I bought spark plugs from autozone. The computer said they should be gapped to .043. How Dow that sound. Car is moded and tuned as well?

 

no no no no no. .032-.035

 

did mine at .32

 

^ me too. Did you use autolite iridiums also?

 

I've experimented with this quite a bit. Just wanted to see what was what...

Figured out that it's best to just leave them alone. I have the stockers and set to .032. Seems to be the best.

Higher than around .035 seems to provoke misfire and smaller than .032 starts to eat at the throttle response.

 

mitchell says .40 max, alldata says .35 max. could be wrong it is mitchell on demand. I have been gapping mine to .35 and no problems.

good info!

 

i actually went to .030 in the beginning because i thought that was the right gap. Found out it was .032-.035 so i pulled them out and changed them to .032 although they seemed exactly the same as .030 so i dunno. just outta curiousity does it benefit going to a smaller gap?

 

factory spec is .030-.035" Autolites arent a good choice for GM vehicles. ACDelco, NGK, Denso, Beru are the only plugs I ever use in GM vehicles.

 

http://www.ngksparkplugs.com/tech_su...lugs/index.asp <very useful

 

Very good info!

 

i went .32 on mine

 

why aren't they a good choice? they've been in for a little over 1000 miles gapped to .032 and i just pulled them and they look good and everything runs fine.

and i know that quite a few people are here are running them with no problems

 

for example: chrysler loves champion spark plugs. GM just happens to like NGK and of course acdelco. if I used champion's on my cobalt there'd be problems. I'm not sure of the technical aspect but this is what I've gathered doing tune ups for so many years.

 

Ok. Thanks

 

ok but i have no knock or misfires or any loss of performance or anything bad from the autolites and i don't think anyone else that uses them on this forum has had any problems

 

I think maven was just giving you some advice that's all. I would switch over next tune up, or if you're really satisfied do what you want. it's your car.

 

I did a search and this was the best result I could find to answer my question.

I set my gap to .029 and it's running like a champion! With my Aeroforce Gauges, I no longer get random KR at .7-2.9 degrees and my false-positive misfire readings (no official misfire/No CEL) have dropped down significantly.

Vince recommended I go to .028 due to my altitude, but who knows. All I can say is my experience since yesterday (October 4, 2011) has been good so far. I'll keep an eye out, but I'd love to hear your expertise on why this may be bad or beneficial with the mods in my sig!

 

Factory spec is either .040 or .035, I forget, but it depends on your tune/mods and probably your elevation. I'm currently running 1 step colder at .032.. some ppl run .030 or even .029.. depends what works best for you and your application.

 

Factory is AC Delco 41-108 Plugs at .035 Gap. I just bought 2 new sets and they seemed to be .032 out of the box. I left them there.

 

Im at .32 on my 3787s

 

When everyone says they gap it at lets say .032" is that the same when others say .32"?

 

Yes

 

I thought oem were ILTR5D?

 

That's the nkg part number. It's the exact same plug.

 

Appreciate it!