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JC's_DIY
Приєднався 26 чер 2016
Lexus GS300 (2002) Catalytic Converter and Exhaust Manifold Replacement
Error codes P0420 and P0430 suggest the catalytic converter is going bad. In states like Texas that use the vehicle computer error codes for emissions testing, a vehicle presenting these codes with a check engine light (MIL) are sure to fail. This is an expensive repair for a Lexus, so it is definitely cheaper to do it yourself. This videos shows how to replace the entire exhaust manifold with the catalytic converters.
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Does anyone know which sensor it plugged into the exaust at 9:36 you can see it on the left side of the screen connected into the pipe
Would bad cats cause a gs300 2003 Lexus not to start?
It's unlikely that your cats would stop the engine from starting. Certainly, a completely clogged exhaust could prevent the car from starting, but it's unlikely that the cats are completely clogged. I would definitely check for other trouble codes to see if they can provide a clue for why the car won't start. The car will run with P0420 or P0430 codes.
@@JohnPColbert I just bought the car the other night it’s been starting fine. It would hesitate a little bit from a stop and if I gave it a bunch of gas but besides that it ran smooth. Now it doesn’t wanna turn over. I got it starting after I unplugged the mass airflow sensor, it ran rough then died after a few seconds, I’m on my way as we speak right now to get a scan tool. I’ll update you.
@@piffy.4532 Please check the intake resonator. It is the part of the intake tube that sits between the Mass Airflow Sensor and the Throttle body. It's a black plastic box in a slight S curve shape with a metal heat shield on the bottom. It sits directly over the exhaust manifold. These resonators are notorious for cracking. It happened to me. A primary symptom is hesitation when starting from a stop. The crack lets air in after the MAF, which throws off the whole system. The resonator is very easy to remove, but be sure to actually remove it, because the cracks, even when they are large, are hard to see. This problem can cause misfires, hesitation, damage to your cats, and emissions trouble codes, so it would be good to give it a check. BTW - you can use some metal ducting tape to temporarily patch the crack until you can make a more permanent repair.
@@JohnPColbert I checked it this morning and it doesn’t have any cracks or holes. I’m starting to think it might be the fuel pump because when I would give it, gas would a heavy foot it would sputter, and then takeoff, but if I would ease into it it would dry fine and it died on me driving up my hill on my house so I’m gonna point all fingers to that because besides that it was running fine
you the goat
Dammm you did a great job. I have a black 2002 GS 300 I’ll pay you to fix mines let me know if you up for it you can shoot it for one of your videos
What was the initial bolt measurement? Under the car exhaust.?
if anyone wants a work around to getting a new cat, take the cats out, if theyre clogged, drill bit the inside out (technically catless now), then get o2 sensor extensions and u should be good.
Thank you my man! I’m doing this tomorrow and this definitely is going to save me some time!
Are these dormans
This is super easy compared to most cars wow
AWESOME. I'm about to do this on my 2004. I wish however that you hadn't skipped too much on the heat shield transfer. I'm hoping it won't be too difficult to do it. If anyone has a good video to figure out how to do it step by step, that'd be great
Thanks So Much for all the explanations, they are so usefull
Where did you buy this?
Very helpful but I had to shift the engine a bit on the Is300 to get the old one out and the new one in. Used the rolling jack with a block of wood on the oil pan.
*You missed putting the anti ceasing goo on the o2 sensors* 😨
I live in Ny soni need a carb compliant but my question is you noticed any metal shavings inside the runner. I see this videos 4 years old but if you could answer I'd appreciate it.
2jz
Hey bro how’s the catalytic converters holding?
They're holding on. I must add that I was lucky to find, shortly after this repair, that my resonator box had cracked, which was probably the cause of the cats going bad in the first place. It turns out that these cars have problems with the resonator boxes cracking, which allows air into the system after the mass airflow sensor. This leak throws the air/fuel mixture off that causes problems for the cats. In my case, the crack was about 6 inches long under the metal heat shield at the bottom rear of the box where it couldn't be seen unless you pulled it out and inspected it. I wonder if I had noticed that before the original cats failed, if they would still be on the car. No way to know, but it makes sense to check the resonator box.
