2000 Renault Megane Erratic idle

2000 RENAULT MEGANE
240,000 MILES • 4 CYL • 2WD • MANUAL
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MIKE HALL 2
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Engine starts fine, idle is a little high. After 10-15 mins idle speed becomes erratic, continuously changing from 700 rpm to 1800 rpm and dropping again repeating every couple of seconds - a bit like challenging the next door car!

The problem is intermittent - soemtimies happens, sometimes doesn't.

Engine perfromance is fine.

It has been doing this intermittently for a year or two the Renault people report that there is no fault code shown on their computer.

All filters, plugs, cam belt etc have been changed at recommended periods
Feb 1, 2010 at 11:28 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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