Replacing my spark plugs Thursday

can you do a write up on a how-to?

kfr291 said:

can you do a write up on a how-to?

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There is a write-up for checking and adjusting the spark plug gaps, which is basically the same thing.

To the OP: I believe the spark plugs are simply updated revisions of an older plug. You may find that one or the other may be discontinued or low in stock. I don't think either will cause any issues.

THe 41-121 is only for motors produced at the flint plant according to the gm parts catalog.

I'd use whichever one is in stock. Not sure what the difference, if any, would be.

GM finallly settled on 0.025-0.0275.

Thanks for the info gentlemen.

So is the 41-117 plug correct in the manual. I want to get new plugs before I go pulling out the originals just incase theres any issues.

heres a quick problem solver for us cruze owners and want to change plugs or anything. Buy a KN air filter, it may cost 50 or sixty bucks but it WILL SAVE you in gas. Trust me on that. NGK which is the plugs that gm originally put in the cruzes in production are the best plugs on the market. Id go with the Iridiums from ngk. Sure they are a little pricey, actually the same cost as the delco's but the iridiums were highly designed for increased mpg, lower emissions, and better fuel burn, which means they burn less fuel to help you go farther. if anyone has a question about a part, im ur man to ask. Im a mechanic who knows his stuff lol. I say that in confidence. Thanks

Can you tell me if acdelco 41-117 plug is correct for the 1.4T

AutumnCruzeRS said:

Can you tell me if acdelco 41-117 plug is correct for the 1.4T

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I have also seen 41-120 & 41-121 listed for these cars. Rockauto used to list more than one of these numbers, now they only list 41-121 for 2011-2013 cruze.

I asked on another topic yesterday if anyone knew of any difference between these plugs.

Do any of these part #s represent any information? I just ordered some 41-117 plugs from ebay so we will see. I think I remember someone had got ACDelco plugs and they were NGKs in a ACDelco box.

Sorry AutumnCruzeRS that it took me so long to reply back to you...According to my knowledge the 1.4L sparkplugs from AcDelco it shows in my catolog that part numbers 41-120 and 41-121 are for the 2012 models with the 1.4L. Not sure where others are getting that other number from. In fact these acdelco p/n's appear to show these plugs will go in the 1.4L and the 1.8L engines. I tried cross referencing that number in acdelcos catolog and it didnt show a cruze fitment footnote, so im assuming whoever told any of you either lied or mistaken part numbers lol.

i got a set of Acdelco plugs today and their gaped to .26 should i leave them or put them at .28

CruzeEcoBlueTopaz said:

Im planning on replacing my spark plugs in my 2012 Cruze Eco with 75k miles and I need to know why ACDelco lists 2 spark plugs for my vehicle and what the difference is. Also the Cruze manual says my spark plug should be the 41-117. What did GM offically announce about the gap ? these list .28 I will upload a picture thursday of what my spark plugs look like after 75k miles and averaging 50mpg actual for anyone who is curious. Thanks for the info.




SPARK PLUG ASM
Part Number: 41-120
Product Notes:
Iridium Spark Plug
ECO

Per Vehicle: 4; Years: 2012-2012

SPARK PLUG ASM
Part Number: 41-121
Product Notes:
Iridium Spark Plug
.028 GAP ; ECO

Per Vehicle: 4; Years: 2012-2012

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Be a man and gap them .035

Well I'm tuned tho


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Whoops sorry, With a tune you should go to .028
http://www.cruzetalk.com/forum/10-e...ssion/10362-trifecta-tune-spark-plug-gap.html

Well why are they gapped at .26 from factories I thought gm wants them .25 to .275


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From Vince @ Trifecta

"It is true there is a discrepancy about what the gap should be - the GM
service manuals say something like .033" or so, and the owner's manual that
came with your car says the gap is supposed to be .028". Based on my
experience tuning turbocharged engines, I believe the .028" to be the
correct gap, and everybody I know that tried to run more than .028" with a
tune ended up with misfire problems."

"I don't believe the "results" people are posting about power, MPG,
drivabililty gains. I believe it all to be placebo.

Short answer: gap them to .028" and don't mess with it. Lol"

- Vince Geglia
Trifecta Performance, Inc.

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From LS1LOL

the largest spark plug gap you can run before blowout will give you the best performance possible. Think of the spark plug as a lighter, and the larger the gap the larger the flame on the lighter. You will get a more complete burn with a larger spark plug gap. I have played with spark plug gap on a few different motors (Supercharged 3800 and LS1) and I personally saw a 2 MPH gain on my Monte Carlo (S/C 3800) from opening my plug gap up from 0.035" to 0.055" (did back to back runs with that as the only difference). That specific setup was running 9PSI boost from an Eaton M90 blower

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I thought on the other spark plug thread it was determined that the gap for the 1.4L turbo was .033" to .037"?