@@jcs_diy26 thank you so much for the response! I bought a gs300 1998 with 114k miles for 1.5k pretty clean but only problem is they took the catalytic converters out before i noticed. I was just wondering what is a good company that will last me. I appreciate your help!
1999 Lexus G300 with over 300k miles. Noticing power lost on performance and it fails smog test. How reliable are the aftermarket catalytic converters? OEM are impossible to find and some are charging like 8,000$ on Offerup. Thanks for sharing the Gospel!
Can i change the manifold gasket without removing the whole unit
Will this work for a 2003 Lexus gs 300 ?
Thanks man, this is a HuGE help for me. Much appreciate the breakdown! Awesome job, smart, easy to follow, just the needed info and helpful tips. You are the man!
There’s a rear exhaust CAT on these cars too, does that have to be replaced too?
Hi Mark. If the front cats broke apart, then the cat material will clog up that rear cat. That can cause a significant reduction in performance. If you're just dealing with the trouble codes and the front cats look fine, then you don't have to change out the rear cat. If cat material is breaking apart, you will hear it rattling when you shake the pipe (off the car of course) and you may even be able to shake some material out of the pipe. In that case, it would be wise to replace the rear cat. The O2 sensors that are reporting the trouble codes are placed in front of the rear cat, so that cat converter has no bearing on the 0420 trouble code. I hope that helps.
I was not familiar with the Lexus and that totally makes sense and answers my question. Thank you so much for your insight with dealing with these cars.
@@ImpalaSS08 No worries. Glad I could help. I hope your repair goes perfectly. Remember to check the resonator box for cracks. That may be what lead up to the cat failure.
Will do. Thanks again.
Im not very mechanically inclined so I was wondering if a rookie could do this? I have codes po420.po430 and po441. Bought the car for 1400 knew I would have 2 do some work on it. So I'm thinking that I should try doing his myself instead of taking it 2 a mechanic and having him charge me an arm and a leg.
Well, that's a tough question to answer, but what I would say is that if you are willing to give it a go, I think you can do it. The only challenging part of this was switching out the heat shields, but that is not required. Just make sure you have a foot-pounds torque wrench so you can properly torque the exhaust manifold bolts. Also, just be sure that you really support the car well before you climb underneath. If you don't have jack stands, maybe get some of those ramp things that you drive onto. On the other hand, if you choose a local mechanic, having them swap the manifolds would not cost too much, if you source the manifold yourself. Whichever route you choose, I wish you the best.
You are so good.. I'm frustrated with my 2004 Lexus GS. Everything we try we can't get the. Check engine light off. It keep failing emissions we replaced what the code said was wrong still the light keeps coming on. We payed 1500+ dollars already trying to fix this car. Ugggg🤦🏾 this is my third Lexus I love them but I'm so frustrated.. All the mechanics we take her to said there is nothing else wrong. They refuse to charge us.. Anyone have a clue as to what might be going on?
Perhaps you could share the trouble codes you are getting. Also, be sure to check the intake resonator, it is easily overlooked by mechanics. It is the part of the intake tube that sits between the Mass Airflow Sensor and the Throttle body. It's black plastic, boxy, has a slight S curve, and has a metal heat shield on the bottom as it sits directly over the exhaust manifold. These resonators a notorious for cracking, and letting in air after the MAF, which throws off the whole system. The resonator is very easy to remove, but be sure to actually remove it, because the cracks, even when they are large, are hard to see. This problems can cause misfires, damage to your cats, and emissions trouble codes, so it would be good to give it a check.
Nicely done. I was able to follow and change out my Cat with your video.
That's fantastic. Thanks for sharing.
this is one of the best diy step by step tutorials i've seen on UA-cam. Thank you good sir!
Thank you for the kind words!
This guy has it down cold, no BS, every bit is helpful.
Yes sir good job. This will help me out a lot.
