GS400/430 intake manifold gaskets (Starter access) 1uz/2uz/3uz

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Hey guys here is a very useful video showing you how to replace the intake manifold gaskets on the Lexus GS400 and GS430. This is helpful to those that need to replace the starter on their vehicles as well because the stater is located underneath the intake manifold on these engines.
If you found this video useful and would like to see more car repair content, please don't forget to hit that subscribe button! Also if this video was helpful to you show you like it by hitting the like button! If you guys would like to see any specific vehicle repair item please feel free to send me a message or simply ask in any comment section on my videos! I am here to help everyone fix their cars so that you guys can save money by NOT going to the mechanic shop.

[@landshass2849]

2:15 Thanks for the good safety tip, removing the fues to run the fuel line dry.

[@josephmiller6129]

I got a code for knock sensors and manifold gaskets. thanks so much for this video, shows everything i needed to know

[@camdenbull1719]

Dude thanks. About to change my starter and it was hard to find a video on YT. Yours is by far the best one here.

[@allenonthespotyumacommunit2775]

I have to replace the knock sensors in my gs 430 and ran into your video, it's very informative and you answered all the questions I had! Thanks ✌️

[@HorribleHarry]

This is the best one so far. A lot less daunting looking now. Thank you.

[@HelpingHandAutoRepair]

You’re welcome

[@MissouriMatthew]

Hey man, I just wanted to let you know that I used your video to help change the starter in my LS 400 it was a life saver. I think I must have watched your video and rewound it like 50 times going step-by-step. I thought it was one of the best videos out there to help explain the process so hats off. Thank you for making the video, appreciate it.

[@HelpingHandAutoRepair]

Thanks for watching bro!

[@johnhlaird]

Great video, changed the starter on my 99 GS400 this weekend. Watched your video numerous times.

[@soulsurvivor420]

I'm surprised I didn't find it in the first few comments, but removing the coolant line is unnecessary if you're NOT doing the starter. If you're doing your knock sensors, the wiring harness to those, or your intake gaskets, you won't need to remove the coolant line, as you won't need to remove the bridge on the back of the starter where the coolant lines come in from the backside of the motor. I'm battling a knock sensor code problem in my '04 GS430, I've taken the intake apart and put it back together three god damn times now LOL! So trust me, you don't have to remove the throttle body or the bridge over the back of the starter to get the intake manifold off. I just used a short bungee cord to hold my throttle body to the side (drivers side) and out of my way when I was working on the intake. The only thing that gets in the way when removing the intake is the fuel line on the driver's side and the bracket with a plug on it on the passenger side. Take that bracket and just tuck it on the fuel rail or something so it'll come out with the intake manifold. You might need a helping hand to help swing that fuel line on the driver's side under the wiring harness though, that joker kept getting hung up on me when I was pulling the intake by myself, but I eventually made it work inch by inch, very gently LMAO!!

[@nitroidd]

thanks for the video, was able to replace my knock sensors for my GS430 and everything was on point. it was the first time i ever did anything this complex in my life. for my case, i didn't remove coolant hose on the throttle body, so didnt need to drain coolant. i also didnt remove the heater hoses or banjo fittings either, i disconnected the fuel line and left the banjo fittings attached to the manifold (i used 14mm and 19mm line wrenches so i didn't round the bolts [be careful of some fuel in the lines and some pressure as well]). it made things a bit harder to work around when pulling off the manifold and putting it back on, but i thought it have saved some time for my case. thanks again for everything!

[@Chin-dian]

Hey, I got slammed this week with a P0325 Knock sensor code. 2001 Gs430. Congratulations on fixing yours 👍. Can i ask you how long approximately did it take you and did you need a second person to help? Im debating whether I should pay my mechanic or do it myself. I’m a little handy myself, but not as skilled as a mechanic by any stretch.

[@nitroidd]

@@Chin-dian Hey there! It took me about 6 hrs to do, but I was really taking my time and ensuring I wasn't going to strip any bolts, crack any hoses, and so on. I did it myself without a second person lifting the manifold out but it was pretty tough and hope you're familiar with good deadlifting technique so you don't throw your back out. It did require specialized tools and planning like I mentioned above, and even then I also had a tough time. This is one of those that I would say you might take to a mechanic because of the complexity. I needed to do it myself because I was unemployed at the time and couldn't afford the labor

[@Chin-dian]

@@nitroidd okay. Thanks for responding. I appreciate your advice. 6 hours is actually very impressive for a regular person. But i hear what you say. It is complex for sure.

[@HelpingHandAutoRepair]

This job took me around 2 hours. Knock sensors are right under the manifold so add a little more time for that. Sorry just realized you asked this guy and not me. My apologies.

