looking at your spreadsheet, seems we should also be recording model years also. My 2012 was .019,.024,.025,.024

 

Good suggestion.

If those who have already reported their numbers would provide the year of their vehicle, I can certainly have that added to the spreadsheet. I will add those values for all newly reported gaps.

 

2012 mt 1.4t

 

2011 Eco MT here. :goodjob:

 

11' Eco m6


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2012 1lt

 

I PM'd my info - I was surprised that my plugs were either .025 or .026 still under spec but pretty consistent. This is a May 2011 built ECO - Austrian built engine and transmission per the window sticker. By the way the total cost to check and regap plugs was $16 in tools and supplies. Gapping tool was $2, mini feeler guage $3, magnetic 5/8 plug socket $6 and anti sieze $5 from auto zone.

 

2012 ECO A/T Mfg. 11/11

I don't know the plug order, but left to right... 0.020, 0.025, 0.025, 0.020 are all now gapped to 0.035.

 

2012 ECO MT, final assembly Oct 2011

0.023, 0.025, 0.025, 0.023

All now at 0.035 - 0.036

 

AS you know from the other thread; 3 out of four at .025 and one at .020

 

Spreadsheet updated.

I've decided I'm going to go through it later and get the years. Easier than having every person post in this thread.

41 cars have currently been reported in this spreadsheet.

 

Mine were .024 .024 .025 .025

2012 ECO 6m made in Aug 2011 -- if it helps the color is white!!!!

 

For those of you who work better visually, I graphed Xtreme's sheet after adding albow77. There is a very definite peak at 0.025 with the plug gap margin of error being -0.002 +0.001.

 

For those of you who work better visually, I graphed Xtreme's sheet after adding albow77. There is a very definite peak at 0.025 with the plug gap margin of error being -0.002 +0.001.

View attachment 5841

That visual graph sure makes it look like NGK thought they were supposed to be .025, and there were serious quality control problems on top of that.

 

Well you've convinced me to open her up and check.

Question: Where do you buy these spark plugs from? No online store carries them. Even the NGK website does not list 2011 Chevy Cruze as one of it's options.

I only ask in case I break the tip or something.

 

Any auto store should have them. I can't imagine why they wouldn't. Absolute worst case, a dealer will have it. You can also use a different brand Iridium plug.

 

Checked today, 5/28/12:
2012 Cruze Eco 1.4, AT, 5800 miles: .028, .026, .028, .028. Only adjusted the .026 to .028. Now all in line with specs per the manual.

 

I would go with the 0.035" what's in the GM maintainence manual. It's more current than the owners manual.

 

Checked the plugs after changing oil.

.025
.026
.025
.024

Now adjusted to .034. I haven't driven around yet.
Thanks for bringing this to our attention.

 

I have a 2012 ECO, the gaps where as follow's 26,27,27,26. I did change them to 33 on all four. Have not had a chance to drive it yet

 

Thank you to everyone who has provided their numbers. I've recorded everyone's results in my spreadsheet, which now has 49 vehicles and 196 plugs recorded.

If looking at this spreadsheet, please note the orange highlighted values. These represent owners who provided an approximation, such as "all 4 were around .025." I believe that, for statistical reasons such as the graph provided on page two, it is important to include those.

The updated spreadsheet is attached.

 

did my gaps last night and i found from right to left .019 .023 .021 .023
2012 M/T 1LT

 

Wow. Those are all much lower than the average, and the 2nd person who has reported a .019 gap. How's it run now?

 

Mine were .030 and regapped to .035. 2012 Eco A/T.

 

For the two of you who reported the really small gaps, what are the last 6 digits of your VINs (if you don't mind)? I wonder if a shipment of spark plugs got banged up or dropped on the way to your cars.

 

Just regapped to. 035. Left the to right they were. 024, .025, .024, .021. I'm in a 2011 eco manual. Definitely notice an increase in low end power aswell as a smoother acceleration overall, but I also put in a KN filter and bypassed the ressonater at the same time, so I can't say how much is due to the plugs

 

I know I did, but you're probably seeing much of the performance improvement is due to the increase in the plug gaps... the filter & resonator delete is going to hopefully improve you MPG on top of what you might see over the plug gap increase. :th_dblthumb2: I did my resonator delete about 3 weeks ago (no K&N drop in yet) & saw a 1.5MPG increase. :yahoo: I'll see what my adjusting the plugs does after this weeks tank of gas.

 

Mine is a 2011 LT2 bought in March 2011. With 20,500 miles on the car, the gaps from left to right facing the engine were: 0.026. 0.025, 0.023, 0.025.

 

BTW, mentioned this thread to the dealer service advisor and what people were experiencing, 0.022 and lower in some cases, he said that that was way too tight and another guy shook his head in agreement. I told them about the .035 and they were thinking off the top of their heads much higher, but they might have been thinking something else, they weren't the techs.

 

Just did mine today. All four were at .025. I re-gaped to .031. Should I go to .035?

2012 cruze ls

 

The US spec is currently 0.028" - I saw this myself in the on-line service manual at my dealership. According to AC Delco Australia the overseas spec, converted to inches is 0.0315.

 

21 21 23 24 changed them all to 36 and I am amazed at how smooth the car accelerates now.

12 mt 1.4t


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