The car is running very rich in cruising and general driving.. so basically all around. BLM's were around 108 to 118 at times.. then WOT it's at 128.

What would I look for on a log to see if O2's are any good or causing the rich condition. Everything is basically stock. New coil, plugs, and wires.

 

As long as the left/right Long term BLM arent split very far from each other, i wouldnt worry about it.

Lets say bank 1 is 115, and bank two is 118. Thats fine. The computer is doing its job. If its split 108/118. Thats not good. Try switching the 02s and see if the values follow to 118/108.

Either way, if you are seeing 108 on BLMs, thats not good. 108 is maxed out on the adjustment scale and the computer cannot compensate for any conditon which is rich beyond that.

Just trying to say not every car is going to hold high 120 BLMs on both banks.

Other tries. Clean your MAF sensor with some electronics cleaner.

On the 02s, how old are they? WHen you first strart the car, do the o2s start jumping around fairly quickly, or does one lag behind the other?

 

It's my buddies car.. '94 B4C He has about 40k on it. I was just scanning it today with datamaster. It's obvious the thing is pig rich.

So there's something there I do need to worry about. My car isn't stock but I never get BLM's that low.

He's running 108 lowest and about 116 average.

They aren't split either, they are pretty consistent within one or two of each other.

On a stock car what else would cause overall rich condition like that but the o2's?

There's no tears in the intake tract, and the exhaust isn't leaking..

I'm just not sure why he would run so rich other than maybe bad o2's.

Any other ideas?

I was thinking maybe run speed density and log it that way to eliminate possibility of MAF problem, but didn't have time for that scan.

 

-fuel pressure too high
-MAF sensor readings too high
-EGR valve leaking
-leaking injectors
-canister purge system saturated
-erratic TPS readings
-ruptured diaphragm in the fuel pressure regulator