I’ve got a p430 code on my 2011 GS. Is that the front or the back manofold?
The P0430 code usually means that the O2 sensor downstream from the catalytic converter is not reading within specs. It's one or both of the front cats that is throwing this code.
Did this repair make the codes go away? Did the codes ever come back after repair?
Hi Ron. You will notice at the end of the video that I completed all the drive cycle tests which resulted in no trouble codes. The video also shows that the vehicle successful completed the state inspection. The problem has not yet resurfaced. So, this repair did work for me.
Hey bud! Great video! By any chance did you have to do anything specifically to get the new one to fit? I’ve gotten the old one out but seem to be having issues putting the new one in. (Own replacement)
Hi Niko, I missed this comment but still wanted to reply. I'm sure you have this sorted out already. I did not have any fitment problems with respect to the manifold lining up with the head and the exhaust pipe. I transferred the heat shields over, which wasn't easy because the new manifold wasn't designed for those heat shields, but the adjustments were to the heat shields and not to the new manifold.
Thank you so much master 👍
Very detailed thanks but I got a $5 fix for this issue. Just install O2 sensor spacer/defouler. Works 99% of time to pass emissions
yeah but these cars need cats replaced after a lot of miles, even with no code they start smelling like rotten eggs and can restrict the engine
my spacer didn't do shit lol
I neglected mine and now I may need the cat replaced good thing u got urs fixed in time
Mine was only $800.
Fuck a couple k
What penetrating solution do you use?
Hi there. I use the PB Catalyst penetrating fluid. Seems to work pretty well for me.
Where did you buy your cat? I need one for my 2002 Lexus IS300. I don’t have smog check due yet but I would like to start now and not be rushed.
At just about 47 seconds into the video there is a copy of the order receipt. I purchased this from Eastern.
JC's_DIY yeah these are not legal in California, thanks anyway!
@@TonyAlvar3z These might work: "MagnaFlow Direct Fit CARB Catalytic Converter 452843" They are twice the price as the 49-state versions, but they still better than dealer cost. Good luck with your search.
I'm wondering if the process for changing out the 06 GS 300 AWD exhaust manifold is the same. Does anyone know?
I am wondering this too, did you ever find out?
@@spardu1 should be the same. the 2jz-ge manifold in all equipped cars GS or IS are routed the same way.
One of the best DIY videos I have ever seen! Great job!
According to eastern and walker, you do not need the heatshields because the replacement converter is smaller in diameter than the factory once...…….great video.....thanks
Thanks for pointing that out Sam. That's a great point as making the heat shield fit is the hardest part of the job. I like having them on there just to keep the heat off the starter and some of the nearby wires, but it's nice to know that the pipes can be installed without the shields: the job is much easier that way.
Hey Sam, can you post a link to this statement? I hope this is true so I can leave the heat shields alone if I can't manage to transfer them
@@IS3000vato According to eastern and walker, you do not need the heatshields because the replacement converter is smaller in diameter than the factory once...…….great video.....thanks
@@JohnPColbert According to eastern and walker, you do not need the heatshields because the replacement converter is smaller in diameter than the factory once...…….great video.....thanks
I'm having no power issues when I drive my 03 Lex IS300 but I am getting the P0430 code. But I'm also getting the VSC and Trac Off light as well.
Trac light is a combo of things. I have the same thing now. Most likely its the O2 sensors bank 1 and 2 upstream. Go that route first if doesn't fix replace your vvti solenoid
I'm getting the same issue: have you found how fix I tryed everything can't afford to take too shop.
Are the manifold gaskets at the header metal multi layer gaskets? I ordered some and they are like 4 thin pieces of metal punched together
That sounds about right. The exhaust gaskets often have layers and sometimes metal rings around the exhaust ports. I don't recall exactly what the manifold gaskets looked like when I did the install, but at 10:36 on the video you can see the top of one of the gaskets. That might help.
Did you have to remove the 2 rear studs near the firewall to remove the manifold or was there enough room/clearance?
