Changing I6 spark plugs - blow-by-blow
#33
Lexus Test Driver
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did you properly gap the plugs before you installed them?
#35
Lexus Champion
iTrader: (13)
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Just wanted to update this useful thread with some info:
Spark Plug specs:
Electrode gap 0.043 in (1.1 mm)
Torque value 13 ft.lb (18 Nm)
1. Remove wire covers.
2. Remove throttle body. Refer to FUEL SUPPLY AND AIR INDUCTION .
![](http://i172.photobucket.com/albums/w15/nicenslomo/Diagrams/41986613.gif)
Disconnect negative battery terminal.
Drain engine coolant into an approved container.
![](http://i172.photobucket.com/albums/w15/nicenslomo/Diagrams/41986614.gif)
Disconnect cables from throttle body.
Disconnect PCV hose from valve cover.
Disconnect power steering air hose from timing cover.
![](http://i172.photobucket.com/albums/w15/nicenslomo/Diagrams/41986615.gif)
Remove throttle body bracket.
![](http://i172.photobucket.com/albums/w15/nicenslomo/Diagrams/41986616.gif)
Remove the following connectors and hoses:
Throttle position sensor
Sub-throttle postion sensor (if equipped)
Sub-throttle actuator (if equipped)
IAC valve
4 vacuum hoses
![](http://i172.photobucket.com/albums/w15/nicenslomo/Diagrams/41986617.gif)
Remove throttle body mounting hardware.
Disconnect 2 water bypass hoses.
Remove throttle body and gasket.
Reverse procedure to install, using a new gasket and noting the following torque values:
Throttle body - 15 ft.lb (21 Nm)
Throttle body bracket - 15 ft.lb (21 Nm)
Spark Plug specs:
Electrode gap 0.043 in (1.1 mm)
Torque value 13 ft.lb (18 Nm)
1. Remove wire covers.
2. Remove throttle body. Refer to FUEL SUPPLY AND AIR INDUCTION .
![](http://i172.photobucket.com/albums/w15/nicenslomo/Diagrams/41986613.gif)
Disconnect negative battery terminal.
Drain engine coolant into an approved container.
![](http://i172.photobucket.com/albums/w15/nicenslomo/Diagrams/41986614.gif)
Disconnect cables from throttle body.
Disconnect PCV hose from valve cover.
Disconnect power steering air hose from timing cover.
![](http://i172.photobucket.com/albums/w15/nicenslomo/Diagrams/41986615.gif)
Remove throttle body bracket.
![](http://i172.photobucket.com/albums/w15/nicenslomo/Diagrams/41986616.gif)
Remove the following connectors and hoses:
Throttle position sensor
Sub-throttle postion sensor (if equipped)
Sub-throttle actuator (if equipped)
IAC valve
4 vacuum hoses
![](http://i172.photobucket.com/albums/w15/nicenslomo/Diagrams/41986617.gif)
Remove throttle body mounting hardware.
Disconnect 2 water bypass hoses.
Remove throttle body and gasket.
Reverse procedure to install, using a new gasket and noting the following torque values:
Throttle body - 15 ft.lb (21 Nm)
Throttle body bracket - 15 ft.lb (21 Nm)
#36
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You think it's possible for someone with no experience under the hood to attempt this? I tried 3 DIY's so far but none under the hood this much. I need to change my plugs soon and well It's going to cost roughly 200+ dollars at a local auto mechanic and I don't even want to know how much it'll be at a Lexus Dealership (maybe I should try toyota dealership?)
I read the whole thread and at one point, mentions that you can access the sparkplugs by only having to remove the "upper intake manifold" piece off, which is the Y looking thing right? but that Throttle Body seems like its more in the way, could I get instructions step by step through this means? Or should I stick to the initial post which breaks down almost everything. One poster even says he does the plugs within 25 mins which is pretty fast. Which route should I go if I were to attempt it?
