[DML] Spark Plugs - Copper, Platinum, or Silver? (and o-rings)

["Tom Tait" <TTait@xxxxxxxxxx>]

I just replaced my spark plugs, and the engine is not running as
smoothly at any speed, I'm so unhappy I'm driving the wife's car. 

 

The old plugs seemed fine, but I had a fresh set, and while I had the
manifold off it seemed like a fine time to go ahead and swap them. I
took out Bosch platinums and put in champion platinums.  I noted that
the old plugs were gapped at .30, and I gapped the new ones at .26.

 

I have 8.5mm wires that are 2 years old, a brand new cap and rotor,  and
I have tried running both my stock bosch and a spare petronix 40,000
volt coil.  The hotter coil had no effect.  From information on the web
I'm seeing that different plug types and brands may have a dramatic
impact on performance.  I always though a plug was pretty much like any
other these days, but I guess not.

 

I have two year old injectors and no vacuum leaks - I'm pretty sure
there are no problems there.

 

One vendor will only sell the silver tipped plugs, another only has
platinum and copper tipped available and has no silver.  What are you
guys running these days, and how is it working out?

 

Also, I hope to change the plugs again by just removing the idle speed
motor,  but if I have to pull the intake off again, does anyone have the
size of the 6 intake manifold o-rings?

 

Tom

 

 



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