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Each time I put gas in my 1999 Lexus RX300 it idles a little harder than normal but after a couple of minutes it goes back to normal idling.

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Run the fault codes as there may be a problem developing in the EVAP system

Posted on Apr 23, 2017

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I have a 98 Astro van and it will start just fine every morning and run idle just fine...I have it parked on a slight downhill slant, now I put in (R) and do not any problems..Now after backing into a...


The PO 300 is random cylinder misfires & I fail to see why
you would not have checked for codes & found that issue
and corrected it within days of getting any codes

It also sounds like you have a transmission oil leak & are low
on fluid

Aug 29, 2013 | 1999 Chevrolet Astro

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Hi I have Lexus Rx300 year 1999. The problem is, some time when I start the engine, I noticed that the RPM meter shows low and the car little viberate and engine stops. But if in-between I push...


REPLACE SPARK PLUGS AND WIRES AND CLEAN FUEL INJECTORS. SOUND LIKE FUEL INJECTORS LEAKING FOULING OUT SPARK PLUGS WHEN YOU TURN OFF ENGINE.WHEN YOU START CAR UP NEXT MORNING CYLINDERS MISFIRING SO BAD FROM FOUL PLUGS ENOUGH SHAKE ENGINE.WHEN ENGINE RUNS FOR FEW MINUTES THAT WILL BURN OFF FOUL SPARK PLUGS UNTIL ENGINE RUN NORMAL.

Sep 06, 2011 | 2000 Lexus RX 300

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1999 lexus rx300 4wd eng. light comes on, no power, rough idle hesitation cat converter cherry red. when computer reset runs ok for short time


Converter is ruined, as are the O2 Sensors

Now you have to fine out why

Rich Condition or Overheating,
Engine Misfires

Have fun !!

Feb 16, 2011 | 1999 Lexus RX 300

1 Answer

Engine does not have an increase in idle when the A/C is on 2001 RX300


does the ac itself go on and get cold? if not check your fuse panel(s) did it use to increase? is there an electric fan or a pair of fans where as one goes on when the ac goes on? check the fan relays. hope this helps

Jan 20, 2010 | 1999 Lexus RX 300

1 Answer

When in gear and stopped, it will idle low and sputter but when put in nuetral this goes away. What's the problem?


Most likely the vehicle needs a tune-up. When in drive there is torque applied to the engine. This causes the engine to work harder to maintain the idle RPM's. When it's placed in neutral this added strain is released.

Most of the time a complete tune-up (spark plugs, wires, air filter, distributor rotor if equipped, and fuel injector cleaner ran through a couple tanks of gas) will take care of this issue. If not it's a good idea to have the engine fault codes check just to be on the safe side.
Hope this helps.

Oct 16, 2009 | 1999 Chevrolet Silverado 1500

2 Answers

Lexus rx300 2002 starts and immediately stalls.


I have a 2001 Lexus RX300 with 120,000 miles on it and I know exactly what is wrong with this car. You either need a new a new Idle Air Control Valve (IACV) or you must clean the one you have with some throttle body cleaner. I cleaned mine a couple of years ago. They are usually good for about 80,000 miles and then they get dirty due to emission controls (smog being recirculated and reburned). The IACV is located near the trottle body on the underside. Check lexusownersclub.com and you will see specific instructions on how to clean this throttle body. It costs you a can of throttle body cleaner and some of your time and this condition will not occur again - I did it!

Jul 17, 2009 | 2001 Lexus RX 300

1 Answer

During driving the transmission switches to neutral (Lexus RX300)


Your tranny need to be repaired at once. The tranny is slipping. Some Lexus owners do have the similar problem including myself.

May 18, 2009 | 2002 Lexus RX 300

2 Answers

Trying to program remote key for 01 lexus rx300


Hi Are these instructions applicable to a 2006 RX300? I would be grateful for any help. Many thanks, Ben

Jan 25, 2009 | 2001 Lexus RX 300

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