I wish I would have joined this forum earlier, and learned that I could have gotten my stuff replaced due to the sulfer smell. It is obnoxious and has been since the day I bought my truck, brand new in 04.

On the other hand, I just had my local mechanic remove my cracked manifold, take it to a welder and re-install it. The tick is gone and it cost me less than half of the new parts alone.

I'm looking at getting an V8 here in the near future, any way to check for this? My best guess is to as one poster said, put it in reverse with foot on the brake and listen. There is no way to actually visually inspect this is there?

I tried to remove the heat shield on mine a few nights ago... I did finally get all the little bolts removed but then there was no room to actually remove the shield itself through the wheelwell... I was able to angle it down a little but it did not allow me to really see much of anything and it was a huge PITA quite honestly.

I am not sure I understand how the exhaust manifold can even be removed with the engine in the truck. I've replaced exhaust manifolds on domestic V8s before without a problem.... but this is nuts, there is just no room in there at all.

Make sure the motor hasn't been ran and just start it and listen for the tick if I give mine gas in neutral upon start up you can hear the tick clear as day.

On another note I am probably not even gonna bother having it fixed I am just worried about the manifolds getting warped after being welded and still having the tick afterwards.

Mine can really only be heard when the truck is cold and under load... loudest in the lower rpms around 2,000-3,000 or so.

I can hardly hear it inside the truck unless the windows are down, outside the truck is pretty noticeable when the truck is pulling away from me.

Just annoying...

wonder if you could just JB weld it? if you can find out where the crack is and get your digits in there.

it is frustrating a "toyota" has this issue. yes I am pro toyota, owned 6 4Runners so far.

Right now I am just living with it, until it sounds like a huge ****.

look at the illustration #1 is the manifold and converter as 1 assy. toyota even explained it to me when they changed it. they also changed #7 & #8 . the only part they did not change was from the muffler back. i wish i took pics after it was done. maybe my dealer changed more than they had to.

checked invoices here is that they changed
17410-50490 pipe assy exhaust
17450-50131 pipe assy exhaust
all new studs, nuts, gaskets
17510-50050 manifold assy
17140-50060 manifold assy
so they replaced both manifolds, y pipe assy and pipe from y-pipe to muffler assy.

and the database is because i work for an insurance company so i can look up most parts through it with pics.

Yeah you cant get any kind of access to that flange area without removing them.

Well I finally took it into the dealer. Told them I thought it might be a cracked exhaust manifold. On the way there on the freeway, I actually smelled the rotten eggs (aka sulfur) so I went ahead and told them this.

According to the tech though the noise is being caused by a bad Fuel Pulsation Dampener. My Fuel pump is also not holding pressure, so they are gonna replace both items. I personally talked to the tech to understand why the fuel pulsation dampener would cause the noise I hear. He assured my my exhaust manifolds are fine and the noise was being caused by the dampener.

From what I understood, too much or too little fuel might reach some of the injectors due to varying pressures. The dampeners keeps the line pressure the same adjusting for the pulsation from the injectors and the pump. So maybe the knocking is just the dampener itself or due to combustion issues for lack of or too much fuel???

They are also replacing the cats involved in the TSB bulletin due to the sulfur smell. The only thing I have to pay for is the dampener and the labor for that, the pump and cats are covered under the warranties.

Fingers crossed this dampener replacement will fix my knocking, otherwise, I'll be

Looks like you got "the hook up"! As you can see from my below receipt, I wasn't lucky enough to have all those parts changed out. Some of the parts match, but I didn't get the manifold changed like you. (I wish! And at least I wasn't "seeing things" when I thought I saw older pipe for the manifolds, joined with the brand new pipe for the cats, and then I think just before the muffler, back to the old pipe.

I just confirmed with my dealership that the TSB for sulfur smell only replaces the 2 lower cats downstream of the manifolds (which have their own cats).

So....no dice on getting my ticking noise taken care of for free though it would have been awesome!!! I have some busted knuckles and have only half the bolts off of my 05. Can't wait to see if i can get the other off without stripping or shearing the bolts. Now THAT would be a PITA to fix.

Quote just came in @ $993 for:
The right side manifold
gaskets
new studs and nuts

BUT, I still love Toyota and will always own one if this is the worse in the 15 years and 5 trucks with them.

Well this morning, I didn't hear any abnormal noises when I started it up and put it in gear. I was hearing it every single morning for the last 3 weeks. It was like clockwork, start it up, put in in gear and knock, knock, knock...

Like I mentioned before, Toyota did not replace my exhaust manifold, they told me over the phone the noise was cause by my Fuel Pulsation Dampener. Of course on the paperwork they wrote that the cause of the noise was from the fuel pump, so ??

They also replaced my lower two cats per the TSB so perhaps I did have an exhaust leak at the flange where the manifold hooked up to the lower pipe, and this fixed it and the fuel related parts was just to get some cash out of me? Who knows, but the noise it gone for at least this morning.

Things to check before assuming its the manifold,
1. Exhaust flange bolts where the manifold connects to the lower pipes.
2. Fuel Pulsation Dampener (this little guys is very accessible, just relieve the pressure from the fuel line and swap this part out. I decided to pay Toyota to do it just in case it didn't fix the noise, I wouldn't get blamed for an incorrect installation. This part is located on the fuel rail on the driver side where the fuel inlet hose is. This bad dampener could cause fluctuations in the fuel line which could cause a cylinder to receive too much or too little fuel which in turn could create a knock.

I have 08 4runner V8 ONLY 14,000 miles and I hear this ticking noise, Im guessing this maybe the same noise veryone hearing. I bought mine used, No warrenty. will this be cover by Toyota or will I have to pay thanks. I'm guessing I will be paying for IT.

the most disheartening things about it is that even if you paid thousands to have it repaired, you are putting on the same crappy manifold that has a history of cracking...this is the biggest deterrent against repairing it, in my opinion.

100% agree, this is why Im so hesitant to spend the time and money to replace it.... when others have had the replacement fail again later.