ive got a 1992 big turbo escort cosworth, from cold it starts then stops and does this about 3 to 4 times then it bursts into life and keeps running as it should!! with no probs there after!! when its warm it will start every time on the button without fail!! but if i leave it for a few hours i get the same start stop problem???? can any 1 help please?? its running stage 3 rs 500 intercooler brand new hybrid turbo ect... all sensors are new and just recently had a uprated fuel pump!!

 

Has it ever been good? In other words, could this be a setup problem?
If it has started correctly when cold, check wiring since the sensors are new.
Especially check ecu connector and ecu. I have seen ecu's with corrosion.

 

yeh it used to be ok !!!! is it possible for injectors to be faulty???? someone said that injectors mite not be spraying right?
ecu is ok ive already replaced dodgy connectors!!

 

Anything is possible.
Remove injector rail completely and have somebody start the engine. Then you can see the spray pattern. Put something under it to catch the fuel. However, in my opinion this is not likely as the engine starts and runs o.k. when warm.
Have you measured fuel pressure? How old is the fuel filter?
Have you ran the fuel tank completely empty lately?
Can you measure voltage of coolant and intake air temperature with ignition on, engine off when cold? (Backprobe at sensor or ecu connector or use breakout box).
And the same for the map-sensor signal?

 

fuel filters new and ive never ran it out of fuel!! but i will check the supply to te sensors you said, thanks oh and how do i know what the measurements should be at the plugs????? is it ohms or volts or????

 

With ignition on and everything connected you are measuring volts.
With connectors off you should measure ohms.
But I find that volts are more accurate and can also show a problem in the 5V circuit from the ecu.
You can find values for sensors here: http://www.bigturbo.co.uk/main4.htm