The reason , I state chain is because Sweetie’s 2003 Sunfire was a 2.2 with the wasted spark ICM , it had that P0341 code and changing the timing chain cured it. But that was then, this is now.

 

High Speed Glazing?
Hi Guys. Thank you again for all your help. I wanted to give you an update as I changed the plugs to the 41-105 plugs that were recommended. I haven't driven too much yet so not sure if issue is solved. As I noted before, I have not received a lot from the OBD scans I have run. On only one of the stalls that I had, I was able to capture that P0341 code reported.

The RPM observed after replacing the plugs does appear more stable (meaning, I see a lot less fluctuation of RPM while idling), however I do notice what feels like the engine stumbling (note vehicle does have 141,000 miles too) when I come to a stop light (even this behavior I only notice when AC is on). Idle never dips below 500 RPM though so this may be expected behavior. I have run multiple OBD scans too and not a hint of a code right now. If you do still think I should pull off the valve cover gasket to check the timing belt, I could but how do you properly measure the stretch in the timing belt with the valve cover removed?

I did notice one thing when I removed my E3 plugs. I attached a picture to the feed. These plugs have less than 20,000 miles on them, but I noticed a yellowish hue to the electrode. I have never been very good at deciphering the pictures included but from my Haynes manual, those plugs appear to be exhibiting High Speed Glazing. Do those plugs look normal to you guys?

 

E3 sucks. Probably the problem.
Sounds like your AC compressor might be on the edge of extinction. Idle should stay near 700 RPM.
If there is any slack in the chain between cams it is too loose.

 

Just to clarify, I see 41-103 iridium AC Delco plugs suggested, not 41-105.

 

41-103. But if the 105 works you might just leave them. I would not. I would run them for a couple hundred miles and an replace them and take pics as a science project. Good for a B- at least.

What are those things in the picture? Yeah, I know, but what brand and number? Maybe a side view..

 

Hello Pulpfiction.

I know that I was recommended the 41-103 plugs but when I went to order, the 41-105 was the one that popped up for the 2.2L. So, then I checked my Haynes manual, and it also made the distinction of the 41-105 for the 2.2 L engine. The 41-103 was listed for the 2.4 L so I guessed that maybe in the thread, the responders had not noticed that I have the 2.2L engine.

With regards to the plugs that I have pictured, they are E3.74 plugs (made by E3) with a little over 12,000 miles on them.

I could definitely take pictures of the new 41-105 plugs in 100,000 and post the pictures. You guys have provided me with so much new knowledge regarding the details of the HHR, anything I could do to add to the body of knowledge at this site (even if it is a small contribution).

 

Or, maybe Haynes is mistaken, again. The factory shop manual says 41-103 for both.
However, some books say either one is ok. I don't know what the difference is and I don't care enough to search more than the 10 minutes I alredy used.

 

2006 2.2 takes the 41-105 AC Delco Iridium spark plug . The 2007 and up 2.2 take the 41-103 .

 

Ah! I thought they were all 103. Maybe 103 was an improvement/correction. Just different heat range anyway. That’s why I’d be curious as to how they looked. Also curious as to why such a specific plug preference in these motors, thinking maybe the pointy geometry of iridium electrode (in addition to its durability.)

Got curious about that gimmicky E3 plug. (Trying to imaging how a novel electrode design could increase power unless the alternative was causing misfire) I can see how the weird design might reduce detonation in some circumstances.

E3 seems to list that same E3.74 for all the HHR 2.2/2.4’s. Only seem to have one product close enough. They don’t seem to know that HHR SS (turbo) exists, but list E3.66 for the Cobalt SS. Amazon says the E3.74 “fits” the SS, shows you how much you can trust their listings, lol.

Bottom line, seems maybe the E3 E3.74 plug was both causing the idle misfires (and stalls) and causing the P0341 to be set.

 

This is interesting, especially "The Weakness" section. Seems to describe the condition in the OP.
E3 Spark Plugs Review: Is It Perfect Replacement? (autoactuality.com)