Thread: Transient Power interruptions - D4 HSE

So it's different from the infamous D4 'hesitation' coming out of intersections and onto roundabouts, etc?

You'll need to plug in an OBDII code reader (Gap ID tool is the preferred) and check what error codes are present. This is what the dealer should/would have done. The vehicles ECUs log all faults and codes.

If they haven't or wont, take it to a reputable LR dealer or an independent mechanic who knows Land Rovers and has the right tools.

Eric

Originally Posted by Eric SDV6SE

You'll need to plug in an OBDII code reader (Gap ID tool is the preferred) and check what error codes are present. This is what the dealer should/would have done. The vehicles ECUs log all faults and codes.

If they haven't or wont, take it to a reputable LR dealer or an independent mechanic who knows Land Rovers and has the right tools.

Eric

It might not be showing a fault, so live values might also help here to show things like fuel pressures. I’m sure I’ve seen something similar related to fuel pressure issues.

Originally Posted by Allycat

.... overcome it each time by releasing the accelerator and then immediately pressing it again, and the engine would carry on as per normal.

Could be throttle position sensor intermittent fault.

Originally Posted by LRD414

Could be throttle position sensor intermittent fault.

Surely something like that would be logged or cause a cascade type fault that is then logged.

Sorry, but I find it hard to believe that "live" faults are not logged.

Eric

Originally Posted by Eric SDV6SE

Surely something like that would be logged or cause a cascade type fault that is then logged.

Sorry, but I find it hard to believe that "live" faults are not logged.

Eric

If the engine isn’t seeing a fault, eg a sensor is misreporting, and there is no other way for it to know that sensor is at fault, it won’t necessarily report a fault.

You are generally right though that most issues trigger faults as issues generally affect multiple systems.

Thanks for that, that clarifies it for me.

Originally Posted by Celtoid

So it's different from the infamous D4 'hesitation' coming out of intersections and onto roundabouts, etc?

Ah yes, that lovely hesitation before she finally decides to accelerate. No it's not that. It's a very definite sudden loss of engine power, has happened whilst accelerating, and whilst cruising along at the same speed. Honestly I don't know why the Dealer never seems to have any idea. You guys on this forum should go work for Land Rover. At least problems would actually be solved, not "are you sure you aren't imagining it?"!!
Whilst they never did find the problem, it hasn't recurred for a while now. As I mostly use the D4 to tow, lets hope it never happens towing 3.5T up a hill.