3rd Gen Lexus GS Throttle Body & MAF Clean

[@NimbleLiving]

I have just done this self service earlier and now my car is idling at .680mph when turning on the A/C is barely up .710mph or less. It had a rough start about 5second then it calibrated itself. I gave it a ride and oh boy.. it was smoother than before. Thank you so so much for sharing this video and making everyone else life easier! Cheers!

[@patrickclaydon9313]

Another fantastic helpful video, thank you. My idle was off on 06 GS300 and ended up changing AC pump relay been fine since then cheers

[@DIYLifeSkills]

That's good to know. With over 110K miles, I'm sure I'll run into AC issues in the future. How many miles do you have on your GS300?

[@patrickclaydon9313]

@@DIYLifeSkills 135k so far!

[@NimbleLiving]

@@patrickclaydon9313 same!

[@costantineyoussif6679]

Great video brother, driving on auto mode and not S mode and the rpm reaches 5 and 6 that was super impressive, my 08 GS 350 the rpm barley hit the 3 , I should definitely clean this thing out 👍🏼 thanks again that was very helpful

[@gabegarcia7779]

Worked for me 2006 Lexus gs430 - cleaned the MAF sensor , cleaned the air housing compartment and intake tube with simple green or safe cleaning solution while I waited for my MAF cleaner to dry from spraying the sensor,. I had codes P0175 and P0172

[@DIYLifeSkills]

Nice work!

[@tayokarate]

Hi bro, I just got my 2005 GS 300 serviced, plugs and filters oil etc changed at a garage.I bought the car February 2024 city driving was 19.3 mpg and only varies in decimals as I only drive city and same route everyday.However about a month ago it dropped to 17.3 .Now I decided to get it serviced, now the mpg has become erratic.The day I got it back. It became unstable very dynamic and going down to 10 and 14 .I thought it was relearning so It eventually seemed to settle around 16.1 .I refueled to a full tank then it became unsteady again now reading 10.1. What could be wrong

[@DIYLifeSkills]

@tayokarate Do you have any check engine light?

[@DIYLifeSkills]

@tayokarate Do you have any check engine light? If you are not sure, auto part store can check them for you for free. Or you can just buy a cheap ODB 2 reader for under $20.

[@DIYLifeSkills]

@tayokarate If you are using lots of gas, you are probably running too lean - meaning gasoline mixture is too high compared to air. Ideally, it should be 14.7 (air to fuel) ratio. And MAF and Oxygen sensors determine how much air to feed in based on your RPM. If MAss Airflow Sensor or Throttle Body is dirty, it can throw off the air-fuel calculation. So clean both MAF and TB. Also check and replace engine air filter if it’s dirty. Dirty filter chocks the air supply. And be sure your air intake doesn’t have any cracked hose that is leaking air or extra air sneaks in.

[@deanvassil]

Replaced the coils and spark plugs on my 06 gs300 recently and engines no longer misfiring but the p0393 and p0348 codes (camshaft sensors high input) wont go away. Replaced both sensors with OEM parts and still refuse to go away. Cars idle is rough, after turning on it sits at about 400 rpms. Gonna try to clean the MAF sensor and throttle body tmrw and also spray all the electrical connectors with some electrical cleaner and see what that does. Any other advice or wisdom would be deeeeeeeeeeeeeeeeeply appreciated

[@DIYLifeSkills]

@@deanvassil How many miles and how long have you had the car? After replacing two sensors, are there any check engine codes?

[@DIYLifeSkills]

In modern cars air/vacuum leak can throw off all sorts of sensor values. You might consider doing vacuum leak test. All it takes is one cracked rubber hose to throw off the air to file mixture computes by sensors like MAd, TB, and oxygen sensor.

[@DIYLifeSkills]

Also, depending on how heavy the carbon build up is on your intake valves, some valves may not be fully closing completely. I did multiple videos on how to clean the intake valves if you check my playlist for GS300

[@costantineyoussif6679]

Great video man, Is that an AMG battery from interstate?? I was looking for one but they don’t have group 24 for my 08 GS350 , you mentioned something in the end of the video about Relearn idle !!? What is that

[@DIYLifeSkills]

I’ve replaced the battery since, but it was 5 year warranty Interstate battery that came with the car when I bought it used.

