator expansion bottle, this pipe is also prone to cracking. There's a 'how to' guide over on Lotus Esprit World & if you join The Lotus Forums as a full member I think you can still download the parts manual which is invaluable for located components on your car.
Phil.