looking at your spreadsheet, seems we should also be recording model years also. My 2012 was .019,.024,.025,.024
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Good suggestion.looking at your spreadsheet, seems we should also be recording model years also. My 2012 was .019,.024,.025,.024
It would be nice to know if the engines are 1.8 or 1.4T as well. This may give us an idea about the severity of the problem for each engine.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.
I have been making a mental note of this and have not yet noticed any trends.It would be nice to know if the engines are 1.8 or 1.4T as well. This may give us an idea about the severity of the problem for each engine.
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.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.
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.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
Agreed. There are now enough plugs (> 100) in the chart to start doing statistical analysis, but I think just seeing it graphically is sufficient. It also appears NGK was given the same spec for both the 1.4T and 1.8 engines, which makes me wonder if they shouldn't both be 0.035 +- 0.002, despite what both the owners manual and the GM service manuals say.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.