Hello from Canada. Just picked up a 2014 LR4 with the 3.0 supercharged. It’s my second LR4. Had a 2010 with the V8...loved it.
It’s been stalling occasionally and running rough, chugging and sputtering. Shut it off and start it again and it goes away.
Dealer has looked at it twice. Both times they said it was wiring related to the fuel control module. First time they replaced a connector. Second time they did an overlay wire.
Still isn’t fixed. Seems to do it more at the beginning of a drive.

Any ideas or suggestions?

Thanks
Doug

 

Pretty tough to even guess without knowing more. Do you have a list of the DTCs, or do you know why did dealers said it was the fuel control module? Do you have a scanner (like GAP tool) to see fuel trims, fuel pressure, or misfire reports?

 

Hi again. I got the DTC from the dealer. P091-64.
The tech notes that if the wiring doesn’t correct the issue then the HP Fuel Pump Timing will need to be checked.
It’s back in the shop now. We’ll see next week.
Any thoughts let me know.
Doug

 

I think the code is probably P0091, which pertains to fuel pressure regulation, but I cannot find the subtype P0091-64. Not sure he’s got the right sub-code there. Or maybe it’s specific to Canada?

At any rate, I don’t understand why fuel pump timing would be the next logical step here. The HP fuel pumps run off a dedicated auxiliary cam shaft that is chain driven from the primary cam shaft. Unless the heads were removed or a timing chain repair done (which isn’t really likely on a 2014, unless it overheated at some point in its past - happens, but unlikely), it doesn’t seem like that fuel pump cam would have skipped timing. Also, this doesn’t seem like the code you’d be getting from that scenario - but I suppose its possible.

P0091 is supposed to relate to a problem in the electrical control circuit. That doesn’t mean that it can’t result from a mechanical problem, but I would think that the likely suspects aside from the wiring harness would be the electrically controlled fuel regulators themselves (build into the HP pumps as I recall) or the fuel rail pressure sensor, which is part of the same control circuit. After that, maybe look at actual fuel pressures to make sure they are correct and, if not, look at a failing HP pump, LP pump, or leaking injectors.