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Are Your Spark Plugs Gapped Incorrectly?

152666 Views 545 Replies 129 Participants Last post by  wasney
I'm creating this thread to increase exposure of what appears to be a very common issue (affecting 100% of Cruzes so far). This stemmed from the following thread:

My original experiment was to increase spark plug gap over what they are gapped from the factory and test for measurable gains in fuel economy. What I didn't realize was that I had actually gapped them to the correct spec, and they were gapped much too small from the factory.

AllData specifies a spark plug gap of .033-.037 for the 1.4L Turbo motor. Reports so far have come back with .024, .025, .026, and .029 as measured spark plug gaps from the factory iridium plugs. These should have been pre-gapped from the distributor, but clearly weren't.

Coinneach checked his spark plug gap on his Cruze LS with the 1.8L N/A motor and found a .020 spark plug gap, which is absurd for a N/A motor and is smaller than he or I have ever seen before in any engine. He increased that to .035 and had the following to say when I asked if he noticed a difference:

Like a whole new beast. It's not quite as zippy as the 1.4T in the Eco that I drove when I was shopping, but it's a *censored* of a lot snappier now.

I currently don't know what AllData specifies for the Cruze LS, but if someone can get that information into this thread, it would be of great benefit to everyone. Hopefully, someone will get a tutorial/video made soon. There are significant performance and fuel economy gains to be had by correcting the spark plug gaps on these cars.
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How the ef do i do this, and where did i put my dad's spark plug ratchet thing.
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Instead of talking and argueing so much, you guys can just call the dealer...

/end thread
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I think we should all go to the dealership and ask them to re-gap it. That way GM is made MORE aware of this issue.
Mind = Blown. On how much you actually care about a spark plug gap for your "Chevy Cruze".

Other's are entitled to thier opinion, so you dont have to keep throwing up meaningless percentages every time someone disagrees with you . Good Grief :th_thumbsdownsm:
Congratulations, you were the reason for my first post! Too bad it was trying to defend others from your insolent replies.

I just checked out your profile and let me guess you’re in your mid 20's, have no job, and know everything. I have met several people like you in my life and there is no point in continuing a conversation with you. I am sure the mods would have banned you by now with the remarks you have made to others. That is if you didn't end up paying for your "Life Time Premium Membership." Good Luck with that.

What exactly are you trying to do? lol Run a revolution or something, because seriously, nobody will side with you here when it comes to him. Read the 20+ pages.
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