Frontera start problem!!!!

[brightsparx]

 :'(  hiya all newbie from glasgow, i bought a p reg frontera and have a problrm starting from cold, turn the key the car will start straight away, will idle for a short time then cuts out, turn the key again it starts straight away and does the same thing, this is constant eventually it will start and run great all day, if i stop the car for a short time it will start again and be fine, if i leave it for a period of time then i have the same problem starting it again, i have changed various parts air flow mtr, idle control valve, crank sensor, ect any advise would be appreciated, thanx all

[Drift]

What engine is it?

[brightsparx]

hi ste its a 2.0 ltr sport petrol

[brightsparx]

to be a little mote acurate, i have replaced just about all the sensors, no luck i tryed bypassing the feuel pump relay so it had a permenent feed from the ignition, the pump works fine now when i start the car it idles for a few mins then ther is something attempting to cut the enging off, the engine dies then revs then dies and so on this can happen for 5 - 10 mins befor its drivable, any idea's? could it be the imobiliser trying to shut the engine off?

[Drift]

Other than the fuel pump rely breaking down, I would suggest the lamba  sensor  is giving false readings when cold, this sends signals to the ecu to control the air fuel mixture, located on the exhaust down pipe to the right of the engine as you look at it.