I have a 2000 disco II. about a month ago it started loosing power BAD!! didnt even want to go up a hill BAD, so I changed the plugs and wires. the coils were good, and I put 2 new o2 sensors in the front banks.
It didnt really help. so, in my vast knowledge I thought "It has to be the cats plugged up because I seafoamed the crap out of it in Nov and agian in Dec. I removed them both but I left the o2 sensors plugged un and reset the computer.
It ran better for all of 10 miles then DEAD lost any and all power. It has to be dumping fuel or the SEI is bad? Its not throwing any codes for those but it is throwing bank1 and 2 o2 sensors whether I plu them in or I have tried to unplug them and reset the computer and run it. nope.
any Ideas besides the given of putting new cats back on? this thing is killing me!! any Ideas are worth a try shoot em to me...

 

With the engine running and your hand at the tailpipe can you feel any air moving?

 

yeah, getting white smoke. plenty of pressure, i figured the white was burnt fuel

 

throttle position sensor? that would throw a code though....hmmm....

 

nope, its not really cutting out, just no power BUT very very rough idle. hmm, I will unplug it and see if there is a difference just in case?
It took an over an hour to make it 5 miles- pumping the gas just to keep it at 10mph. coughing sputtering the works

 

if the fuel air mix was really far off couldn't you get white smoke? And if thats the case could it be a bad or dirty MAF? I know that usually throws codes, but there is a first time for everything...

 

yeah it could, I cleaned the thread off in th MAF once before and it did run better, so thats worth looking at and unplugging aswell- but I do know that it is leaking air around it (MAF) a bit. "If I had a nickel for every code that it has/or hasn't already thrown I'd own a new one by now!" so I dont quite trust the CEL.

 

whats your mileage? are you losing coolant?

 

oh yeah, make sure you don't have chocolate yoo-hoo on your dip stick.

 

mileage is 170k or so, actually yes I am loosing coolant but it has the heater core gurglies. so oh well looking at it there is a small stream filling up around the back of the lifter covers mainly drivers i believe it is leaking out of a port "small amout out the exaust, or condensation?"- but the oil is clean.
If you gas it a bit it will idle well for a sec or two. doesnt look to be a cracked head loosing pressure. freeze plugs are good too.
It seems like it is one of the sensors just sending the wrong signal.