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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6 Suggested Answers

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mkv0525
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SOURCE: 1997 lexus will not stay idle

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

Posted on May 21, 2009

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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.

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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

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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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2 Answers

Why is there muffler noise?


Could be a loose element in the muffler that vibrates at certain engine RPM. Or a small hole in the muffler. Sometimes the problem is as simple as a loose clamp, either a clamp that holds the muffler to the chassis or a clamp that joins two exhaust pipes. A loose clamp can allow the muffler or pipe to vibrate against the frame. Clamps are cheap - a lot cheaper than a new muffler or exhaust system.

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It sounds like you have a new old car!!! Noises could be so many things, but since you mentioned you had a muffler replaced, my first suggestion would be the exhaust pipe or new muffler is too close to a frame or out of line. Put car up high enough to where you can roll all around the undercarriage. Start the car and let it idle while you roll around looking and listening, and you will have a 90% chance of isolating your annoying rattle. Good luck!

Mar 28, 2014 | Dodge Stratus Cars & Trucks

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Nocking sound


OK let's do a little check. with the car in a clear area and no kid's or anyone around the car get in and start the engine.Now do you hear the noise with the car sitting at an idle.Let's say yes then put your foot on the brake and put the car in gear do you hear the knock if so hold the brake secure make sure no one is in front of the car and apply the gas lightly if the noise stop's then you have a loose torque converter to flywheel the bolt's are not tight..Now if you hear the knock and it's high pitch metallic then chance's are it's a rod or lifter in the engine.If the noise is a thumping dull noise you have a bad crankshaft.My guess is the torque converter because you said the transmission was worked on and a lot of time's without Loctite and the proper tourque the converter bolt's will work loose.GOOD LUCK HOPE THIS HELP'S

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1 Answer

I have a 1999 Jeep Grand Cherokee full time AWD. The car idles fine and I am able to select gears smoothly but I hear a grinding noise when I put it into drive. The sound continues after completely...


Without the benefit of actually getting under there and looking/listening, the best I could offer is a guess. Neither your front or rear differentials can make noise when they are not turning. However, if you see either driveshaft turning when the Jeep is in gear and standing still, I'd suspect that you either have broken gears in the center section or a broken axle.
If the noise is coming from the transmission or transfer case, you will need to find out why. Internal noises from either generally require replacement or a rebuild regardless of the original cause.

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2 Answers

Knocking noise exact location


grab water pump with both hands and see if it wiggles if it does its bad.bearing is worn.

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1997 ford probe manual transmission problem. I was driving in 4th gear when all of a sudden the car felt like gears where griding. It didn't have the really lound noise as if you didn't put it fully in...


well we could just lie and tell you what you want to hear but that wont help you... did you smell anything when this happend, if you lost a spring in the clutch plate this is what could happen.. but im speculating at the moment with out seperating the engine and trani..
that is where i would start, dont put the trani in the grave befor you see if it has a heartbeat, check things out a little more before panicing.
try putting the clutch in and putting in gear as you strat the car see if it will go in gear, my gut says you may have a clutch problem but you need to test a bit more before i can say for sure...
good luck please post comments if you have more info for me to chew on.

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1988 buick century dies when put in gear


Sounds like the lock up torque convertor in the transmission is stuck in the engaged position.There is a sensor switch under the hood that can be temporarily unpluged but leaving it unplugged can ruin the transmission. Take it to a tranny shop.

Nov 25, 2008 | 1990 Buick Century

2 Answers

Terrible Front End noise


Good Day,
It would make sense that it is suspension related as it does not make noise at idle but going down the road it does. I would lean towards it being a bad wheel bearing. Does it sound like it's coming from one side or the other? Also how many miles on the car? Does it get louder when the wheels are turning?

You can check the bearing easily by jacking up that wheel and moving it side to side and up down checking for play, a little bit of play is normal.

Hope this helps and Good Luck

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