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- Lexus IS GS: How to Replace Spark Plugs
Step by step instructions for do-it-yourself repairs
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DIY: IS350 Spark Plug Service
#31
Driver School Candidate
Be careful about adding lubricant to the threads if the service manual doesn’t call for it. The torque specs were probably determined without lubricant. If you apply lubricant and then apply the service manual torque you could end up over tightening.
#35
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Any Guide for the IS250? Is it the same or much more difficult?
Also are these the OEM spark plug?
http://www.lexpartsworld.com/scripts...?idproduct=546
Also are these the OEM spark plug?
http://www.lexpartsworld.com/scripts...?idproduct=546
#36
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i work at a lexus dealer...these IS models are cake to work on..i timed myself once 5 minutes to remove the entire manifold..makes your life alot easier with the right tools
#41
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Thanks
Thanks for the great how-to. My Lexus dealer quoted me 700 for the 60k service. I've loved the car since it's had 4 miles on the odometer but that dealership just keeps reminding me over and over why they're likely to never get another dime out of me.
#42
Those old plugs they pull out looks like they are in EXCELLENT condition and would last another 30k: the center electrode is sharp and long, the color looks great, the gap is still LIKE NEW. Unless they predict micro fracture in the ground electrode (unlikely since traditional plug designs have been in turbo charged and super charged cars and works fine) I don't think there's anything to wear out within only 60k.
#43
Instructor
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Why does the dealer seem to charge alot for this particular task.. or is the cost not clear when mixed with the 60k service?
Can't possible take more than a factory trained mechanic more than 1 hour of labor.
As to spark plugs usually hand tighten then 1/2 - 3/4 turn with a wrench is good to go.
This is actually on some of the instructions on NGK spark plugs.. but works on denso too. Be careful with the clickers sometimes you could overshoot and miss it on such low torque
I never oil my plug threads also.. but hand start carefully. I believe oil messes up the torque (manual torque are assuming dry threads)..
Can't possible take more than a factory trained mechanic more than 1 hour of labor.
As to spark plugs usually hand tighten then 1/2 - 3/4 turn with a wrench is good to go.
This is actually on some of the instructions on NGK spark plugs.. but works on denso too. Be careful with the clickers sometimes you could overshoot and miss it on such low torque
I never oil my plug threads also.. but hand start carefully. I believe oil messes up the torque (manual torque are assuming dry threads)..
Last edited by SC3coupe; 08-24-10 at 07:08 PM.
#45
Tech Info Resource
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Why does the dealer seem to charge alot for this particular task.. or is the cost not clear when mixed with the 60k service?
Can't possible take more than a factory trained mechanic more than 1 hour of labor.
As to spark plugs usually hand tighten then 1/2 - 3/4 turn with a wrench is good to go.
This is actually on some of the instructions on NGK spark plugs.. but works on denso too. Be careful with the clickers sometimes you could overshoot and miss it on such low torque
I never oil my plug threads also.. but hand start carefully. I believe oil messes up the torque (manual torque are assuming dry threads)..
Can't possible take more than a factory trained mechanic more than 1 hour of labor.
As to spark plugs usually hand tighten then 1/2 - 3/4 turn with a wrench is good to go.
This is actually on some of the instructions on NGK spark plugs.. but works on denso too. Be careful with the clickers sometimes you could overshoot and miss it on such low torque
I never oil my plug threads also.. but hand start carefully. I believe oil messes up the torque (manual torque are assuming dry threads)..
Use your torque wrench. There is no better way.
Last edited by lobuxracer; 08-24-10 at 08:37 PM.