jiayon

This one is for sure the hardest one to get to. I'm sure there is a special tool for this, but I used a extension swivel. It is not the only way of doing it, but I feel was the one that made me suffer less.

If this is your first time make sure you have a couple of spare sockets nearby. They are really easy to fall off and get lost between the firewall and the engine when you are trying to tightened this bolt.

Good luck.

willfxp

ahhhhhh!!!! Got it, finally!!! I had to buy a 1/4" drive socket wrench with a 12mm swivel. That would make it small enough to fit behind there. I couldn't get enough torque, so I used a breaker bar and voom!!! Got it!!! yay! I didn't need spare sockets. I needed a spare wrench! That's what I dropped hah!

willfxp

Also... don't leave this unscrewed overnight or anything. It'll leak gas all over the engine bay somehow

willfxp

If you happen to remove the two other bolts that are unmarked in this picture, remember to make sure the gasket is there when you put them back!

It causes big issues haha.

ralsty

Would this be easier with an air ratchet?

ULTiMaX99

iTrader: (5)

can someone confirm what the torque specs are for the spark plugs? i ask because in javy's thread for the is350, he lists the torque as 18 ft*lbf. so is it 13 or 18?

Jeff Lange

iTrader: (1)

18 ft-lbs is correct. Not sure why I said 13 before, must have been a typo or a misread on my part. :\

Strange.

Jeff

rollinout

Can anyone show me what the intake manifold gaskets look like?

Sorry, I'm a noob with some of these parts. I'm planning on replacing my spark plugs this weekend and I called the parts department and they were saying there's a top part and a bottom part. I know it says on here I need 3 pairs, but I got confused from talking to them. I didn't see them on Sewell but the guy at the parts department was saying they are $10-11 a piece, not pair.

prpjewel

Part #17176 is the only one you need. There are 3 sets in the same package.
I was able to change my spark plugs on my 06 IS250 very easily with this DIY. I really appreciate all the work and suggestions that went into this thread.

Jeff Lange

iTrader: (1)

17176-31050 is the part number for the intake plenum gaskets. You need to order 3 of them. They come individually, not as a set.

These are the upper gaskets between the upper and lower manifold pieces. The lower gaskets are for the manifold to the heads.

Jeff

zinnerbug

250 and 350 are totally different. 250 is harder to work on. i had to remove my manifold too. You forgot to mention in the write up about the manifold seals and to be careful about not tearing them while removing the manifold. Also, make sure to plug everything back since there are serveral harnesses in order to get the manifold off

zinnerbug

Nice write up though!!!!!!!!

meis250

Great write-up, thanks. Here is another guide in the form of a PDF
https://www.clublexus.com/forums/per...ug-change.html
Good luck

nikkon73

With this write up I was able to change the spark plugs.

Now I have a question, has anyone noticed that after the spark plug change the car idles low? almost to a point where it wants to shut off? Also, my check engine light came on and the check VSC display.

Are we supposed to turn on the car for a predetermined amount of time after changing the plugs?

zinnerbug

if you did the work yourself, you might want to check all the harnesses and make sure all of them are connected right. Chances are, there is one that is not snapped in place correctly. You also might want to check and make sure the fuel line that was disconnected in the process is done right with washer in all. Could very well be that the line is not allowing fuel to pass which is causing idling.