[@costantineyoussif6679]

@@DIYLifeSkills is it regular lead acid battery or amg ? Or you don’t know ? Because I heard amg battery only works best if the vehicle comes equipped with it from factory but not modified so I’m wondering how it is treating you !? Thanks anyway

[@DIYLifeSkills]

Pretty much all modern car’s computer and sensors are constantly detecting the air and fuel flow and adjusting the mixture rate for optimal fuel efficiency and performance. So the buttery flap that opens and closes controls how much air is being mixed with fuel. At idle, that flap is nearly closed to give more fuel to the piston for easier start, and for smooth idle. So the “idle relearn” is what car computes automatically to ensure smoothest idle after engine start. On some sensitive cars, especially European cars like BMW, Benz, VE, etc. after the throttle body and MAF sensor cleaning, car idles rough for minutes up to one hour until it calibrates the smooth idle point. So each car has unique steps to expedite the idle relearning manually immediately

[@DIYLifeSkills]

@@costantineyoussif6679 I replaced the battery with something different so I don’t know st this point. The 5 year warranty ran out so I had to buy a new one from Walmart

[@costantineyoussif6679]

@@DIYLifeSkills do you think 08 gs 350 will adjust all that automatically or do I have to do it manually? And thank you for the well detailed explanation👍🏼

[@partyguinness]

Is there really going to be any difference between the 2 cleaning sprays? I suspect it’s just a marketing ploy by the manufacturer.

[@DIYLifeSkills]

Two sprays are completely different. TB cleaner is a harsh chemical to melt carbon build up. MAF cleaner is gentle cleaner that dries fast for sensitive electronic parts. Don’t use TB cleaner on MAF as you could damage it. If you get the small can, Walmart sells both as a set for $8.50.

[@anwarnishthar1188]

Had rough idle and experience missing /. knocking at some speeds. Hence cleaned the throttle as you did. Later car was not starting for another 5hrs. Maybe I had sprayed excess fluid. There was no change after cleaning. Tried to relearn the thottle body reset from another video. However still the missing persists. Please advise any solutions

[@DIYLifeSkills]

Sorry, I missed this message earlier. Rarely, TB cleaning messes up car starting, unless TB was already going bad. By excess fluid, how much are we talking about? Some extra spray can only throw off the air-to-fuel mixture ratio and engine could briefly run rough and misfire, but as you drive, these symptoms should all disappear with 5-15 minutes of driving as all cleaning fluid is burned off. The master Toyota mechanic (Popular "Car Care Nut" KZbinr) says, Toyota and Lexus do not have relearn steps after TB cleaning, and that car's computer (ECU) self-learns the as you drive. About the only thing you should notice is a slightly higher RPM right after cleaning which gets corrected as ECU makes adjustment. How is the car now? If you are having issues, are you getting check engine light and (ODB II codes)?

[@BadTV1993]

sounds more like a ICV, spark plug or coil pack type of issue...just my guess

[@dortcharmy11]

Changed coils and spark plugs 2 years ago 07 es 350 now getting misfire on cylinder 2 and 4 but is chugging when driving

[@DIYLifeSkills]

Then it might not be plugs or coils. Is the engine slightly rough on cold start idle? Was there any recent service done to the engine area? When I used slightly cheaper denso plugs, mine misfired immediately and I ended up getting refund and got the matching plugs and misfire went away.

[@array8909]

Im getting codes P0102 and P0113 and I have a check VSC display on the dash. I have a lexus gs 460 2008 would that fix the check VSC?

[@DIYLifeSkills]

It could. But also make sure air filter is clean and the entire air passage way is clear. Also, make sure the air duct the MAF is sitting is not cracked and both ends are properly clamped down to not leak air. MAF on this car rarely goes bad so make sure the connector is not broken and it’s locking tightly and that respective MAF fuse is not blown.