I was able to remove the manifold without removing the studs. As I recall, the manifold came out easily with just a bit a moving it around for clearance.
So if have p0430 and po420 just need to replace the exhaust manifold? Not the other rear cat? I’ve replaced o2 sensors, run lacquer thinner etc and I still have these f’in 🐱 codes. How much would a mechanic charge if I supplied the part?
I doubt changing the sensors fixed the problem for these codes, but the lacquer thinner may have helped. The codes will take a while to clear on their own, so you won't know if those efforts worked unless you clear the codes and go through the drive cycles. I cleared my codes manually and then drove the car through all the drive cycles to confirm the codes remained clear. If you supply the part, a mechanic could probably do it for around $500. It's important that they put the heat shields back on the new manifold, which may require a bit of fabrication: just a small amount of trimming. That's why I say $500. The manifold itself is a pretty easy job; however, it takes longer to get the heat shields transferred.
Will this header work in California?
According to the receipt. No. The invoice says No CA or NY. I hope there is another aftermarket header available that you can find for a reasonable price.
Are those gas shocks that hold the hood open stock?
Yes. Came with it... Still work too.
great vid. i loosened the exhaust bolts but my exhaust studs started coming out also is this something that i should replace.
Sorry for the late reply. I'm sure you figured this out already. When they come out, that's not so bad, it's when they break that your day gets ruined.
@@jcs_diy26 I need to replace my Exhaust manifolds and flex pipe on my '93 GS 300. Since my ride has 2 manifolds and 1 flex pipe (Before the Cat), should I connect both the flex pipe and 2 manifolds before installing them or install them 1 by 1 separately?
@@Joseph-jo6rm It is a bit hard to say exactly as I cannot visualize precisely how the flex coupling attaches to the manifold, how flexible it is, and whether it could be installed after the manifolds are mounted. I believe the most important thing on that install would be to ensure the manifolds mate properly to the heads. If you can connect the flex coupling before hand and still maneuver the manifolds easily, then you can probably connect it before hand. If you do, I would recommend connecting it loosely and then tightening it after torquing the manifold bolts.
@@JohnPColbert Great! Thanks John, I'll consider doing so.
I’m in Ca and the Lexus cats are $4,470.33.......crazy
No doubt. Great way to get you to trade in your car rather that fix it. Glad there are aftermarket cats available.
Common problem with these cars but they run forever 💯💯
Going through this exact same thing, hence why I'm here.
What brand catalytic converter did you buy
It's an Eastern brand. At about 44 seconds into the video, I show a copy of the invoice, which includes the part number.
Hi, is it required to replace the manifold gaskets when the manifold is replaced, can’t the old gaskets be used?
I would recommend always changing the manifold gaskets when you change the exhaust manifold. I imagine you could try the old ones, but you obviously risk having it leak. The old ones would probably work, but the gaskets are not excessively expensive; so, it's really best to just replace them.
Enjoyed your video, very thorough. One of the comments mentioned using a muffler shop to cut out the old converter and weld in a new one. Will that work? I'm looking for the cheapest option given the age of my car and an upcoming emissions test. Thanks for any guidance you can provide.
Yes. That will work. Not sure if you can get that done for less cost then replacing them as shown here, but you can see what I paid; so, use that info and see if you can get new cats welded in for less.
I cut the old ones out and fab in universal magna flow HM cats. Takes a lil bit but works every time. Love it when these come through my doors. Nice clip.
That's a great solution. Having the cats welded into the manifold makes replacing them a difficult job. Although, the cost savings of fabbing in a couple of universal cats makes the extra effort worthwhile.
I have an SC 430 in great shape, but I've noticed that when I really hit the gas, it just doesn't seem to be as fast as it did, I hear a faint almost rattle-like noise, and it puts off a sulfur/rotten egg smell. Is this what the problem is? If so will fixing it give me my power back?
Rotten eggs is a smell associated with Failing cats, so is a reduction in power. It would be a good idea to have a tech check the in and out temps of the cats to see how they are functioning.