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Discussion Starter #21 (Edited)
I believe the center electrode in the two plugs are different, thus the difference in appearance making it appear one is almost gone. I belive the originals were developed by NGK for this GM for this engine series. It appears to have been a dual platinum plug and the replacement rapidfire #6 are just platinum. AC Delco no longer supports the original NGK plug.
This difference should not cause any issues and you probably won't be able to tell the difference.

I only saw 2 O2 sensors, did you decide not to replace rears?
Just the rears for now......and that might explain why all the old plugs look the same........

Go Bucs!
 

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RetroCarGuy530
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Just the fronts for now......and that might explain why all the old plugs look the same........

Go Bucs!
The O2 sensors in the picture (213-1528) are the rear o2 sensors (post converter) for the 2003/2004 model year.

2003/2004 Chevy SSR:
Pre-Converter 213-1527
Post-Converter 213-1528
 

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690 Posts
Discussion Starter #23
The O2 sensors in the picture (213-1528) are the rear o2 sensors (post converter) for the 2003/2004 model year.

2003/2004 Chevy SSR:
Pre-Converter 213-1527
Post-Converter 213-1528
Yeah you’re right..... I installed the after cat 02......late night post.......thanks for the videos!
 

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Discussion Starter #24
Round two......new plugs, wires and two new 02 after cat sensors installed. Started right up, nice smooth idle. Reset check engine light, half tank of our so called California premium gas, drove around town a bit yesterday, then this morning went for coffee and a cruise (see the Poppy thread) Runs great and so far no check engine light.
Thought I’d post results, lots of questions asked here but seldom hear how things worked out
Thanks guys for the advice
 
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