[@array8909]

@@DIYLifeSkills do you have an instagram?

[@omoniyikaye]

I only drive on Drive mode I can’t be bother with S mode no point. I don’t drive I cruise that’s what you do with Lexus…Period❤️

[@arroyorichard2742]

Can my throttle pedal make my car idling while moving

[@DIYLifeSkills]

I don’t understand the question. When you drive and press on gas pedal, throttle plate opens up to allow more air to come in. Also, when you drive, the car is constantly making adjustment to the throttle plate opening, including idle speed.

[@Unplugged704]

Good video! I really hate those engine covers. Removed it on my Is350. 😂😂

[@DIYLifeSkills]

Agree. 1/2 the time mine is off also since I’m working on the car regularly. :-)

[@clintonpatterson2997]

How do you idle relearn?

[@DIYLifeSkills]

There is no formal idle relearn procedure for Lexus and Toyota. Throttle Body is constantly calibrating while the engine is running. You just drive normally after TB and MAF cleaning. If you spray too much into the TB, extra cleaning fluid can cause brief rough idle but it’ll settle down within minutes especially if you drive

[@theotter4200]

I heard a Lexus Tech say he puts the parking brake on and then put it in drive and the idle relearns quicker.

[@YZAK007]

I replaced the maf sensor and cleaned the throttle body. It idles better however the car stalls when coming to a stop now

[@DIYLifeSkills]

@@YZAK007 What’s your idle RPM once the engine warms up? Is your RPM stable once it warms up or is it radically changing once stopped at a light?

[@DIYLifeSkills]

@@YZAK007 do you have any check engine light on? For example, if your oxygen sensor is bad, that could also feed bad signal for air-fuel mixture and idle is unstable at idle. Same is true, if you have intake or exhaust manifold leak, dirty fuel injectors, worn spark plugs, etc.

[@YZAK007]

@@DIYLifeSkills turned out to be spark plugs

[@PuffySto]

my car stalls if i dont rev it. i plan on trying this then the spark plugs. did you just replace spark plugs? or you also did coils?

[@DIYLifeSkills]

@ Start with MAF and TB cleaning first and see it works. Also, try some fuel injector cleaners as well. These are easiest things to try. I’ve had Toyota/Lexus coils last well over 250K miles until I sold it. Driver side plug replacement is just a little bit tricky with the wiring harness. If you have bad plugs, often you’ll get misfire and check engine light.

[@nabilsawal929]

Hey, how do I clean the filter that’s glued on the top part of the air filter box?

[@DIYLifeSkills]

Huh? That’s not OEM. Did you install aftermarket part? Air filter will get dirty and they must be replaceable. Can you tell what’s brand name of that filter? In any case, you can use a shop vac to thoroughly vacuum the side of the filter where air goes in. Also vacuum the air filter housing as well.

[@George-ur8ow]

​@@DIYLifeSkillsi think he is talking about the carbon filter that is on top of the housing of the airbox on or 06 GS 300's. You can see it when you take off the airbox when changing the engine air filter. I removed mine (the carbon filter) a year ago, as it was very old and looked dirty. Needed to use a boxcutter to efficiently get to it, as it is not intended to be replaced or removed. If you are in a state w/inspections I'd keep it, but, if not, you can do so at your own risk. It is intended to supposed to filter pollutants out that escape from the intake after shutting your car off. After 17+ years in the car, though, I imagine it was either doing nothing or doing something perhaps harmful, so I took it out after doing some research on it.

[@DIYLifeSkills]

@@George-ur8ow Oh I get it now. Once rain stops here I’ll go have a look.

[@limbogt747]

I got my throttle body cleaned about 2 months ago do I still clean it since I'm going to clean the maf tomorrow?

[@DIYLifeSkills]

Not needed. They don’t get that dirty that quick.

[@limbogt747]

@@DIYLifeSkills so I finally cleaned the maf but I noticed the connection for the maf was really really dirty when I unplugged it, do I replace it or clean it?

