If I push the gas all the way to the floor why do the rpms go up to around 4000 and stays there

 

Welcome to CL.

Your question is very confusing. Instead of "rims", do you mean engine revs? And what does sTaylor mean?......(stay there)?

We also have a maintenance forum for questions like these.

https://www.clublexus.com/forums/maintenance-11/

 

 

I floor the car the rpms go up to 4 and stay what is causing this is need to replace my o2 sensors, it has a miss fire in cylinder 3 and a small exhaust leak if you know what's causing this to happen please help me

 

I can't necessarily give you a detailed answer, but, unless there is something wrong with a sensor or the computer in your engine, emission controls sometimes dictate that, when you push down on the gas pedal and suddenly release it, the engine RPMs don't necessarily drop immediately, but keep revving for a second or two, then drop back down slowly. That's because of the "spike" in emissions that formerly accompanied a suddenly-closed throttle. Also, most of the newer gas pedals do not have mechanical linkages, but operate on a "throttle by wire" system, whereby your foot-pressure on the gas pedal sends a signal to the engine's computers, and the computer regulates the amount of gas squirted into the cylinders through the injectors. A bad TPS (throttle-position-sensor) could mess at least part of that up.

 

 

Engines today are so complex that it could be any one of a number of things....I'm not enough of a Technician to list them all. Are you getting a lit-up Check-Engine light?

 

Yes. From the o2 sensors and misfire in cylinder 3

 

Maybe you activated Launch Control!! j/k I have no idea

 

You should really post this in a model specific forum and/or the maintenance forum where people will have a better idea how to help you.

 

sorry to hear. what year is your gs300? i can move it to the right section for further comments.

 

OK, when you get a code, then a specific test-procedure has to be followed.....that will be listed in the car's Service Manual.You don't just automatically replace the indicated part.

And, if you're getting a misfire, that's something you will want to get looked at right away. A raw, unburnt air-fuel mixture that is not getting lit off in the cylinder, but instead goes through the hot exhaust system and catalytic converter, is not a healthy situation, and could cause damage to the converter.

 

It's a 2002

 

I feel like you should be taking your car to a qualified mechanic.

 

Your vehicle is in what you call limp home mode. You need to correct the required repair for the misfire and O2 sensor before it would go away. You probably need a plug and O2 sensor, check your spark plugs also pay keen attention to #2.