Thread: Did Parts Store Give Me Wrong L67 Spark Plugs?

First, yes I did search previous threads, but found much conflicting info/opinions.

'01 GTP, bone stock. 151k miles.

Car currently has ACDelco 41-101 Iridiums installed. https://www.summitracing.com/parts/ado-41-101

O'Reillys dude sent me with ACDelco Professional 41-902 https://www.summitracing.com/parts/ado-41-902

Owner's Manual says OE spec calls for NGK Type PTR4B-15 https://www.summitracing.com/parts/ngk-5146

I even went back in to double check, I didn't remember the part number for the iridiums offhand, but knew it didn't sound right.


Now, from what I've read, plat plugs don't agree with waste-spark ignition systems, or forced induction. Check, and check.

So, go ahead and install the double plats i have, or go return them for the 41-101s, or something else you guys recommend?

Thanks, good to know. Durka Durka.

oooh durka durka durka muhommed jihad

Originally Posted by mguzzo

IMHO if you drive like its a stock car and don't beat on it

I try to, but easier said than done. Usually end up getting into the boost once or twice on a 15mi drive into town. That sweet sweet blower whine is addictive.

Anyway, went ahead and returned the plats for 41-101s this morning. Judging by the condition of the old ones, motor seems pretty happy with them. Now just waiting for a new coupler to come in to get rid of the rattle at idle.

Off topic, but whats a normal idle rpm range? Mine starts around @ 1300, then settles down to 1k-1100 after a few seconds. But, also found a few worn vacuum fittings while i was in there, gonna finish tracing vac leaks tomorrow.