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Take a look at the connectors by the front passengers feet and confirm that they haven't come loose. There are three connector there I believe.
Also take a look at the wiring harness under the air box.
These tips are from Diesel owners and intermittent connections for the diesel engine will likely result in a different effect than it will for us 3.2 owners.
And it is always possible that a mouse has attacked your LR2.
Sorry for the delayed update. I had pretty much given up on my efforts and was about to take it to the dealer when the cooling fan stopped working. My wife unfortunately didn't remember about that and left it idling which caused it to overheat, melt the thermostat, and crack the radiator. After a week of waiting for replacement parts, I took it all apart, replaced the rad, upper rad hose, and thermostat. I also noticed the coolant temp sensor connector clip was broken, so I zip tied it on firmly. I also cleaned and applied a small amount of dielectric grease to all the intake plenum connections.
After putting it all back together the thing runs perfectly.... I bought an IIDTool to check the sensor data and read the fault codes better. The fuel trims are all single digits and there are no fault codes present. Guess I'll have to wait to confirm it doesn't die on a long trip, but even around town up the big hills it's super smooth with no chugging. So I'm guessing a sensor wasn't plugged in correctly on the intake or the coolant temp?
Ok I spoke too soon. I did some big hill climbs repeatedly for about 30 minutes and it started chugging/pulsing from 0-100km/h after the third climb, the first couple were fine. Although once I hit cruising speed and held it the chugging stopped. I plugged in my IIDTool and tried reading some info. The fuel rail pressure dipped to 37-45psi on WOT, and then steadied out around 55psi when released (as told by the sensor, looks like trying to measure with an actual gauge is a bit more complex for this engine
) Fuel trims were all still single digits. I'm guessing if I were to do the hill climbs repeatedly it would eventually hit limp mode. No engine fault codes were produced afterwards.
Note: if you read the Technical Bulletin the failure modes are
* Erratic Fuel Gauge
* Loss of Fuel Pressure
And you seem to have both of these failures.
For reference if you don't have enough fuel pressure then the ECU will cut back on the Engine Output to prevent loss of conformance to emissions requirements.
If you search for this it is typically referred to as Limp Mode.
I suspect that you are intermittently going into Limp Mode.
And a fuel pump with an intermittent connection would be most noticeable when the engine is consuming a lot of fuel.
When I was younger In had a fuel pump fail on my BMW 535 and it was only noticeable when I would climb a hill. However once it started failing it would do it every time on the same hill. So that fact that you have an intermittent problem and a Fuel gauge problem make me think that you should check the wiring harness.
For reference the connector is accessed by lifting the back seat cushion and then lifting the carpet that is cut out for access.
07-14-2022 | 11:36 AM
