Running Lean
 

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! :tup

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

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. :banghead:


Here's a picture of the plugs, it looks lighter in person.. maybe it's my crappy monitor.
http://www.stang232sc.com/plugs.jpg


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.