[@DIYLifeSkills]

What part of the connection was dirty? Outside dirty you can clean. But inside shouldn’t be dirty. Is it some kind of corrosion build up? If so, it may not send proper voltage signal back to accurately control the TB plate opening.

[@DIYLifeSkills]

Though it’s for 2006 Lexis GS300, I do have a video on how to replace just the connector portion and keep the wiring harness.

[@limbogt747]

@@DIYLifeSkills in 3:10 when you disconnect the connection yours looks to be clean but mine is full of dust

[@FaceRipprMonkey]

Do you think having a k&n filter will make your check engine light go on csv?

[@DIYLifeSkills]

What’s CSV? MAF sensor detects amount of air and temperature of that’s coming in and automatically adjusts the air/fuel mixture. So as long as K&N filter doesn’t hinder proper airflow it wouldn’t cause check engine light. Which car do you have and what code are you getting? Also for did you swap out for cold intake K&N filter and by passed the entire air filter housing?

[@alb12345672]

kn filters have oil on them and make the MAF sensor dirty. Eventually you will get a lean code and and a check engine light. A dirty MAF is handled by the computer similar to a vacuum leak. More fuel is added to make the mixture burn properly to reduce emissions. This issue was known for 25 years already. If you clean the MAF, every 10K miles, it should be ok.

[@FaceRipprMonkey]

@@DIYLifeSkills I believe it means something like vehicle stability with the check engine light. The code says too lean so I believe it’s my MAF. Getting my k&n taken out and going back to stock. Thanks for responding

[@FaceRipprMonkey]

@@alb12345672 appreciate your information bro 😎

[@XTheJenovaProjectX]

He means VSC (variable stability control) he just got the acronym twisted. I just bought a 2008 GS350 AWD and I’m having similar issues. I have the P0420 and all the shops are telling me to get a new catalytic/manifold. But other shops tell me that it’s coming a source at the motor making the OBDII think it’s the CAT. I also have the VSC light and a check engine symbol. I’m hoping seafoam like your video shows, will help. I went through all this bullshit with my Prius. Carbon and oil build up in the throttle body, intake manifold, and EGR cooling system. So annoying. I thought Toyota was the best and I’ve had more problems and maintenance than any car I’ve owned. 😑

[@gee1363]

How do you get your temp to display on the odometer?

[@DIYLifeSkills]

I recall seeing the instruction in the manual. Let me see if I can find it tomorrow.

[@DIYLifeSkills]

Manual says "When you push the "DISP" switch with the engine switch on, another outside temperature display appears on the multi-information display" ...and it shows a picture of the odometer and temperature. However, I started the engine, and pushed DISP switch but no temp appears. I used to have it until I replaced the battery recently. I'll try it again and let you know....strange.

[@spiritedPILOT]

Just keep hitting the DISP button on the wheel till u get the temp display

[@tayokarate]

​@@spiritedPILOTexactly

[@DIYLifeSkills]

Yeah use the DISP on the steering wheel as it rotates through different displays. I usually keep mine at Miles left on gas.

[@joseCalderon1976]

Good stuff 👍. Subscribed

[@DIYLifeSkills]

Thsnks

[@joseCalderon1976]

@@DIYLifeSkills How's your MAF doing? I'm a little bit worried about spraying it like that. Even with the MAF cleaner 😅

[@DIYLifeSkills]

@@joseCalderon1976 Don’t use anything but MAF cleaner to not damage sensitive sensor. This is pretty basic stuff and you definitely don’t want to use brush or rag to clean it. Basically you are wetting the dust build up and force of the spray blows them away. Painless stuff. But be careful handling it to not touch the sensor and definitely do not drop or toss it. Handle with care.

[@chrisdas172]

Is it necessary to disconnect your battery

[@DIYLifeSkills]

To be honest, half the time I didn’t disconnect battery and it was just fine. I have updated video on cleaning the TB after removing it. Once you remove it, it gives you better access to the back side.

