What Was Your Spark Plug Gap?

136827 Views 474 Replies 193 Participants Last post by snowwy66, Nov 24, 2019

XtremeRevolution

Discussion Starter · May 25, 2012 (Edited)

If you changed your spark plug gap per this thread or this thread, please report what the original values were here. If you have yet to change them, please remember to report the original values.

My case with GM has been escalated to a district case manager at GM to hopefully get some exposure on this issue. My primary goal is to allow people to go to their dealerships and have their spark plug gaps checked and corrected (as there has been a 100% error rate so far), and the more people and numbers I can present them with, the better.

If your username is on the below list, I already have your numbers down. If not, please post them. I need specific values, such as ".022, .023, .025, .025." I will also need the model year of your Cruze.

We have 37 cars recorded so far. I'd like to get at least 50. My current spreadsheet is also attached.

InsaneSpeed Steve

sciphi

garrettb1

Rosstude

wilde74k

rlw1224

crazylegs

ozman2005

audiobahnman

calintz

charlie_t

cecaa850

Chevyderek72

Ian_12

whatsstuckk5

XtremeRevolution

coinneach

tecollins1

Beachernaut

Red Dragon

twin1987

churdler

Vetterin

UR2N0Z

Higgs Boson

silverram323

OnlyTaurus

jblackburn

H3LLON3ARTH

SlvrECObullet

Campuscop2003

haoleboy

weimerrj

UpstateNYBill

EcoCruzer

danimal

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21 - 40 of 475 Posts

JeffBazell

· #21 · May 28, 2012

Checked today, 5/28/12:
2012 Cruze Eco 1.4, AT, 5800 miles: .028, .026, .028, .028. Only adjusted the .026 to .028. Now all in line with specs per the manual.

obermd

· #22 · May 28, 2012

JeffBazell said:
Checked today, 5/28/12:
2012 Cruze Eco 1.4, AT, 5800 miles: .028, .026, .028, .028. Only adjusted the .026 to .028. Now all in line with specs per the manual.

I would go with the 0.035" what's in the GM maintainence manual. It's more current than the owners manual.

Kruise

· #23 · May 28, 2012 (Edited)

Checked the plugs after changing oil.

.025
.026
.025
.024

Now adjusted to .034. I haven't driven around yet.
Thanks for bringing this to our attention.

XtremeRevolution

Discussion Starter · #24 · May 29, 2012

obermd said:
I would go with the 0.035" what's in the GM maintainence manual. It's more current than the owners manual.

I'm not sure why some people still insist on using the owner's manual or what logic there is in assuming it is a more reliable authority than GM Global Connect, the GM service manual available to all dealerships, and AllData. The owner's manual was probably never updated since the production of the Cruze started. I'm fairly certain the same cannot be said of the service manuals.

Arcticat

· #25 · May 29, 2012

I have a 2012 ECO, the gaps where as follow's 26,27,27,26. I did change them to 33 on all four. Have not had a chance to drive it yet

XtremeRevolution

Discussion Starter · #26 · May 30, 2012

Thank you to everyone who has provided their numbers. I've recorded everyone's results in my spreadsheet, which now has 49 vehicles and 196 plugs recorded.

If looking at this spreadsheet, please note the orange highlighted values. These represent owners who provided an approximation, such as "all 4 were around .025." I believe that, for statistical reasons such as the graph provided on page two, it is important to include those.

The updated spreadsheet is attached.

20126spdRS

· #27 · May 31, 2012

did my gaps last night and i found from right to left .019 .023 .021 .023
2012 M/T 1LT

XtremeRevolution

Discussion Starter · #28 · May 31, 2012

20126spdRS said:
did my gaps last night and i found from right to left .019 .023 .021 .023
2012 M/T 1LT

Wow. Those are all much lower than the average, and the 2nd person who has reported a .019 gap. How's it run now?

spacedout

· #29 · May 31, 2012 (Edited)

XtremeRevolution said:
Wow. Those are all much lower than the average, and the 2nd person who has reported a .019 gap. How's it run now?

