playtoy

iTrader: (5)

I pulled a couple of plugs today just to see what everything looked like. I started with #3 it looked like it was running a little rich, so I pulled #4 and it looked great. I decided to pull the rest of them out and found that all of the plugs on the drivers side looked like they were rich and all of the plugs on the passenger side looked good. What could be causing one side of the motor run rich? No codes were thrown and the car felt like it was running good.

Da Swami

iTrader: (6)

Aftermarket fuel rails?

Sounds like the problem resides in the rail, since fuel enters on the driver's side first and that just happens to be the side running rich in your case.

playtoy

iTrader: (5)

I'm still running stock fuel rails. You think aftermarket rails might help.

thedudeZ

iTrader: (14)

I was thinking tune or o2 sensor.

69LT1Bird

iTrader: (1)

I say look at the O2 sensors on the drivers side. You could have one that is still within specs so a code won't set, but just out enough to fatten up your fuel.

Someone needs to explain the other post about the fuel entering the rail on the drivers side of the rail first so that is why it is rich. Lets see, a fairly stock engine, 8 injectors closing off the ends of the rails set to have their respective poppets released at a certain time at a set PSI. How can the place that the fuel enters the rail cause all of the plugs on one bank to be partially fouled?