ok lads my 1989 2wd sapphire cosworth wont stay running.it will start up and idle fine at first then after about 2 minutes it will hunt up to 2000rpm and stay for 3 seconds and then back to normal idle,then after 10 minutes or so of sitting fine on idle it will cut out and wont start back up unless i leave it for 5 minutes or so.

it has my heaed all over the place i have cleaned out the throttle boddie and idle control valve and mad sure all the vacums are in the right places.

any ideas on what it could be ?

 

water temp sensor, it might not be turning off the cold start, and it is flooding itself

 

it only had a new water temp sensor about 3 months back but it sounds like it could be it alright.

cheers

 

1,make sure the 2 wires in the connector are actually making a connection to the coolant temp sensor! 2, try another map sensor m8.

 

When was the fuel filter last changed?

I would suspect the MAP sensor the fact the idle speed can rise means ECU is recieving input from someone to raise the idle speed, if CTS is open circuit it typically floods and does not start at all as it simulates a very cold condition. Sensor conditions can be checked by using the flash code diagnostics, Easily made with a 12V LED or LED and 670~ - 1000~ resistor, if you want to do this and need any more info with this let me know and I will tell you how to set it up, quite good although a sensor fault will only show you if it is open or closed circuit.

Martin

 

I'd check your tps, then the hot co.
tabetha