Higher revs when engine warm, valver

[theweekendhaslanded]

Hello, can anyone help?? When the engine is cold the revs are fine. When the engine gets warmer the revs are higher, around 1300rpm. Its just started to do this, can anyone tell me what the problem may be or what to check etc. Regards, Alan

[VIPERONE]

high revs are 90% speedoemeter cable related...due to the sensor on the failing.

[theweekendhaslanded]

that makes sense, I had the clocks out to replace some bulbs!! Can I do anything to fix it??

[Craig]

as said. road speed sensor needs earthing no doubt! shares stereo earth, or u can earth it directly off the plug behind the clocks!