What plugs do you like?

[3100sfi]

What brand spark plugs do you use?


Any reason to go with anything but AC Delco platinums? I believe that's what was in there from factory.


My car has recently been misfiring but throws no codes, my first stop is going to be the spark plugs.

 

[TheOtherNick]

throw some stock plugs back in it.

 

[rynoman03]

On a 3.1L use stock unless you got something else going on.

 

[blueguy]

Before you do that...have you ever seafoamed the thing? Especially with it's age...it might just be a sticky valve or another valvetrain competent.

 

[3100sfi]

I've run seafoam through intake manifold vacuum. Plan to try again.


Have you used it in the oil? A bit of quiet lifter tick but it is not terrible.

It knocks like a bastard when cold but "it's just a little piston slap, it's still good! it's still good!"

 

[dpzelenak]

yeah the 3100 ticks and slaps and sounds like it misses
and when its cold it sounds and shakes like a mother ****er
the stock plugs or ngk platinum is what i run, these motor arnt too picky they just sound like they run terrible all time the no matter what plugs they got

 

[3100sfi]

It's amazing how well the engine performs when you're actually out cruising. 60-70kph and it's smooth as glass

 

[SlowNA06]

Any reason to go with anything but AC Delco platinums?

Platinums **** the bed. Try stock AC Delco iridium plugs.

 

[3100sfi]

I know what I normally do on an iron-headed motor, but do you normally use antiseize on plugs for this motor?

Do you do it when completely cool?

 

[QUICKSILVER462]

Bosh platinums here, no issues, installed 30+k mile ago, althogh I do just drive conservativly and do not do any racing, but do like to go WOT once and a while to keep things clear.

 

[SlowNA06]

I know what I normally do on an iron-headed motor, but do you normally use antiseize on plugs for this motor?

Do you do it when completely cool?

Some people use anti-seize. And I'd use it if I wanted an iridium plug in there for 100,000 miles. If you're swapping plugs every 15k or something like that, it's not enough time for them to seize.