Hi all! i've got a 2002 Disco11, 12,1000 miles head gaskets changed at 70,000
It is running very rough. I changed the plugs, wires and air filter. still pulling codes P1174, P1171, P0174, P0171, P0300, P0302 any suggestions. It also recently over heated when my wife drove it for 20 minutes and longer. I drove it a couple time and it did not overheat.??

 

have you changed out your O2 sensors (front)?

 

What octane gas are you using, paper or K&N type oil filter?
Have you pulled the #2 plug to see what it is looking like?

 

I'll change the O2 sensors this weekend. We always use Hi-Octane and I am using a OEM air filter from NAPA.

 

sounds like you either have a vacum leak in the engine bay or a bad maf let us know what u find.do u hear a loud hissing sound in the engine bay if so u prob have a vacum leak

 

put the o2's in, clear the codes, then tell us the new codes that come up.

 

I changed out the sensors & cleared all the codes. It runs great on the go, and no service engine light or codes since. But after it warms up and when I come to a stop or idle it really has a rough idle.Any suggestions? Thanks

 

what plugs and wires are you using? we reccomend magnecors 8mm wires from apexperformance.net and bosch plat +4 plugs ( i got mine from amazon)

 

Codes P0171 & P0174 are back. and still runs real rough on idle. I did not find any vacume leaks. but right at the air filter the plastic end of the clip pulling down the cover is broken and does not pull the filter cover tight. Could this be the issue? any other suggestions?

 

I'm having the exact same problem. Anyone got a solution for this? i haven't changed the o2 sensors out yet. i am thinking the maf sensor could fix everything, but don't wanna spend the money till i have some confirmation.