How to adjust idle speed of Honda Concerto 1.4auto?

This car was made in U.K. but found that its a common problem with Concerto. Tried turning the screw under carb. but didn't help.
its running at 15000RPM at idle. Please help..

Answers:
Some fuel injected Hondas have a problem that when they idle, the car goes from about 700rpm up to about 1500 rpm and keep hunting up and down at idle when warm. This is a relatively easy problem to fix as its caused by the idle control valve sticking. It needs dismantled and cleaned. Also check the vacuum piping around the carburettor or injection system for cracks or leaks.
15000 at idle. which means the cable is snagged and not closing the throttle butterfly. or do you mean 1500. its a bit high, but automatics tend to need a few more revs. (so when you put it into drive the engine doesnt cut out)

i suggest you phone your honda dealer and ask

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