Torque Shop

I'm driving a seven-year-old Japanese car. Every time I start the engine, the engine speed goes up to 2,000rpm. When I stop at a traffic light, the speed stays at 1,500rpm for about three seconds before lowering to about 950rpm. I tried switching the air-conditioning on and off, but it makes no difference. Why is this so and should I worry?

Idling engine speed is electronically controlled. It does not require any adjustment unless there is some modification, such as the installation of a special air filter.

Check the throttle cable to see if there is any obstruction. If there is none, the fault may be related to the throttle body.

Send your car to a workshop for a proper diagnosis.

AUTOMOBILE ASSOCIATION OF SINGAPORE

www.aas.com.sg

A version of this article appeared in the print edition of The Straits Times on February 20, 2016, with the headline '(No headline) - CTSHOP20'. Print Edition | Subscribe