Can anyone tell me exactly what I'm supposed to gap my plugs at? .040 is factory but I've seen people say it's too much gap and .035 is what they run. Opinions?

 

.032 is where mine are.
.035 on GM stage 2

 

Any benefits?

 

The owners manual is not correct.... 0.040" is much to large for a FI car.

Mine came gapped from the factory at 0.035".

No one can tell u what to set your gap at.... what you need to do is set it to the largest gap possible with out getting spark blowout.

Spark blowout feels like you hit the rev limiter but it usually occurs well before the limiter.

Set the gap, take her for a spin and notice where or if you get any spark blowout. Reduce the gap until it is totally gone.

There are ranges you can try, but every car will be different. Temp and climate play a big part as well.

0.035" is good for stock down to gms2.

Pulleying down or additional breathing mods, try 0.032".

Mine are set at 0.031" but my car moves a decent amount of air.

 

Well depends what engine you have. But me personally i have them gapped at .30 on acdelcos

 

You have an LNF.

OP has an LSJ.

Different plugs.

 

I just have the gms2 kit and an aftermarket filter on factory intake piping.
I guess I'll re gap my plugs after work and see hiw she does. It says I have a misfire on cylinder 1 so the gap maybe too large

 

0.035" is a good place to start. What plugs do u have? Stick with NGK. The LSJ is picky when it comes to plugs. Also, stick with the stock heat range if you are only gms2.

 

Idk if the gap Could cause that tho. I'm new to these cars. I've only owned one for 2 months and so far have replaced plugs, axles, radiator....

 

yes, gap can cause that.... so can worn out plugs.

 

I have ngk plugs

 

ok. good.

 

So you think that could be it? My engine light didn't stay on until after I changed my plugs. And it didn't come on until the plugs were fouled

When I replaced the plugs they were black. Like they were never changed by the previous owner

If I knew how to post a pic on this thread I'd show you guys

 

Upload to photobucket and copy and paste the URL link into your reply box.

You dont have iridiums do you?

 

Coil on cylinder 1 might be bad swap cylinder 1 coil with another cylinder and see if the misfire follows the coil if not plug could be bad or another more serious issue could be at fault.

 

They're ngk g power platinum

 

Your stock plugs look like you are running on the rich side.

Try what term said.... swap coil paks and see if that helps.