Spark Plugs Options

[phokur]

My Celica is starting to sputter every once in awhile while in 5th gear at about 3grand or so. I'm pretty sure it's plugs. Can anybody recommend any plugs?

[alltracman78]

Actually, it's only 2 brands, NGK and Denso.
And both are "OEM".....

The 99 5SFE takes different plugs than the 94, IIRC.
I might be wrong on that though.
94 should be NKG-BKR6EP-11 stock # 2978

The reason Toyota put platinums in the engines is so they would last longer.
IMO if I had a stock [or near stock] 5SFE I would run V power coppers. :shrug:

99GTauto-Toyota put twin ground plugs in pretty much all the late 90s cars. Most were coil on plug or direct coil ignitions. Yours is a dist, correct?
Honestly, while at work we only use the twin ground plugs, you could always try single ground, or even the V power coppers.
It MIGHT set a cylinder misfire code, but with a dist I doubt it.

Ca gas is no "crappier" than anywhere else in the country.
The problem is, the highest readily available octane is only 91 compared to 93/94 in most of the rest of the country.
Lower octane will allow your engine to knock easier. Colder plugs is one way to decrease knock. [hot plugs can cause knock].
It depends on the engine though.
Your engine should take 87 fine. In which case if it knocks with 91, you have a problem somewhere. Colder plugs [if they help] will only mask it.