Spark Plugs Fouled on Driverside Only, WHY???

[milesz]

I just dont understand. I have a 2002 5.3 and the spark plugs are fouled on the driverside. I checked for leaks, replaced the fuel injectors, intake, fuel pressure regulator, checked and replaced the o2 sensor, and check for exhaust leaks.

Do you guys have any idea whats going on with these plugs?

[ff_jeff]

I remember I had a similar problem a while back. But I was fouling more than one bank. My problem was that the PCV wasnt working and oil from valve covers was pooling in the intake. Take off your intake pipe, open your throttle blade, and use a flashlight to look inside intake manifold. Im betting you might see a puddle of oil on the floor of the intake.
If thats not the case maybe your valve seals on that side went out.
post pics of plugs. But I bet one of the 2 things above is problem

[casey23]

Sounds like u have a leaking intake gasket........

[truckinL33]

The fact that it's the entire bank is usually caused by a bad O2, but since you changed it, that's a tough one. I though the intake gaskets where all individual per runner. That would be mighty odd to have all of them only on one side fail. If it was oil contaminating his plugs through the intake manifold, it would also not only be one entire bank, and he would probably experience detonation or a miss fire in that case. Are you maybe burning coolant or oil? I suppose it could be oil seals, it maybe be a head gasket too. It's hard to diag. without seeing it.

[Marcus]

What everyone else said plus POSSIBLY cat. Need more info or some diagnostics on what's already been said.

[txarkitekt]

I just dont understand. I have a 2002 5.3 and the spark plugs are fouled on the driverside. I checked for leaks, replaced the fuel injectors, intake, fuel pressure regulator, checked and replaced the o2 sensor, and check for exhaust leaks.

Do you guys have any idea whats going on with these plugs?

You check the coil packs? Easy way to see if its the coils is to swap driver's side to the passenger side.