My 1992 240 has developed a rhyming idle (speeds up and slows down in a rhyming manner). This has been going on for a couple of weeks and is almost to the point where the engine will no longer run.
Any and all thoughts and advice will be appreciated.
Thanks!
-- Frank :-)
Check to see if any vacuum hoses have fallen off or cracked, this is the most common cause of that problem.
If the car has a mass air flow sensor(located on the intake tube) try tapping on it with the handle of a screww driver. If the idle levels the sensor is bad. Or you could be looking at a bad Idle air valve. Agian try tapping on the valve and see what happens. It probalby wouldn't hurt to clean the throttle body too.
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