Hello,

I have a 99 RX 300 with 90,000 miles. While coming to a stop at a stop sign today the Check Engine light suddenly came on and the car began idling very rough. It almost died at the stop sign. As per the manual I checked the gas cap, and filled up with gas. Still the same thing.
Has anyone had a similar experince with their RX and if so, what was the deal?

Thanks,
Jon

 

pull up the codes....and i also sugest cleanin the tb

 

? Tb? Codes...?

 

When it happed to me, (your symptoms) it was one of the 02 sensors.

 

Go to an autozone and ask to use their OBDII scanner or better yet just buy one if you start running into codes.

If you search the forums, you will find about cleaning your MAF sensor and pulling either the negative battery cable or the EFI fuse in your fusebox.

I doubt its the gas cap.

Koolaidman is right in also cleaning out your throttle body...not hard to do with some carb cleaner and spraying (not streaming) a little water.

Do a search and you will find the post.

 

One of 3 things most likely...
Mass air meter, idle air control valve or air fuel sensor......I listed them from cheapest to most expensive....

 

I have had the same problem twice before.....Once it was the gas cap. AutoZone can reset your light and with a new cap it was fine. The other time it was the vacuum hose on the air filter. When the guys at the Jiffy Lube check the air filter the hose can come off easily. I always have the check it now. Both are easy and inexpensive. But get the error code first and check these things.

 

Check engine light is sort of mother of all warnings ... when the on board computer senses any thing (among hundreds of things it keeps track of) out of bound the warning indicator is lit up. Then preferrably you go to the dealer who hooks up the the obd [on board diagnostic] and deciphers the error code.

The above is not precise but in general a reasonable simplified explanation of "check engine light'.

salim

 

Sounds like bad ignition coil(s). My wife's RX300 had similar symptom, one of the ignition coil was bad, once replaced ... all is well.

But do as suggested by above posters, go to your local Autozone and ask for a OBDII read out, write down the code number and post here again. Otherwise, take it to the shop as soon as you can.

 

Forgot about this one, this goes bad very often as well....good catch

 

If the problem is indeed a bad ignition coil then this is a relatively cheap & quick fix.

 

first lets get the dtc before any one assums any thing

 

cleaning the throttle body

and getting codes aka dtc diag trouble code. a letter with a set of numbers helps us determin what the problem is with the car

 

If you get us the code we can go over it with you before you possibly waste money at a dealer.

 

Thanks for all of the help!!!!

It was in fact the coil for Spark Plug Number 5.
Replaced spark plugs and the coil on number 5, and all is well.

Thanks again for all of the help.
You guys are great.

Thanks,
Jon