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Old October 4th, 2009, 10:07 PM   #1
redram98
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Default 2.2 4cy. loss of mpg's.

just replaced the plugs in my girls 06 cobalt. lost mgp, about 7. replaced worn out ac delcos w/ autolite iridiums gaped all 4 at exactly .040. do these plugs maybe need time to break in or something? ignition system is COP. no check engine light or funny engine noises/shaking.
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Old October 4th, 2009, 10:26 PM   #2
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Autolite's never worked good in any GM I ever owned, replace with NEW AC Delco's and call it a day! In fact I never seen any aftermarket spark plug that performed better than Delco's in GM's. Fords are different...I had a few fords that ran great with Autolites as well as other plugs. Dont know about Dodges?
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Old October 4th, 2009, 11:18 PM   #3
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Yes, do get rid of the Autolites! Also, iridiums are propably overkill for a 2.2 Cobalt.
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Old October 4th, 2009, 11:30 PM   #4
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shit. that sucks. spent 30 bucks on them sob"s. would messing w the gap maybe make a difference? im not like an engine expert or anything. first chevy in my heard as well to be honest.
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Old October 4th, 2009, 11:32 PM   #5
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i was getting 38 hwy, 41 if i really pussy footed around. 2 of the plugs i pulled were atleast mushroomed back to .080 ill check for sure tomorrow at work tho.
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Old October 5th, 2009, 05:26 AM   #6
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You NAPA Item#:AC 41105 and set gap to .043. They should come pre gaped however if one or more is not right you need to be super careful when setting the gap on Iridium plugs so you don't damage the electrode.
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Old October 5th, 2009, 08:41 AM   #7
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yea autolites were supposedly pre gapped but you know how that goes. i had the guy write down the spec on the box at .040 but i do remember seeing it someplace else at
.043 like you stated.
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Old October 5th, 2009, 08:46 AM   #8
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I always use factory stuff for stock replacements. If they wanted something different they would have put them in.
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Old October 5th, 2009, 10:13 AM   #9
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Quote:
Originally Posted by redram98 View Post
yea autolites were supposedly pre gapped but you know how that goes. i had the guy write down the spec on the box at .040 but i do remember seeing it someplace else at
.043 like you stated.
The gap for autolites are .040 but the gap for the delcos are .043...like I said and many other GM owners will tell you GM's love their Delco plugs. I have tried everything else and always go back to delcos.
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Old October 5th, 2009, 10:15 AM   #10
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Quote:
Originally Posted by Disturban View Post
The gap for autolites are .040 but the gap for the delcos are .043...like I said and many other GM owners will tell you GM's love their Delco plugs. I have tried everything else and always go back to delcos.
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Old October 5th, 2009, 10:16 AM   #11
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i run delco plugs in everything. never have problems. i run delco rapid fire plugs in all my gm vehicles
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Old October 5th, 2009, 12:33 PM   #12
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for sure. guess i will be back at the parts counter tonight. thanks guys.
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