what spark plugs are you guys using?

[32valvZ]

Ok, I tried the plugs gapped at .040 Not good. The first thing I noticed was a much rougher cold idle.....next, when I blipped the throttle, it had a dead spot. Drove onto dinner & came home, put them back at .050 much better throttle respose when it was hot. Tomorrow, I'll check it when its cold again, but I suspect it will be good like it was before when I had them at .050.

Maybe the thin air up at this altitude contributed to this????

Interesting, I'd be playing around with the altitude issues.

[kenthompson]

Originally Posted by 32valvZ

I think I'll do that. Heres a pic of the "goods" you sent Jeff!

For some reason, this just makes me want to go do a plenum pull.

[Paul Workman]

Originally Posted by bldavis11

I just used the regular NGKs (like every other vehicle). I will want to change the plugs before the irridium's service life is up, so I figured I would just be wasting money. I like tinkering with the car, so it's one more thing for me to do. All of 10 bucks or so for the plugs. JMO.

Yep, according to who's doing the spec quoting, the platinum (P) plugs will last 3 times longer for a given set of conditions than standard plugs. And, the irridium coated plugs will run a little longer still. But, I think of plugs in three phases of life: New, OKay, and the "borrowed time" phase. I respect what Jeffvette recommends - I figure he knows what he's talking about. However, it occurs to me that if one's LT5 spends most of it's life on the highway, it would take a lot longer to burn out a set of Ps, and, as you pointed out, one would have to suffer plugs running in the "borrowed time" phase of their life a lot longer to take advantage of their added initial cost.

Considering all this, and the fact that at 5k miles or less a year it would take me 6 years before I even got close to burning a set of Ps out, and a tank of gas is as much (or more?) than a new set of Ps...what the heck???

Although I fully appreciate your position, I bought the AC/Delco 41-800 platinum plugs anyway (they were available, a little cheaper, and I was impatient). Like you I love to tinker anyway and 4-5 years down the road I hope to be able to save up enough for a new set and prolly never break out of that "NEW" phase of the plugs.

http://198.208.187.182/internet/Vehi...e=25&part=7212

P.

[72ZR1]

Originally Posted by Jeffvette

Yep, I run the iridium plugs on my car and customer cars. Plug # 6341 for your car.

i went to parts store and ngk.com said to use plug #5464 BKR5EIX-11 not #6341 for my 90. what ones should i use?

[XfireZ51]

I settled on the NGK BKR6, a step colder than the stock plug. The BKR7s were a bit too cold. They're gapped at .040". Looking at the ground strap and after some plug cuts, the 6s were just about right. BTW, I'm with bldavis on using regular NGKs.