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post #1 of (permalink) Old 05-10-2018 Thread Starter
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AC Delco Spark Plugs - Install Instructions?

Hi All,

I've searched and searched but haven't found concrete info.

2012 Impala LTZ - 3.6L.

Changing the plugs this weekend with OEM: AC Delco: 41-109.

I'll be able to torque the front plugs, but not the rear due to the intake.


1st question: Gap
- Manual says .043". I'm reading some people on the forums saying .040". Thoughts?

2nd question: Torque
Online I am reading Torque spec: 15 ft/lbs. Correct?
I can torque the front 3, but not the rear due to the intake.
Is everyone just doing the 1/8th turn?

Thanks!
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post #2 of (permalink) Old 05-10-2018 Thread Starter
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Just realized this should probably be in the maintenance forum - @Admin can you please move over for me?
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Read this entire thread - you can change the rear plugs without removing the intake or anything else. The one member even made a video showing how easy it is near the end of the thread:

https://www.impalaforums.com/chevy-im...done-it-3.html
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@jtrosky - Thanks for the reply! I've actually been through that thread and all over youtube haha.

I was planning on leaving the intake on - more curious what people have been doing to torque down the rear spark plugs?
I figure I could do the front three, gauge the angle on those, and try my best to do the same on the rear? Or has someone successfully gotten a torque wrench back there??

Second question - The manual says .043" gap - but even in that thread you shared people are saying .040. which is it?
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Not sure about the gap - I'll try and check my service manual and see what that says.

To torque the rear spark plugs, I'm assuming you can do it with a torque wrench using some extensions (maybe the kind that "pivot")? I haven't done it yet myself.. I'm sure someone that has done them will chime in shortly though.
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^ Check the owners manual or underhood sticker for plug gap.
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Maybe I'm dumb, but I always just do spark plugs by feel. I suppose you could do the front ones with a torque wrench, and then put the wrench you are gonna use for the back ones on the fronts and feel how much effort it takes to turn it a fraction more. Should get you in the ball park.
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post #8 of (permalink) Old 05-10-2018
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^+1. At 68, I'm calibrated, lol! Except for tty head bolts!
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Quote:
Originally Posted by Chives3300 View Post
@jtrosky - Thanks for the reply! I've actually been through that thread and all over youtube haha.

I was planning on leaving the intake on - more curious what people have been doing to torque down the rear spark plugs?
I figure I could do the front three, gauge the angle on those, and try my best to do the same on the rear? Or has someone successfully gotten a torque wrench back there??

Second question - The manual says .043" gap - but even in that thread you shared people are saying .040. which is it?


GM has issued TSBís stating NOT to change the gap on the ACDelco iridium spark plugs, as changing the gap can damage the iridium coating on the tip (it is not solid iridium) and thus damage the plugís longevity.
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Just did mine a couple months back. Itís tight back there, but you do not need to remove intake. Tightened mine by feel also.

2012 LT - Silver Ice Metallic
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post #11 of (permalink) Old 05-11-2018
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I would suggest a little anti seize on the threads before installation.
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Quote:
Originally Posted by MarkTN View Post
I would suggest a little anti seize on the threads before installation.
GM service manuals state not to use anti seize compound on the spark plug threads. The ACDelco spark plugs have a special coating on the treads.
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Quote:
Originally Posted by mwilson62000 View Post
Just did mine a couple months back. Itís tight back there, but you do not need to remove intake. Tightened mine by feel also.
How many miles on your car and how did the plugs look? There is a rebate on AC plugs till the end of this month so I am going to grab some for both the Impala and the Yukon.

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^ Fwiw, I always dab the plug threads with a 'lil anti-seize and boots with dielectric grease.
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Quote:
Originally Posted by jtrosky View Post
Read this entire thread - you can change the rear plugs without removing the intake or anything else. The one member even made a video showing how easy it is near the end of the thread:

https://www.impalaforums.com/chevy-im...done-it-3.html
Yep, this was the thread that got me started here. Came in to thank that user.

I used autolite plugs for mine, gap was called for being .040 and went to tight to feel rather than attempting to use torque wrench. Dialectric for boot, but did not use any antiseize on the threads.

My 6 year constantly asks why. What adults can learn from 5 and 6 year olds, to listen with your ears and mind open. Hard to learn when you don't listen ......
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