Question about 1999 Lexus RX 300

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1999 Lexus RX300 Idle rough when out in gear

Car idelas fine until put in gear. Then idle is a bit rougher and I can hear more noise from under the car...sounds like a muffler going bad. Thoughts?

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  • kkalanik May 11, 2010

    Sounds like you may have more than 1 problem. May be an engine misfire and an exhaust leak.

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5 Suggested Answers

mkv0525
  • 358 Answers

SOURCE: 1997 lexus will not stay idle

most likly is the air idle controll valve.needs replaced.

Posted on May 21, 2009

  • 40 Answers

SOURCE: 96 lexus ls400. Car idles high and runs rough

It could be a idle air valve, a loose, unplugged or missing vacuum hose or a throttle position sensor.

Posted on Sep 17, 2009

  • 1 Answer

SOURCE: my 92 honda accord ex as a rough idle at stop and

Typically this a result of bad motor mounts, I had the same issue with my 92 honda accord, changing the side mounts and the strut up front resolved the issue. The Trans mount, behind the motor is the most difficult mount to change and requires you to unbolt the other mounts and roll the motor far enough forward to gain access to that mount, but once all 4 mounts are replaced your issue should be resolved

Posted on Apr 06, 2010

  • 1 Answer

SOURCE: 1999 gs300 shows code p1349 and the engine runs

Its a Oil Control Valve most likely. Get the valve. Its like 100 from Lexus. Mine did the exact same thing with that code. GS300

Posted on May 19, 2010

SOURCE: 1999 lexus rx300 4wd eng.

Converter is ruined, as are the O2 Sensors

Now you have to fine out why

Rich Condition or Overheating,
Engine Misfires

Have fun !!

Posted on Feb 16, 2011

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How do i fix this issue security light flashes even when key is inserted in the key lock


2001 lexus rx300 wont start security light blinking code b

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Oct 30, 2015 | 2001 Lexus RX 300

1 Answer

Car wont idle


There re few possibilities that can cause no idle issues.To troubleshoot the issue help links are provided below.Click the link below:---
Idle Problem? http://whatisbyme.blogspot.in/2012/05/2001toyota-corolla-idle-problem.html
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Idles rough and quits when gas pedal is pressed less? http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html-----------
Stumbling and stalling at idle after engine rebuild? http://schematicsdiagram.blogspot.in/2012/03/stumbling-and-stalling-at-idle-after.html

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Cooling fan Shuts OFF and Idle Drops? http://howtobyme.blogspot.in/2012/05/toyota-celica-cooling-fan-shuts-off-and.html

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Rough Idle and Vibration? http://whatisbyme.blogspot.in/2012/05/2006-ford-f150-rough-idle-and-vibration.html

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Steering Wheel Vibrates at Idle? http://whatisbyme.blogspot.in/2012/05/1993-toyota-corolla-steering-wheel.html

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Runs Fine But Idle Is Low? http://whatisbyme.blogspot.in/2012/05/2004-toyota-highlander-runs-fine-but.html

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Vehicle Will not hold Idle? http://whatisbyme.blogspot.in/2012/05/2003-lexus-es300-vehicle-will-not-hold.html

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Engine Idles Rough and Dies? http://whatisbyme.blogspot.in/2012/05/1994-lexus-es300-engine-idles-rough-and.html

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This will help.
Thanks.

Jul 17, 2012 | Cars & Trucks

1 Answer

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

1999 gs300 shows code p1349 and the engine runs really rough at idle , runs fine off idle


Its a Oil Control Valve most likely. Get the valve. Its like 100 from Lexus. Mine did the exact same thing with that code. GS300

May 19, 2010 | 1999 Lexus ES 300

1 Answer

My RX300 does not want to idle. I can manipulate


Possibly a failed 'idle air control.' Take it to one of the auto parts stores and ask them to do a (free) scan of your computer to check for possible stored error codes.

Oct 14, 2009 | 2000 Lexus RX 300

2 Answers

My 99 RX300 lexus doesn't start sometimes. Changed battery and was told alternator was good. I tried charging the new battery, but also jiggled the transmission, put the car in neutral then back to park...


Sounds like a loose connection on the starter or ignition circuit but more information is needed. When its not starting up, are there any noises from the engine bay? Have you checked for spark on the spark plugs? Are you getting error codes from the car's computer? Does the car idle 'weird'?

See if you can get a copy of the Haynes or Peterson's manual for your car.

Remember that its a Lexus, its going to cost money to fix.

Sep 15, 2009 | 1999 Lexus RX 300

3 Answers

I have a 2000 lexus rx 300. clicking arond or near center consul


the location and type of noise u hear is most likely coming from the electric blend door temperature control actuator.when they fail the ting gears inside make a clicking noise like this, the location you gave is dead on to where this part is located.

Aug 27, 2009 | 2000 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

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