My first post, so please be gentle! It's also a long one to try and get out everything that has been happening, so my apologies up front.
Having some problems with our 2006 L322 Range Rover 4.4 HSE. Currently at 143,000 miles.
Only had it a couple of months now. It had some previous accident damage, so had a few bits and pieces to do on it, and got it for a much reduced price because of that. Almost all cosmetic, rather than mechanical. I have previously owned a 2003 L322 4.4 in the UK, so a lot of the layout and issues are very familiar, but some are of course completely alien.
The RR overall has been driving really well, with no mechanical issues that I could see. The current issue started after I decided to change the spark plugs and coils after getting a misfire on cylinder 3. Everything worked fine for a day, but the following morning she wouldn't start for the first 5-6 turns of the key, and was just getting a click. Checked battery connections and wiring, and all looked fine. Started eventually and drove okay, but every day since has been the same - where it it may start first time, or may take up to 10 attempts to start up. I am now getting very hard shifting between gears 1 and 2, both up and down. From my previous experience, I'm thinking (hoping) it's not a transmission problem, but more of a symptom of what is going on, as that started shortly after the startup problem. I am also getting rough idle.
I have run multiple diagnostics on it, to try and eliminate possibilities every time I have chased a ghost or changed something. Initial code from when the problem first manifested was P0340 intermittent for cam position sensor Circuit A. Initially just bank 1, but then bank 2 sometimes as well. I went back through and checked my work, and made sure all connections were right and wiring all looked intact. After ruling out wiring that I could see, I changed our the cam position sensors to see if that would make any difference, which it did not. As I am getting a rough idle as well, I also cleaned up the MAF sensor and throttle body, which made no difference.
I am using a Foxwell NT510. Apart from the P0340 code, it is also now throwing the following codes after driving:
From the vehicle dynamics control module: U0401 Intermittent, "Invalid data received from powertrain control module" and C1-A00 "Control Module"
From the Transmission Control Module: U2023 Temporary, "Fault received from external node"
And lastly U0416 Temporary, "Invalid data received from Vehicle Dynamics control module".
All these codes keep coming back after starting and driving, except for the cam position sensor circuit A code, which comes back after attempting to start a few times, before driving. I have not driven it very much in a couple of weeks now, mainly because of the extremely hard shifting between 1st and 2nd gears.
Now, I have checked all wiring in the engine bay. But yesterday I noticed some water on the passenger well mat, and I'm kicking myself because I know I've seen it before. It's been a pretty wet couple of months in Texas, so I had assumed it was from my passengers getting in and out of the car, but yesterday I noticed it was dripping slowly from underneath and slightly behind the glovebox. After checking the engine compartment again, I see water underneath the battery. So now I have a couple of questions, which I hope someone can help with.
Firstly, I have heard there are some relays and fuses behind the fuse box in the glove box. Could anyone tell me what these are, and whether having water ingress into there could be causing most of my problems? Secondly, how do I get back there behind und under the fuse box to take a look? Is there anything behind the battery as well, which could be affected? I heard there are some components behind the battery panel. I am missing one rubber seal strip on the outboard side of the battery compartment, which I will of course replace, but is there any other place from where the water is likely to be leaking in? Just as a note, it had stormed very heavily the night before the first instance of the starting problems.
Many thanks in advance for any and all assistance.