Hi all my little car has never gone wrong before in the past but now she is starting to play up with a passion!

Cold morning she will start first time revs upto 1500 then drops to 1100 rpm, once she warms up she sits at 1000/1100 rpm.

driving is normal plenty of power etc, wont stall, doesnt cut out etc... BUT

sitting at lights she will over rev upto 2500/3000rpm for a second or two before dropping to normal idle, If im pulling up at lights for example and dip the clutch the revs increase again anywhere up to 3000rpm, for just a second before dropping. But if im driving along as normal and gear change from 3 to 4 etc, revs DROP for a split second.

Ive tried an ECU reset about five times now and still the same (i cant find appropriate fuse so just been disconnecting the battery) so i disconnected the VSS (triangle plug thing that sits in the gearbox) that works a treat except my speedo is electronic, so no vss no speedo.

so what i was wondering was do any of you know which wire controls the speedo? That way i can cut the ''offending'' wire until i can get a replacement part.

Ive tried googling but get no where. Ive spoken to Ford but they are INSISTING i bring the car in for diagnostic checks, yet when ive have done the code reading thing holding down odometer reset button and putting ignition onto position ii there are NO error codes. There is also no difference in fuel consumption either.

I dont want to start replacing part after part because i dont have money to throw at it, i have very limited knowledge of engines and im also disabled (spending time under a bonnet hurts a lot!)

thanks.

Edited by stephbrum on 30/10/2011 at 09:17