Bad Idle

[wayneyboy]

hi im new hear i have a is200 i replaced the csm belt and water pump when i got it bk it was idleing at3k. changed the throtle body for a second hand one but am still haveing same prb my eml and trc lights sre on could any one help?

[true blue]

Hi my advice would be to get the codes read first ,as it is all guesswork at the moment .An independent dealer or lexus will read them for approx £50 .Post the results on here and someone will help .was the EML light on before the work was carried out ?

[wayneyboy]

yes it was it had come on so i put it in garage as it was over due cambelt change but was driveing fine

[steve2006]

To clarify you took it to a garage for a cambelt and waterpump replacement and the idle speed was OK but when you got it back the idle was 3K?

First thing I would do is take it back and ask them to sort it free of charge.

[wayneyboy]

ive had lots of arguments with mr clucth and its been bk in there twice and they told me it was the throttle body so i got a second hand one had it done and it is still going up and down from normal to 3k

[clifton 94]

Check the switch in the air filter body make sure it is seated properly that's what mine was after cambelt change

[wayneyboy]

ok will do thsnks sorry where sbouts is it snd would that cause my trc light to flash? and would i need a mechanic to do this for me?

[ColinBarber]

Worth making sure the coolant temperature sensor is operating correctly. If it is in an airlock the engine will keep the idle speed high.

You do need to let the idle speed slowly adjust on the IS200. Drive the vehicle and at every junction come to a complete stop and let it rest for 20 seconds in neutral and repeat (many times) - the idle speed should slowly come down.

[clifton 94]

The switch is at the front of air box just make sure its pushed right in . As Colin said check that there are no air locks