I had one at .019(which you recorded before I assume since I posted in this thread), My automatic had a surging missing type feeling between 1,200-2,000rpm when under load. That is completely gone, the engine feels like it makes more power. also seems to not struggle(revs quicker) above 4,000rpm.

EDIT: looking at the spreadsheet looks like my numbers were not recorded(the numbers are posted on the first page of the thread) My 2012 1LT auto was .019,.024,.025,.024

The Wolf Wagon

· #30 · May 31, 2012

Mine were .030 and regapped to .035. 2012 Eco A/T.

obermd

· #31 · May 31, 2012

For the two of you who reported the really small gaps, what are the last 6 digits of your VINs (if you don't mind)? I wonder if a shipment of spark plugs got banged up or dropped on the way to your cars.

fraser420

· #32 · May 31, 2012

Just regapped to. 035. Left the to right they were. 024, .025, .024, .021. I'm in a 2011 eco manual. Definitely notice an increase in low end power aswell as a smoother acceleration overall, but I also put in a KN filter and bypassed the ressonater at the same time, so I can't say how much is due to the plugs

TechCruzer

· #33 · May 31, 2012

fraser420 said:
Just regapped to. 035. Left the to right they were. 024, .025, .024, .021. I'm in a 2011 eco manual. Definitely notice an increase in low end power aswell as a smoother acceleration overall, but I also put in a KN filter and bypassed the ressonater at the same time, so I can't say how much is due to the plugs

I know I did, but you're probably seeing much of the performance improvement is due to the increase in the plug gaps... the filter & resonator delete is going to hopefully improve you MPG on top of what you might see over the plug gap increase. :th_dblthumb2: I did my resonator delete about 3 weeks ago (no K&N drop in yet) & saw a 1.5MPG increase. :yahoo: I'll see what my adjusting the plugs does after this weeks tank of gas.

aewid

· #34 · Jun 2, 2012

Mine is a 2011 LT2 bought in March 2011. With 20,500 miles on the car, the gaps from left to right facing the engine were: 0.026. 0.025, 0.023, 0.025.

aewid

· #35 · Jun 2, 2012

BTW, mentioned this thread to the dealer service advisor and what people were experiencing, 0.022 and lower in some cases, he said that that was way too tight and another guy shook his head in agreement. I told them about the .035 and they were thinking off the top of their heads much higher, but they might have been thinking something else, they weren't the techs.

crazytglo

· #36 · Jun 3, 2012

Just did mine today. All four were at .025. I re-gaped to .031. Should I go to .035?

2012 cruze ls

obermd

· #37 · Jun 3, 2012

crazytglo said:
Just did mine today. All four were at .025. I re-gaped to .031. Should I go to .035?

2012 cruze ls

The US spec is currently 0.028" - I saw this myself in the on-line service manual at my dealership. According to AC Delco Australia the overseas spec, converted to inches is 0.0315.

thekevin

· #38 · Jun 3, 2012

21 21 23 24 changed them all to 36 and I am amazed at how smooth the car accelerates now.

12 mt 1.4t

Sent from my Autoguide iPad app

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XtremeRevolution

Discussion Starter · #39 · Jun 4, 2012

Just updated the spreadsheet with the newest information. 57 cars have now been reported.

jdubb11

· #40 · Jun 4, 2012

i copied and pasted 3 pages of quotes from the other gap thread and brought my car to the dealer. i told them i had some "boggie feel, and lack of throttle responce"(which was true) and wanted the gap checked. they said they would have to duplicate. i said to do what ever ya want, here is 3 pages of people with the same problem from a fourom online. service guy said they dont worry about internet stuff. i said good cuz here is the case # gm has on this issue. he said ohhhhh, well that deals with a specific person for that case. i said ok well here is her name and number. he said, ohhhh well we will take a look at it. they said the plugs were between .027 and .029 and they regapped them to .037. so good news is a got the dealer to do it. bad news is i didnt see for myself what they were and what they are now. i will just leave it if i feel the issues are better. if they presist i will check them again myself. it did feel a bit better but i only drove ten miles home so i will update later in the week

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