[@Chin-dian]

@@HelpingHandAutoRepair No apologies necessary. Im grateful that you posted this video. Wow , 2 hours is super fast for a job like this. I’m budgeting around 8 hours if i get the nerve to try it. But this tells me that it’s possible to do it yourself.

[@joshuahernandez2657]

Doing knock sensors on my GS430 wish me luck but your video is helping me

[@HelpingHandAutoRepair]

You got this 💪🏾

[@RabbitCarrots]

Great tutorial! I am 8 minutes in - and the instructions are on point! Slight differences in 1UZ vs 3UZ, but all good!

[@s0mething_sw33t]

I'm just getting into cars and I'm going to mod my sc430, but I need to fix it first. This is exactly one of the things I need to do so thankyou! Wish me luck I'm going to attempt work on the 3uz with my mechanic buddy. You're helping me learn and all that jazz. Much appreciated my guy

[@HelpingHandAutoRepair]

All good, you’re on the right trAck for sure. Maintenance first, modifying second. Most people do it backwards.

[@s0mething_sw33t]

it was succesful! time to do valve cover gaskets, replace the radiator, power steering hoses, and the timing belt. end me. still need the knock sensor too, should've done it with the intake but whatever

[@effortlessproductions]

Great instructions! Thank you for making this video. The GS community greatly appreciates it!

[@HelpingHandAutoRepair]

Thanks.

[@RabbitCarrots]

Agreed!

[@boogatikasino9978]

Aye bro you just saved me a lot of time and money thank you 🙏🏼

[@HelpingHandAutoRepair]

No problem

[@alexguzman1928]

thank you seen a lot of video and this one helps a lot very clear footage and helpful information

[@boogatikasino9978]

Learned a lot from this

[@arneldayawonabad5417]

thanks for the video help me to replace my starter motor (gs430)

[@ncmaximaguy6267]

Awesome video.

[@aveon9646]

I gotta ls 430 gud video

[@MrKickflip74]

Yo man shoutout to you for making a great video. Taking a break from the starter job on my 98 SC400. This video is great reassurance. Quick question tho. Can I break the main fuel line loose by the battery instead of the two banjos?! Saw it done in another video

[@HelpingHandAutoRepair]

You should be able to. Either way will work. Whatever makes it easier for you. 👌🏽

[@unokim5452]

Did you add any rtv gasket seal for the intake manifold or just bolted it down? I’m planning to do the gasket and stater sometime this weekend.

[@HelpingHandAutoRepair]

No RTV. The gaskets seal perfectly as they are.

[@unokim5452]

@@HelpingHandAutoRepair good looks 🙏🏾

[@Avalon491]

1999 Lexus Ls400 V8 I have a P0171 running lean, I sprayed brake cleaner and found the leak behind the manifold where the starter is located. I’m not 100% sure if it’s the intake manifold gasket or a hose since it’s behind the intake where the heater hose is and I can’t see back there. Do you believe I should still replace the intake gasket?

[@HelpingHandAutoRepair]

Heater hoses won’t cause lean codes. If there are any vacuum hoses behind the manifold, you can try spraying around those hoses and see if you have a leak there. It wouldn’t surprise me that your intake manifold gaskets are bad.

[@zanec3272]

One of the best gs4 mechanic content I’ve seen yet ??thank u very much !🙏🏽✍🏽🙏🏽.I do have a question ?what were the symptoms that gave u the reason they were bad?Any codes ?im curious kus i have a multiple misfire on bank 2 and tried everything to fix except this.. I got codes: P0300 P0302 P0304 P0306 P0308 I Change sparks plugs ,vvt solenoids,switch over coils,valve cover set ,cam sensor,fuel injectors are gud? Hesitates to run its full power..can feel a lil shaky in park..

[@HelpingHandAutoRepair]

When you pulled out the coil packs, were they soaked in oil or were the spark plugs covered in oil?

[@explorehunter]

@@HelpingHandAutoRepair What if they are soaked in oil?

[@HelpingHandAutoRepair]

You need to do the valve cover gaskets

[@zanec3272]

sparks plugs were covered a bit wit oil on bank 2, along wit 2 coils bein lightly oily .I then changed valve cover set . Including spark grommets.also replaced intake manifold gaskets still having same issue Nd codes . I recently notice sparks having jus a bit oil still not as much as the first time ..🤷🏽‍♂️ completely clue less at this point ..

[@HelpingHandAutoRepair]

What codes are you getting now?

[@Whois_Money]

I used this video to get to and replace a knock sensor in a Lexus sc430 I think a 3uz (pretty helpful if I might add) but upon reassembling everything I noticed that my banjo fittings are leaking fuel I haven’t been able to tighten them so that they stop. Do you have a suggestion?

