As you can see it is a tapered seat!

https://www.amazon.ca/ACDelco-41-103..._1464026554467

 

I get them hand tight then a little more. No anti seize.

 

From the Cobalt site, G5 site.. Directions! Apparently GM says no anti seize ! I'll change that habit!
They also state torque to 15 ft lbs.

How-To: Change Spark Plugs - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts


The Torque spec shows 13 ft lbs

13
Lbs
17.63 N-m
Connects: Spark Plug To Cylinder Head
Years: All Vote Record: Vote
Note: Vortec - Spark Plug


GM 2.2L-134ci-S4 Torque Specifications - TorkSpec - Knowledge for the Motorhead

 

Recommendation from NGK, Autolite AC Delco and Denso is 1/16 turn if you're doing it that way.
Spark Plug Installation - Technical Information - NGK Spark Plugs Australia
DENSO SPARK PLUGS
http://www.autolite.com/media/11853/torquespecs.pdf
http://www.acdelco.com.au/PDFs/ACDel...tion-Guide.pdf

And Bosch gives 15 degrees http://www.boschautoparts.com/docume...2-75ee08f44e04

My old Saab Turbo used to get through plugs in about 5000 miles, so I'd be changing them every few weeks....first ones on my HHR after 9 years.

 

The acdelco site states this


. Screw the new spark plugs in by hand until just nger tight. If it is dif cult to reach the spark plug socket, use a length of rubber hose to extend your reach.
8. Tighten the spark plugs using a torque wrench and following the vehicle manufacturer’s recommendations. If you do not have a torque wrench, refer to the section on installing Spark Plugs without a torque wrench.


And this!

Note #1: Always replace spark plugs as a complete set. This is especially important with computer- controlled ignition systems.
Note #2: It is very important to properly tighten all of the spark plugs. Too little torque can cause the spark plug to leak combustion gases. Over-torquing the spark plug can damage both the plug and the threads in the cylinder head.
Note #3: Do not use any grease or lubricant on the spark plug threads since this may result in over-torquing the spark plugs, and could lead to engine damage.


It then suggests finger tight then 1/16 turn

 

WELL I don't have a torque wrench so I will probably use the rubber hose method. That is what I was referring to in the OG post haha

 

1/16 turn seems about the same as 15 lbs. I wouldn't go any more than 1/16.

When the wrench clicks at 15 lbs, I think to myself, "man that's barely more than finger-tight!" but when I take the plugs out next time I think, "that's a lot tighter than I expected them to be!"

 

What if any difference in plugs and coil(s) between a 2.2 in my '09 and the 2.4 in my 11.

Would the same plug and coils work for both engines, havent consulted the owners manuals yet
Of course the '09 has a little ways to go to 100 thou. but was just wondering.

I am an Ecotec spark plugs virgin tooo,hehehehe

 

AC Delco 41-103 fit both the 2009 2.2 and the 2011 2.4.
You shouldn't need to change the coils!

 

Thanks Oldblue , wasnt sure so . . .thats good to know. !