What is the gap on the stock spark plug?

 

hey the stock plug gap on your cobalt is .40 but if you have a a stage kit. or mods i have been seeing and hereing that people are gaping them and where from .26gap to .35gap and its up to you i proable would gap them at .30 to .35 for the best results in my opinion.

 

I believe the stocks are .33 to .40 I forgot, but with my upgrades I gapped them at .28

 

never knew i had to re gap once i add mods thanks for the good info

 

Actually you go to a colder plug with a tighter gap.

 

stock Gap is .42 look in your manual its tells you

 

my manual says 0.04

 

Yeah, .42 is practically half an inch. The factory gap is 0.04

 

I emailed Intense and they said to gap the Autolite #3922 that come in the Stage 3 kit to .045 Does this sound right?

 

Oops...yea .028 gap sorry and .042

Those plugs are good, but with the smaller pully I would definitely gapp them at .028 you need to close the gap of the spark plug. As compression increases, a colder heat range plug is required, as well as higher octane fuel and paying careful attention to ignition timing and air/fuel ratios are also necessary. Advancing timing by 10° causes plug temperature to increase by approximately 70°C to 100°C.

Something many do not know, is that with Higher Compression ratios and Superchargers as well as Nitrous, in many cases smaller spark plug gaps must be used as well as the use of a much hotter ignition system. These higher cylinder pressures require more energy to jump the spark plug gap.

Proper gapping of the spark plug is necessary to get maximum spark energy, lowest RFI release as well as what is best for the longevity of the secondary ignition components (coil, cap, rotor, wires, plugs).

 

I wonder why they would tell me to gap them to .045?

 

Let me know how your HP Tuner goes for you. I already have a laptop and the GMPP Stage 2 but wonder aloud if I can get more. Some folks say no others in the know say yes. I think I can make a decent gain out of using the tune. Let me know if it is user friendly and has some guidelines.

Also I am going with NGK Iridium IX. What should I gap those to with GMPP Stage 2 3.0"? *pulley, injectors and GM reflash for those living new or living in a box*

I keep hearing around .030. Do they come pre-gaped to the correct spec? Even if they do I always double check my plugs.

Thanks!

 

Yes one other thing. Any benefit to updating the wires or are the stock wires just enough or already top of the line?

 

i have a stage one kit and i'm still on the stock plugs, but i have the NGK Iridium IX plugs waiting to go it once i get a pully, can i just put the plugs in now and not have to worry about anything?

 

Manual says .042" and from the factory them come at .040".

I have mine set at .037".

 

The LSJ doesnt have spark plug wires . It uses 4 individual coil packs with the spark plug boot integrated into the coil pack .

 

well i changed my plugs today, my stock ones were burnt as all hell and looked pretty bad, what would cause something like that?

 

Running rich.

 

yah you're definatley running rich then.

 

I have my stock plugs in the garage and just went and checked the gap, .035"....the manual does say .042"..I put in uridiums and gapped them to .040" and have had them in for a couple of months with no problems...I have a 3" pulley with no tune and dynoed 244whp and 215ft/lbs yesterday....works for me.

 

Those are some nice numbers on the dyno. Yeah I am seeing anything from .030 to .045 for recomendations. Thanks for the info.

Is there a consensus though for proper gap on these Iridium Plugs if running a 3" or smaller pulley?

 

did u have to change cams to put in stage 4?

 

hey i have stage 2 what gap do you recommend to use

 

how are you guys not breaking electrodes when attempting to gap iridiums? you're really not suppose to because of how brittle they are

 

Service Information
2006 Chevrolet Cobalt | Cobalt, Pursuit (VIN A) Service Manual | Document ID: 1522625
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Spark Plug Replacement
Removal Procedure
Notice: This engine has aluminum cylinder heads. Do not remove the spark plugs from a hot engine, allow it to cool first. Removing the spark plugs from a hot engine may cause spark plug thread damage or cylinder head damage.

Remove the ignition coils . Refer to Ignition Coil Replacement .



Important: Remove any water and debris from the spark plug holes before spark plug removal with compressed air.

Remove the spark plugs with a spark plug socket.
Inspect the spark plugs. Refer to Spark Plug Inspection .
Installation Procedure
Gap the spark plug, using round wire type spark plug gap gage.
Gap

Adjust the spark plug gap to 1.0 mm (0.040 in).

Notice: Refer to Fastener Notice in the Preface section.





Important: DO NOT coat the spark plugs with anti-seize compound. Over torquing could occur and damage to the cylinder head threads may result.

Install the spark plugs with a spark plug socket.
Tighten
Tighten the spark plugs to 20 N·m (15 lb ft).

Install the ignition coils . Refer to Ignition Coil Replacement .
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