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IS250 Spark Plug DIY (half arsed) Basic necessity

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Old 07-20-10, 08:24 AM
  #31  
patrick323
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Sorry to revive this thread.

Do think the bolts on the manifold (that I have to remove on the 250..UGH) have any specific torque specs that I need to adhere to?
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Old 08-03-10, 07:23 PM
  #32  
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Pretty easy other than getting to tough to reach bolts.

FYI there are 5 (maybe six, I can't recall) allen bolts. Good luck finding them haha
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Old 09-17-10, 10:32 AM
  #33  
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Originally Posted by f0rsaker View Post
if i remove the manifold to be able to reach the plugs and replace them, i have to buy new gaskets????

Did anyone answer this question?
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Old 09-24-10, 08:21 AM
  #34  
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Plugs from Sewell online and local install for $40.
$125 and full install complete.
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Old 12-30-10, 09:13 PM
  #35  
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Manual says that you need to replace also a throttle gasket



(number 22271-31030), and 3 intake gaskets (number 17176-31050) but I'm not 100% sure if this number contains 3 gaskets or 1.

About torques:

Bolts:
21 N*m{ 214 kgf*cm , 15 ft.*lbf **
Nuts:
16 N*m{ 163 kgf*cm , 12 ft.*lbf **

P.S. One strange thing that I came across:
My IS250 (2007 year) doesn't have this tube connection. Why could that be?

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Old 12-30-10, 09:22 PM
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That is the cold start injector, but I thought all IS250's have it...

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Old 12-31-10, 12:26 AM
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Checked it with spare parts catalog and seems like it is special intake for USA:
Toyota - 17190-31070 - Tank assy, intake air surge
all other euro\japan versions has another number:
Toyota - 17190-31040 - Tank assy, intake air surge.

BTW how this thing helps with cold start on the engine with direct injection?

Last edited by Lohus; 12-31-10 at 01:26 AM.
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Old 12-31-10, 09:00 AM
  #38  
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Oh sorry, I assumed you were in North America...

As for how it helps, I'm not 100% sure, but it seems Toyota wanted to get some fuel into the air before the cylinders for some reason. They don't need have it on the 350 at all (they use 12 injectors, 6 direct port, 6 in the plenum).

Toyota used to always have cold start injectors on their engines, but they got rid of them in the early-mid 90's because of better EFI/injector control. I don't know exactly why they'd want to add it again with direct port.

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Last edited by Jeff Lange; 12-31-10 at 09:03 AM.
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Old 01-29-11, 03:29 PM
  #39  
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Does anyone know what the torque specs for the spark plugs are for an 09 IS 250?

Are they the same for the IS 350?

Thanks!
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Old 01-29-11, 03:44 PM
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18 ft-lbs for the IS250 and 350.

EDIT: This should be 18, not 13.

Jeff

Last edited by Jeff Lange; 06-24-11 at 01:51 AM.
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Old 01-31-11, 05:45 AM
  #41  
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Thanks Jeff!

For someone that has never worked on pre-1975 cars, this was fairly simple. The only thing that ticked me off was the bolt holding the manifold closest to the firewall.... and misreading Jeff's response to my question ( I read 18 ft lb instead of 13 ft lb )

When removing the gas line, note two things: The gas line is under pressure (for all those who like to smoke and work on cars) and there is a washer between the gas line and the manifold that can easily be dropped if you just pull the bolt out.
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Old 01-31-11, 08:12 AM
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Originally Posted by jiayon View Post

When removing the gas line, note two things: The gas line is under pressure (for all those who like to smoke and work on cars) and there is a washer between the gas line and the manifold that can easily be dropped if you just pull the bolt out.
I've never worked on anything involving fuel lines. Is there anything special involved about doing this part?

Thanks!
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Old 02-28-11, 12:13 AM
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Originally Posted by mIStaboi View Post
Pic 4



this took me about an hour and a half cause I didn't really know what to do at all. and that 12mm bolt behind the manifold is a BEEEECH
Anyone have tips on how to get this bolt off? I have pretty small hands, but for the life of me, can't get any good angle on this one.

Thanks!
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Old 02-28-11, 12:54 AM
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Wow! This definitely looks like a daunting task and I am really NOT looking forward to it! As it is I get lazy taking out all the darn clips for the engine covers and putting them back in! Poo!

Thanks for the write-up though! It's going in my bookmarks for future reference
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Old 02-28-11, 05:55 AM
  #45  
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Originally Posted by willfxp View Post
I've never worked on anything involving fuel lines. Is there anything special involved about doing this part?

Thanks!
Nothing special, but it would be wise to have a rag ready and minimize the amount of gas that is spilled over the back of your engine.
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