[@HelpingHandAutoRepair]

Make sure you put the washer in place. Hopefully you didn’t cross thread them.

[@MissouriMatthew]

Is it leaking at the top where the set screw is on the fuel damper?

[@michaelbarnett2077]

Thanks for making the video! I have a 2000 Tundra with the 2UZ-FE, I have been getting a P0171 bank 1 too lean code, a slightly low rough idle when in gear and now the engine has started making this loud whistling/squealing sound at idle. If I rev the engine the noise stops for a second and when the engine returns to idle it comes back. The noise seems to start after the engine is warmed up. Do you think this could mean a bad intake manifold gasket?

[@HelpingHandAutoRepair]

It very well could be. However usually intake manifold gaskets leak while cold and then seal a little better while warmed up. This isn’t to say that it couldn’t happen. A quick way to test for intake leaks or in the case of these cars also is fuel injector o rings. Get some carb cleaner, spray it around the base of the intake manifold and around where the injectors are seated while the engine is running. This is how I found where the leak was coming from on this engine. It was a combination of bad intake manifold gaskets and a bad set of injector o rings on one cylinder (I replaced them all) If the engine stumbles or starts idling worse wherever you spray it at, you have found the vacuum leak.

[@michaelbarnett2077]

@@HelpingHandAutoRepair Thank you for the reply! I am going to dig in and replace the intake gasket and check out the injector o-rings while I'm in there.

[@HelpingHandAutoRepair]

Well if you want to save yourself some time, you could try spraying carb cleaner around both sides of the intake like I stated above. If nothing changes, then start spraying other possible vacuum leak sources. Like the intake tubes, vacuum lines etc.. any AFTER the mass airflow sensor. Since you have a lean code, it doesn’t necessarily always mean intake Manifold gaskets (although it’s likely) it can also be a slow responding upstream o2 sensor.

[@michaelbarnett2077]

@@HelpingHandAutoRepair I really appreciate you replying. I will do that with the carb cleaner. It's the LOUD whistling sound that is hard to pinpoint that is there at idle but goes away as soon as the throttle is opened, which makes me think of a vacuum leak. I have inspected all the vacuum hoses closely and replaced the PCV valve. The intake manifold gasket has that black plastic spacer thing with two gaskets either side and I can visually see that it is cracked in one location where there is a bolt, the previous owner has been in to do the starter before, so I'm thinking he used a cheap gasket. I have OEM Toyota gaskets to go in. The injector o-rings all look dry rotted as well, so its probably time for that.

[@michaelbarnett2077]

@@HelpingHandAutoRepair Turns out it was the intake manifold gasket. I keep in contact with the previous owner, and he had taken the intake off to change the starter and used ACdelco gaskets when he put it back on, one of these had failed and cracked in at least 3 places around one of the cylinders. I did do the carb cleaner, and it did confirm around the cylinder that the gasket was cracked in multiple places. The job is much much easier on a Tundra than the car you were working on! I didn't have to drain coolant or undo any coolant lines. I unbolted the throttle body and left it in the car instead of taking it out with the intake manifold. I used genuine Toyota gaskets.

[@joshjohnson8571]

Hey! If these gaskets are bad, that could be causing a vacuum leak which could cause a lowerish idle and an audible sucking noise while the car is running, right?

[@HelpingHandAutoRepair]

It’s possible yes. Fast and easy way to check that is with some brake cleaner. On this car you could hear a pretty loud intake vacuum leak towards the back of the intake. So I sprayed some brake cleaner back at the base of the intake manifold and sure enough the idle stumbled (indicating a vacuum leak) every single time I sprayed it there.

[@Ghost-Of-Kyiv-]

I'll buy the entire stock intake with the box and tube if your selling and putting an aftermarket in

[@HelpingHandAutoRepair]

What?

[@Ghost-Of-Kyiv-]

@@HelpingHandAutoRepair the tube coming out of the throttle body connecting to the air box with the filter, the intake setup, I would buy the stock whole setup off you mine came with aftermarket k&n Cai and I wanted to go stock...

[@HelpingHandAutoRepair]

Oh. Sorry this isn’t my car. A customer’s car.

[@Ghost-Of-Kyiv-]

@@HelpingHandAutoRepair thank u sir

[@lukeaintlow]

What symptoms were u having

[@HelpingHandAutoRepair]

Lean codes.

[@SonicMallard]

put my whole body weight into the fuel line and it didn’t even budge.

[@carl123456able]

Bout to buy an ls400 for 600$ all it needs is a starter and battery

[@HelpingHandAutoRepair]

Well with this video you can access the starter.

[@HelpingHandAutoRepair]

Also. Check the mileage for the last time the timing belt and water pump were done. That’s a big job also.