1995 GSR Integra, original B18C1. Noticed lately my mileage has been decreasing. All maintence is up to date, plugs were changed in April (4/2009). NGK Platniums - BKR6EGP. The car has a short ram intake, DC 4-2-1 exhaust that's dented on the bottom, and 2.25" exhaust. It's tuned on eCtune, A/F ratio was set at 14.5 @ idle, not sure what was at WOT. the car runs great, doesn't burn oil, compression across the board is 245psi-250psi, pulls like a bat outta hell, but lately I've noticed my mpg has suffered a little bit. Last time I changed plugs the old ones look a little darker than this, like a light redish brown, ei; normal.

Including some pictures, plugs are lined up from cyl # 1-4.






Let me know what you think... do the plugs look abnormal?

Thanks

 

Looks lean from here.

 

That's what I was thinking.... What could cause the car to run lean all of a sudden though? Nothing has changed since the car was tuned..at all.

 

when was it tuned?

 

I would say it's leaned out

 

Can't tell much from old plugs. Slap in a new set, do a wot run at whatever RPM you want to know what the engine is doing and take more pics.

It's impossible to tell what is going on inside an engine by looking at old spark plugs, much less when the last action they got was at idle.