The original viscous fan would not run at all times and when it did it was fairly consistently at the same speed. The new fan's quieter and runs at all times but unlike the original, at various speeds - slow, medium, fast, etc. I'd never given it much consideration but I believe the original fan likely had that issue for several years. As for the AC compressor it started malfunctioning beginning July which is about in line with when the idle speed started running at 1200RPM nearly all the time along with other symptoms. Like I said with the new one, idle doesn't vary whether AC's on or off, it behaves exactly as it should. The fuel pressure regulator DTC started earlier this year along with some of the other symptoms. Since replacing the sensor didn't solve that and now it's got the lean codes, I'm fairly confident it's an issue with the low pressure fuel pump. I spoke with another tech and he said what's likely happening is fuel's draining back to the tank instead of staying in the lines which then causes the codes and other related symptoms like rough idle.

The recall pays 1.5 hours to remove the flange which also includes the filter, the pump is attached to the flange so it's not really much if any additional. Problem's the indefinite delay and the fact this problem appears to be getting worse. I'd rather JLR do the work and provide a warranty but it's not beyond my abilities and equipment to do it myself.

 

I agree - it **shouldn’t** be much extra to get the pump fixed at the same time. But, these dealers seem to find a way. Upcharge on the parts and charge way too much labor for everything.

 

After doing a bit of research on installing Land Rover AC compressors I found I was misinformed on what these are fitted with as well as learning what likely has been a contributor to the erratic idle, engine roughness and cooling issues. These compressors are clutch-less instead using variable swash plates - continuously variable displacement. Symptoms from failure of these systems included increased idle speed, noise, intermittent warm air, etc. I reckon the failing compressor combined with the low fuel pressure issues are at the root of all of this. As said, many of the issues have been resolved but sadly the new compressor has failed in exactly the same way as the original fitted one so in goes compressor # 3 and then the fuel pump.

 

First, Land Rover techs today are about as inept as can possibly be. I've self diagnosed all of the issues and have solved them, over $10K later.

There were multiple causes for the symptoms and issues here.

One of the first after my own diagnosis and against Land Rover's tech's advice, was replacing the viscous fan. That solved much, though not all, of the erratic idle issues and helped quiet the engine noise and of course resolved the failed fan not spinning at correct speed. The next contributor was the AC compressor, also self diagnosed. Sadly though the main dealer installed a new likley defective compressor incorrectly and destroyed the entire AC system and were quick to quote me $13,500 to repair their damages. After months of attempting to resolve the matter with management, I got no where and will be handling this through JLR and other means. I had another dealer handle rebuilding the entire AC including condenser/dryer, expansion valve, evaporator, another compressor, AC lines, etc.

With that done, the engine became even quieter. But I also noticed a new vibration and after a test found both motor mounts had failed.

The final issue was the fuel flange recall and engine running lean at all times. Since JLR have put the recall on indefinite hold, I decided to handle the repair my self, new flange, seal and low pressure pump.

Now with new pump & flange and new mounts fitted, I can say despite what the main dealer insisted, the engine is now nearly whisper quiet and as smooth as it was when it was new, no vibration, no shuddering, no noises from the filler neck, no shuddering, no load issues, nothing, just smooth and quiet.

So, mark this resolved.

Yes the damage the main dealer did is bad news, but the real bad news now the valve cover gaskets have spontaneously started leaking, a lot...

 

UPDATE

Truck is still running as smooth and quiet as can be however the bank 1 and bank 2 lean codes have returned though no apparent symptoms.

 

Everything still running perfectly, lean DTC triggered under hard acceleration only. No running issues and no apparent vacuum leaks.

 

Prior to replacement of the fuel flange and pump, the truck had a P0089 fuel pressure regulator error. I replaced the fuel pressure sensor and nothing changed. Replaced the flange and pump and the P0089 code was replaced with P2187 and P2189. I can clear them but them promptly return under hard acceleration or sometimes when turning on the AC.

Any ideas?

 

Maybe try resetting engine/fuel adaptations with the GAP tool if you haven’t already (after replacing the fuel pump).

I didn’t read back through to see what other issues you’ve already addressed but seems like other common causes for lean on both banks are the PCV diaphragm, one or both MAFs reporting incorrectly, or other vacuum leaks (seen a couple reports of the drivers side valve cover breather coming loose from the air intake plenum - hard to notice because it attaches on the bottom side of the plenum). Less common that affect both banks: one of the two engine coolant temp sensors going bad or purge valve malfunction. Other things that come to mind, like the HP fuel pumps getting weak, oxygen sensors going bad, or fuel injectors getting clogged, generally affect only one side or the other, so that seems less likely to me, though possible to have them go bad on both sides.

 

Just reading your post more carefully and noticing that the lean codes are setting under hard acceleration and not at rest. Interesting because I thought these particular codes were specific for lean conditions at idle.

Maybe check your fuel trim numbers at idle and see if you are actually running lean at idle or not. Normal at idle, but lean under acceleration, suggests its not a vacuum leak (or PCV) as you mentioned. Could still be engine adaptations or MAFs.

 

MAFs, purge valve, PCV and others all previously tested whilst diagnosing the original concern. I reckon that doesn't necessarily eliminate them as possibilities but I it seems odd, I think, these errors appeared AFTER fitting a new flange and pump. There's a recall for O2 sensors so I might as well book another visit to a different main dealer and have them have a look at all.

FWIW LTFT is usually around +40 and STFT is usually between -10 & +10, all at idle of course. RPM NEVER varies, always sits where it's supposed to.