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Old 03-10-2011, 06:01 PM   #91
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I gapped them at .55
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Old 03-10-2011, 06:26 PM   #92
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From my exp with my 07 2.0 non-pzev with boltons and a tune for 93:

I've ran 104's at .060 in the past with good results. I switched to 103's at .060 when I started running nitrous and that seemed fine as well.

I dont remember having issues but as of a few months ago (nitrous has been off the car for a while) I would have random bucking/surging when starting from a stop. it would surge like crazy when letting the clutch out and even after clutching in for a second or two it would still happen when I let out. Revving up would be lazy and id have to rev and dump the clutch to get it to act normal. It happened pulling into the garage once and it smelled very rich. Went through everything I could think of (MAF, TPS etc) and 2 weeks ago I switched back to my stock plugs. PROBLEMS GONE!

Weird huh? I think the colder heat range and big gap caused it because it hasnt happened since. I'm going to try AR104's next time gapped at .055 and see what happens...
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Old 03-10-2011, 06:40 PM   #93
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well i have the special california model, with the crappery everything on it, injector, intake, ecu firmware, etc to meet california's standards.
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Old 03-10-2011, 06:44 PM   #94
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Should i try mine with my wideband? I thought ide try the plugs then buzz around the block with the wideband and take a log. Then add the CAI and do it again. and see if i can see any difference.

Right now i have the AP104s in gapped at .055
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Old 03-11-2011, 03:48 PM   #95
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just installed A103's at 84,000 and it feels smoother
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Old 03-11-2011, 04:29 PM   #96
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Buickboy >> Did you note the appearance of the plugs? Any indications of fouling?
Link below for a quick guide.

http://www.ngksparkplugs.com/techinf...000&country=US
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Old 03-11-2011, 08:22 PM   #97
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I did this. I have one question: Why don't these cars come stock with these plugs? They ROCK!
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Old 03-24-2011, 03:21 PM   #98
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I am looking into replacing my 07' 2.0 plugs after 47k miles. After reading through the thread, I still am not sure which are the best for a stock engine.
Looking at the rockauto.com website I see Autolite Xtreme Performance 103's. Does anybody knows what is the difference between those and the regular a103 and ar103 ?
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Old 03-24-2011, 03:54 PM   #99
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Extreme autolites are more likely platinum plugs. A103 and AR 103s are copper plugs. The difference of them is laid out here. Go with a103s, gap to .055 and change every 20k
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Old 03-24-2011, 04:05 PM   #100
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Quote:
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Buickboy >> Did you note the appearance of the plugs? Any indications of fouling?
Link below for a quick guide.

http://www.ngksparkplugs.com/techinf...000&country=US
a little bit of fouling from the looks of it. it makes sense- I changed jobs and am spending more time cruising on the highway (lower rpms). Mustve been a combo of heat range and gap but that doesnt matter because the surge is back after a few stress free weeks.
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