I am located in Southern California and recently purchased a well modded 04 D2 from a private party on the east coast. The truck had the SAI system removed by an earlier owner in VT where emissions are apparently not an issue. The three amigo were present as well as a CEL and brake light(so I guess the 5 amigos?). I liked the truck and the owner agreed to take it to a local(to him) independent shop(Shop A) to resolve the issues and perform a PPI. Shop A performed the following:
-reinstalled the SAI system(was removed to install ARB compressor)
-changed the bank A knock sensor
-replaced the left front hub assembly to fix rough road fault
-replaced gas cap due to evaporative system fault after smoke test
-replaced MAS due to throttle sensor and MAS cross check codes
-replaced bank A O2 sensor due to code
-fixed exhaust leak at Y-pipe
-replaced leaking AC pipe and recharged the system


The truck passed the emission test(I received the official certificate) and I spoke at length with the owner of shop A about the truck. He stated it was an "enthusiast build" but was mechanically and structurally sound with no issues requiring attention other than a bad ARB compressor. I told him I was considering driving it back to the west coast and he said it should be no problem. I negotiated a deal with the owner but decided to have the truck shipped to me.


When I received the truck the three amigos were present as was as the CEL. After a few miles of driving the brake light also came on. I also noticed a lot of noise from the rear end and vague feeling steering. The codes were as follows:
P300 Misfire Detection multiple cylinders
P301 Misfire Detection cylinder 1
P302 Misfire Detection cylinder 2
P303 Misfire Detection cylinder 3
P305 Misfire Detection cylinder 5
P306 Misfire Detection cylinder 6
P307 Misfire Detection cylinder 7
P308 Misfire Detection cylinder 8
P1590 Rough Road signal
P4086 Historical sensor left hand front


I found the SAI system re-installed by shop A was connected but was just set loosely in place (not hard mounted) with the main pump pipe cracked. I fabricated a mount for everything and replaced the cracked pipe.


Not having the time to dig in any further and not being able to register it due to the CEL, I chose a local independent shop(shop B) based on very positive recommendations from the local LR club and British Pacific/Atlantic British. They have had the truck a while and cannot find a definitive cause for all the misfires which worries me. They are recommending a tuneup with plug and plug wires(since these are the wrong ones and are incorrectly routed).


I called the owner of shop A to complain. He actually called shop B to discuss the problems then called me back, telling me to find a new shop since shop B was no good. He said it was fine at his shop and the rear end noise was just due to the Oversize tires, the misfire most likely from a bad crankshaft position sensor. Shop B thought there was no way it was just tires causing the noise. I was present when they drained the rear diff and it was at least a quart low with dirty oil and a lot of debris on the drain plug.


I apologize for the long post. I don't trust he opinion of shop A for obvious reasons. I'm concerned that shop B is not able to give me answer about the cause of the CEL although the were correct about the diff noise. And I will still have to deal with the 3 amigos.


Definitely not how I wanted this purchase to go. Any ideas or suggestions about these codes would be greatly appreciated

 

I've never heard of that one.

As for the other misfires. The fact that every single cylinder is misfiring is not good. I would suspect you either have a massive vac leak somewhere or an electrical problem.
I would start off by checking the coil packs and wires to make sure everything is hooked up correctly.
The fact that the SAI wasn't even hooked up all the way could point to very large vac leak and it might be worth it to do a smoke test. If shop A isn't a specialized Land Rover shop then I highly doubt they reconnected all of your SAI correctly. I could be wrong but most mechanics will say they can work on a Land Rover but they really have no idea what the hell they are getting into.

A bad crankshaft sensor would stop your truck from starting altogether I would think, but you might want to check to make sure it's installed and hooked up correctly anyway. I doubt that is your misfire problem though.

It might also be worth it to do a fuel pressure test just to rule out a fuel issue. There is a schrader valve behind the upper intake manifold that you can hook a gauge up to.

 

I appreciate the reply. The shops at both the seller's end and my end are specialized Land Rover shops. I visited the one looking at the car now before taking the truck in and they pretty much only work on Land Rovers. Sounds like changing the plugs and plug wires is a good starting point.

 

If they are Land Rover shops then they might know what they are talking about. Who knows, maybe it is the Crankshaft position sensor. They are a common part to fail and it's under $100. The plug for the sensor is difficult to reach your arm up and get to.

 

I meant to reply to this earlier. There is a plug on the rear driver side of the upper intake. I can't recall what it is plugged to but it is right on top. I lost the keeper for mine and it came unplugged and I had misfires on all cylinders.

Other than that it has to be a vac leak or total failure of the engine management system for all to be misfiring at once. Or maybe the knock sensor. Is it running badly? If not check this thread on knock sensors.