I replaced my plugs yesterday and checked them against some pictures in my brother's automotive book and they look like the ones that show a lean condition. The engine is pretty much stock except for a K&N filter which I cleaned the night before. The plugs I had in before were Bosch Platinums which were gapped to stock spec, I think they went in last summer. I replaced them with Champion Copper plugs, also gapped to stock spec.

What could be causing me to run lean?

 

can you post some pics online of the plugs?

I would have your A/F properly checked with a wideband...not a tail pipe sniffer (those are worthless)

If you are not getting proper fuel supply...pumps, injectors, bad filter, etc you can run lean.

 

Good Advice!

 

Oh by the way, stay away from the Bosch Plugs! Try a fresh set of NGK when you get your problem fixed.

 

Yeah I was reading up on bad idle on a V6 forum and someone said they had new Bosch plugs, got rid of them and their idle was great. I think I even bought Bosch for my SuperCoupe engine last year not knowing.


Here's a picture of the plugs, it looks lighter in person.. maybe it's my crappy monitor.



This engine isn't being built for performance, I just want it to last until I get my new engine in, hopefully in a couple months max.

 

I have an Autotap OBD-II datalogger if that could be of any use to you. I know it's not wideband so it's not perfect, but maybe other data could help.