GS_OREO

I have a 98 Gs300 with 150k, and I just install those plugs in my car. Then I realized when I removed the plugs, the plugs were Denso with dual tips on there. I had a single tip.

I installed them anyways and I did notice a slight power loss, or It could just be in my head.

My question is..
Do you think it'll affect the perfromance/gas milage greatly ?

GS4_Fiend

iTrader: (22)

The iridiums should be single head iirc. The dual heads I think are platinum.

tmf2004

iTrader: (15)

NGK iridiums i beleive for the GS's

www.sparkplugs.com

a#'z

Ngk is fine, Denso is more of Toyota, and NGK is more of honda, that's what i have noticed, but i have NGK Lazer Iridium on my gs. =]

o6spdracer

iTrader: (5)

There have been some good reviews on the Torque Masters. I'm debating between those and the NGK Iridiums as well.

DJ420

iTrader: (5)

Nissan also uses NGK spark plugs for OEM. NGK and Denso are very comparable and similar. I am running NGK Irridiums in my GS4, with no worries!

GS_OREO

Ok cool. I replaced all the plugs. My next step is to replace the valve cover gasket. When I pulled the plugs out, they were all saturated with oil. Is that because the valve cover is leaking ?

Im guessing it should affect gas milage because all that saturated oil on the plugs affect the spark.

tmf2004

iTrader: (15)

Can you PM the part number for the plugs you used? Sparkplugs.com has so many different ones to pick from.

Thanks

Curry

iTrader: (1)

You should have done the valve cover first and then put the new plugs in... It sounds like it is leaking from the way you describe it.

Frankdorn

iTrader: (7)

I'm having the same valve-cover leaking problem. Grab new grommets and gaskets from Lexus and rebuild 'er, swap plugs when you're done.

GSteg

iTrader: (15)

It's the spark plug gasket that's leaking. But either way you have to replace the valve cover gasket when you pull off the cover.