My 2003 disco with the 8 cyl. had a fuel injector stuck open. It hydrauliced the engine and wouldn't even let it turn over. After it would drain it would start and run but poorly. I found it by turning over the engine with no plugs and got showered with gas. I confirmed it after pulling the injectors and cranking it over.
I replaced the culprit and it started running fine but has a knock now and didn't before. I drove it a bit and you can feel some hesitation. I also changed the oil and filter to get out any gas from the oil. I think it might be a blown lifter from hydraulicing. Any ideas?

 

Well if it was hydrolocked and you tried to crank it over you may have bend a rod or worn out the bearings on that rod cap by all the extra pressure from the cylinder being loaded with fuel.
It should not have leaked enough fuel to fill the cylinder full though, not enough fuel in the lines to do that.
You may just need to drive it for a few days and see if it clears up.

 

It didn't knock when engine turned over before the fuel pumped up and it started. It only knocks when running. It knocks loudest at an idle and quitest at 1500 rpm. I have driven it around probably 30 miles or so and it is still the same.

 

If it is a lifter can they be changed from the rocker cover? or does it have to be torn down more. it sound like it is coming from the same cycl. that had the bad injector. how about pulling the rod cap. Would i see a bad bearing from the oil pan?

 

Pull the plug wire while the engine is idling, if the noise changes and or goes away, you have a semi major job on your hand. Do not continue to drive it as the cost of repair will go out of site, or trash the engine completely.

 

I just ran out and pulled each wire in turn and started the engine but the sound did not change sound or stop with any one cyl.

 

Have you taken a stethoscope and pinpointed exactly where the noise is coming from? Maybe it's not the engine.

 

I suggested you just pull the wire to the cylinder in question, so did you do that while the engine was idling?

 

i started with that one but I pulled it the started the enigine and had the same knocking. Should I start it then pull it as it idles?

 

Yes, that is what I mentioned twice.