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Well, thats a lean code and it can mean a lot of different things. First thing I would do is to visually inspect all the black hoses in the engine bay that connect to the engine. If finding no breaks or craks in those hoses, your next best bet is to put a can of BG44 in the gas tank when about 1/2 full. Clear the codes and see if you get lucky that it was a dirty injector. Lean codes are tough. If still no joy, the next thing to do is a smoke test. Any mechanic garage can do this for you and it will help to see if you have an air leak in to the engine and should help you find that leak.

when I got my 03 D2, 1st thing I did was get an oil pressure guage and had a bolt threaded in the oil cooler port next to the oil filter housing. hooked the guage up and checked my oil pressure, cold, idling and hot idle. that removes any question as to whether your oil pump is working properly.

At the time of this reply, Oct 2024, I dont know yet. Im still assembling it and havent been able to upload the part 3 and likely part 4 yet. In part 4, I expect to be attempting to see if it runs and if the problem is sorted.

Bad engine ticking. These engines are famous for slipped cylinder sleeves and thats what I fixed. As of this writing, I dont have it back together yet but byt early Nov 2024, I will post the last video "will it run?" and "is the problem sorted?"

@@d90autosales cool! I'm going to watch the new video! I have a complete new rebuilt engine that failed......bad rocker shaft and arms....

@@d90autosales my 03 D2 was ticking quite loudly once at temp. I installed the inline thermostat to reduce temps and ran several engine flushes thru it changing the oil several times. Used rislone engine additive and several thousand miles later....no more ticking. I think mine was sticking lifters which this process resolved. So far so good anyway.

I’ve heard that using a larger oil filter might cause a slight delay in oil pressure build-up during cold starts, though that’s just a rumor and may not be entirely accurate. I haven’t personally measured any before-and-after pressure differences, but since I had a box of these filters, I’ve continued using them without any issues. On the 2003 Discovery, there was a batch known for cracked oil pump gears, which often led to pressure problems. So, when I heard that these filters might help prevent pressure loss, I figured it couldn’t hurt to use them.

This sounds like a lifter a slipped liner has a deeper tone and it does it from start up to the time you shut it off now the lifter makes more sense because when the oil is thicker on start up, it has more oil pressure so the lifter can pump up but as the oil thins thins out the failing lifter starts to tick as a result I replace lifters and pushrods on my Land Rover and the sound completely went away. I’m a Rover mechanic at Rover North here in Oklahoma City very common issue to see in the especially 03 and 04 as well as the slipping liner, but slipping liners, has a deeper tone and does it all the timeon start up till the time you turn it off

Replace , lifters, cam and still there

Sorry not i , was the mechanic

Had this problem for 50.000klms now

2004, 4lt

I sold the truck but I believe this to have been just a ticking lifter. I recently heard a slipped sleeve and the sound it makes is way deeper of a tone.

No. I ended up selling it this way. I believe it to have been a ticking lifter.

Sorry mate - just sold it yesterday, 15 Feb 2023

Mine is doing the same thing. I'm using the Rotella 15w40 conventional oil, still the noise is there. I took it to my Rover mechanic and asked if he thought it was cylinder sleeves he said no because cylinder sleeves would sound like that the whole time, not just when warm. He recommended getting Oil Pressure gauge on it check for sufficient pressure. That'll be next attempt. Very interested to see if you've solved it.

Did you get it sotuated?

@@professionalpiercer nope. But I’m pretty sure it’s the rocker arms. The problem with this is that attempting to solve this will require complete disassembly and reassembly of the entire intake to get to the valve covers… and I’m not looking forward to it. Not my everyday driver vehicle so I’ve been postponing

@Sam Shea do you even think it HAS TO BE FIXED? Funny enough, the sleeves on this one I have were all done, including the rocker arms. The ticking is still there.

@@professionalpiercer you know, I’ve had the very same thought. It seems to run fine, I dunno. Again talked to my mechanic friend about it and he said this, “ that tapping is metal on metal somewhere. Eventually that contact over time will weaken one of the parts and it will break. You don’t want a broken rocker arm bouncing around inside the valve cover. That’s even more damage.”

I’ve been all over for exhaust leaks and fixed two of them. They make noise as soon as the engine starts. This tapping doesn’t occur until I hit about 165 degrees.

@@samshea813figure it out?

hello. i have the same problem like u told. do u know what is it ? i use 10w40 castrol magnatec. is that sounds come for bad oil or not ?

No solution but its one of these two items: 1) Slipped Cylinder sleeve(s). or 2) failed lifter(s). Theres an off chance that the oil pump is failing and thus not enough oil to the valve train but you would have a low pressure indicator on your dash board. Extremely common on these Disco V8's - especially 2003-2004

did you fix yours?@@Levan_Chitauri