1999 Lexus RX300: Engine idles low and stalls in morning?

The Engine idles very low while start up in the morning.Also a stalling is noticed.
But once the engine warms up is starts and runs fine.


In this types of problem there are several possible causes for low idle/stalling when engine is cold - low fuel pressure, vacuum leak, faulty coolant temperature sensor, faulty Throttle Position sensor, faulty mass air flow sensor, sticking throttle body throat plate.

To find out which of the above is the cause, you will need to leave the vehicle overnight with a shop so that they can test it with a diagnostic scanner when cranking the next morning and engine is cold. They wont be able to test it after having driven straight to them as the engine will be warmed up and nothing will show as wrong.

If you are going to do the testing, you will need to do it first thing before its being driven and will need a fuel pressure gage, a voltmeter and scan tool to test the above mentioned possible causes.

These details will help.
Thanks.

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Erratic idle on car?

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Very common problem,noticed by many car users.
Have you ever cleaned the automatic idle speed control valve and threottle butterfly? It may be your problem. Try the following to clean these parts.
To correct this problem Buy a can of throttle valve cleaner (it is made by CRC) from the local auto parts store, NEVER USE CARB CLEANING SPRAY, IT DESTROYS THE ANTI-STICK TEFLON COATING, spray it into the air intake through the throttle body of the engine until you have used about half the can, you will need to hold the idle up while you do this, it will try to stall, after this shut the engine down and disconnect the Negative (-) battery cable for 5 minutes. The intake is now clean, if you continue to have the idle speed control problems you may need to seek the help of a professional.

This basic details will help.

Thanks.

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