Looking for ideas. 04 Discovery II. Runs very rich with black smoke once it's warmed up. Rough low idle. Plugs, o2s, wires, coil pack, maf replaced. Temp sensors and tps ok.
Thanks

 

I would thoroughly check out the intake. from the throttle plate all the way to the fender where it pull is fresh air. The intake box pulls in air thru a passageway that goes to the front fender. I have seen these collapse and limit the air coming in.
Also, did you replace o2's with Bosch?

 

Same for the MAF, did you replace that with Bosch?

Are there any codes being thrown?

 

O2s are bosch, not sure about the maf though.
Codes:
P0130
P0152
P0707
P1129
P0135
P0155
P1300
P0304
P0302
P0306

 

Oh, wow. Ok. Off the top of my head, all those P030X codes are misfire codes. Cylinders 2, 4, and 6. The 1129 appears to be an O2 code, but nothing really conclusive. The 130 is an O2 code (bank 1 sensor 1) and the 152 is also an O2 code (bank 2 sensor 1). The 135 is a lean code. Not sure which bank. I don't even see anything on the web about the 707 for a Land Rover, but on a Hyundai forum it appears to be some kind of transmission code.

From that, I'd check and make sure your O2 connections are clean and fully plugged in. With the transmission code and all those other codes, I'd put some money on the MAF not being the one you needed also. I'd be sure to get a genuine Bosch and return the one you have.

And I hope I don't need to say this, but DON'T DRIVE YOUR TRUCK. In it's current state you're going to do some real damage driving it, especially with the misfires. Those will eat a catalytic converter in no time flat. I killed on in half an hour of total run time, 5 minutes of driving, with fewer misfires than that.