After looking under hood right now, I think I even might have a leaking distributor.. As I notice more fluids under the little tray/pan thing right under it after cleaning it dry the day before.. and I see a puddle of fluids on the bottom cover thing. damn -.- Time to search a DIY for that <_<
I read the whole thread and at one point, mentions that you can access the sparkplugs by only having to remove the "upper intake manifold" piece off, which is the Y looking thing right? but that Throttle Body seems like its more in the way, could I get instructions step by step through this means? Or should I stick to the initial post which breaks down almost everything. One poster even says he does the plugs within 25 mins which is pretty fast. Which route should I go if I were to attempt it?
After looking under hood right now, I think I even might have a leaking distributor.. As I notice more fluids under the little tray/pan thing right under it after cleaning it dry the day before.. and I see a puddle of fluids on the bottom cover thing. damn -.- Time to search a DIY for that <_<
#37
Lexus Champion
iTrader: (2)
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
You think it's possible for someone with no experience under the hood to attempt this? I tried 3 DIY's so far but none under the hood this much. I need to change my plugs soon and well It's going to cost roughly 200+ dollars at a local auto mechanic and I don't even want to know how much it'll be at a Lexus Dealership (maybe I should try toyota dealership?)
I read the whole thread and at one point, mentions that you can access the sparkplugs by only having to remove the "upper intake manifold" piece off, which is the Y looking thing right? but that Throttle Body seems like its more in the way, could I get instructions step by step through this means? Or should I stick to the initial post which breaks down almost everything. One poster even says he does the plugs within 25 mins which is pretty fast. Which route should I go if I were to attempt it?
After looking under hood right now, I think I even might have a leaking distributor.. As I notice more fluids under the little tray/pan thing right under it after cleaning it dry the day before.. and I see a puddle of fluids on the bottom cover thing. damn -.- Time to search a DIY for that <_<
I read the whole thread and at one point, mentions that you can access the sparkplugs by only having to remove the "upper intake manifold" piece off, which is the Y looking thing right? but that Throttle Body seems like its more in the way, could I get instructions step by step through this means? Or should I stick to the initial post which breaks down almost everything. One poster even says he does the plugs within 25 mins which is pretty fast. Which route should I go if I were to attempt it?
After looking under hood right now, I think I even might have a leaking distributor.. As I notice more fluids under the little tray/pan thing right under it after cleaning it dry the day before.. and I see a puddle of fluids on the bottom cover thing. damn -.- Time to search a DIY for that <_<
i just did my plugs, valve cover gaskets, distributor o-ring all in about 3 hours...including a lunch and a few cigarette breaks while working in my garage in 30 degree weather. its very easy but i have been doing this kinda stuff all the time for a long time. when i did my plugs i removed the whole upper manifold assembly. i disconnected the coolant hose underneath and placed the whole assembly on the exhaust manifold (engine was cold dont worry
![Smilie](https://www.clublexus.com/forums/images/smilies/smile.gif)
as far as the leak in the distributor it is not the o-ring. i just changed mine and i still have oil in the little metal tray below the distributor
![Frown](https://www.clublexus.com/forums/images/smilies/frown.gif)
#38
Pole Position
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Sorry to bring this back, but can anyone confirm the size of the socket needed to remove the plugs? I want to make sure i have all the tools needed before i start.
#43
Lexus Champion
iTrader: (15)
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this made my life easier. thanks a lot to the OP.
*Edit: i just changed the cap, rotor, cables, and plugs today*
FYI: you do NOT have to completely remove the TB to replace sparks plugs, or remove/change the cables. Just pull the TB out far enough to access the the spark plug ports.
*Edit: i just changed the cap, rotor, cables, and plugs today*
FYI: you do NOT have to completely remove the TB to replace sparks plugs, or remove/change the cables. Just pull the TB out far enough to access the the spark plug ports.
Last edited by MIGS; 12-01-09 at 08:15 PM.
#44
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I never did it before....but me and a buddy attempted and it turned out great...Throttle body was a pain to take out...didn't realize the bottom 2 bolts. The coolant hose is probably the most troubling to remove and re-install.