[@alb12345672]

I have a GS 350. Fords have a very similar setup too. They are even more fragile, there is no protection around the elements.

[@Optimus_1LE]

Is there a way to contact you ? I’m having issue with my car

[@DIYLifeSkills]

Hi Alexx, what problems are you having?

[@Optimus_1LE]

The car cuts power as soon as I apply gas I replaced maf and still nothing has new spark plugs aswell

[@DIYLifeSkills]

@@Optimus_1LE Be specific to what "cuts power" mean? Are you saying electrical power goes out, or engine dies? Are you getting any check engine light? What year, model, and how many miles?

[@Optimus_1LE]

@@DIYLifeSkills do you have a email I can send you videos to? It’s a 2006 gs300 170k miles

[@DIYLifeSkills]

@@Optimus_1LE I don't give out my email, but you can easily upload it to your KZbin channel.

[@awesomusmaximus3766]

I get another 1,000 rpm in sport mode 7,500 rpm

[@DIYLifeSkills]

You mean after the MAF and TB cleaning? Awesome.

[@awesomusmaximus3766]

@@DIYLifeSkills I just did a GDI clean there wasn't much build up at all I cleaned the MAF it was kind caked in crap ha ha Doing an Oil Change also today letting drain for an hour while the cleaner heat soaks

[@DIYLifeSkills]

@@awesomusmaximus3766 Good job, now repeat it every 20K miles or so to keep it in good shape.

[@awesomusmaximus3766]

@@DIYLifeSkills Wow so much smoke Just took it for a 10 min Drive

[@DIYLifeSkills]

@@awesomusmaximus3766 That’s a good sign as it’s burning off the cleaning solution and any loosened carbon build up.

[@paddy5141]

I cleaned was ok for 3 days and it’s bad idling again 🤷🏻‍♂️

[@DIYLifeSkills]

Lots of things can effect the idling... What year and how many miles do you have? When was the spark plug changed? And do you use fuel-injector cleaner regularly? How was the idle RPM prior to cleaning? What is the RPM range now when it idles "bad"? On cold start, it's normal to see above 1000 RPM for nearly a minute and then it should gradually come down. Mine idles smoothly and it's around 600 to 650 RPM.

[@paddy5141]

@@DIYLifeSkills Thanks for reply 👍🏻; It’s GS 300 it’s 2007 with nearly 200000km on it. I have done full service about 30k ago oil filters spark plugs battery etc (I’m changing oil regularly).., I don’t use injectors cleaner I only use fuel treatment “dipetane and when idling on neutral it’s ok when I put on D the idling arrow going up and down 800-650 shaking Al the car I tough it was the transmission problem but I watched your vid cleaned throttle and air flow sensor and was ok for few days and now is back again 🤷🏻‍♂️(maybe I need to clean butterfly better)…let me know what you think

[@DIYLifeSkills]

@@paddy5141 Are you the original owner? How long ago did the rough idling start? Does it idle smoothly on warm start? Does it eventually idle smoothly after getting the coolant to normal operating temperature level? Meaning… you’ve driven it and the engine is still warm?

[@DIYLifeSkills]

@@paddy5141 When I changed the spark plugs. I bought the slightly cheaper Denso Iridium plugs and this car was misfiring periodically and the gaps were off. I ended up returning them and getting the matching plugs and again I had to correct the gap setting on some of the plugs. Have you checked your ODB for any stores check engine light?

[@paddy5141]

@@DIYLifeSkills I’m a third owner and car wasn’t looked after properly …it’s only bad when worm…when cold it’s ok. It’s started bad idling after service. Spark plugs are denso recommended…. Also you made me thinking now I replied battery for slightly stronger, yausa but amps higher a bit…🙋🏻‍♂️

[@Goldenhordemilo]

i removed mine to clean it

[@DIYLifeSkills]

That's the best way to do it, especially for the back side.

[@Goldenhordemilo]

@@DIYLifeSkills there were two thick lines of carbon too