3 Weeks

[mowog]

We went away for 3 weeks and of course the D4 was in the garage lonely for all of those 3 weeks. On return it decided to show its disgust at being ignored for 3 weeks by refusing to start!

The battery wasn't flat all the dash lights would light up when the start button was pushed but nothing no start?

Called LR road side assist (there within an hour) The solution disconnect the battery for 2 minutes and force a hard reset of the computer. Then it was all happy to start again.

[WhiteD3]

We went away for 3 weeks and of course the D4 was in the garage lonely for all of those 3 weeks. On return it decided to show its disgust at being ignored for 3 weeks by refusing to start!

The battery wasn't flat all the dash lights would light up when the start button was pushed but nothing no start?

Called LR road side assist (there within an hour) The solution disconnect the battery for 2 minutes and force a hard reset of the computer. Then it was all happy to start again.

The hard reboot. Have had to do this twice in 4 years. Works a treat

[mowog]

The Discovery 4 had another failure to start event after letting it stand for 2 weeks.

It turns out this is a depleted vacuum issue. (so I am told)

Seems if you leave your D4 alone for a while the vacuum in the brake booster drains away. It would seem the starting safety systems need a minimum brake pressure before it will allow the engine to start. With no vacuum in the brake booster it requires a very high level of pedal pressure to overcome the safety switch. The whole thing seems like a bit of an over kill to me.

[Neil P]

I can appreciate air-tank pressure requirements in a Truck ie. can't
release park brake until tank pressure is up , but in a D4 it's
bollocks to have Canbus stopping you . These "hidden" features
make it a nightmare to rely on really . More problems than Windows 3.1

[Beamin]

The Discovery 4 had another failure to start event after letting it stand for 2 weeks.

It turns out this is a depleted vacuum issue. (so I am told)

Seems if you leave your D4 alone for a while the vacuum in the brake booster drains away. It would seem the starting safety systems need a minimum brake pressure before it will allow the engine to start. With no vacuum in the brake booster it requires a very high level of pedal pressure to overcome the safety switch. The whole thing seems like a bit of an over kill to me.
Did you get the message on the screen about "press the brake pedal to start" when it was refusing to fire up?

I occasionally get this same effect but to a lesser extent, just from leaving the car in the garage overnight - hard brake pedal at the top of its travel, no start and "press the brake pedal" message. It feels exactly like there is no vacuum boost available in the brakes. A hefty push on the brake pedal has always overcome the problem and allowed the engine to start.

I haven't been able to pick any pattern about when this happens, just random occurrences maybe 8 - 10 times in a year of ownership. From what I can recall, there hasn't been any connection with how long it has been parked.

[mowog]

I don't any messages at all.

We don't use use the D4 a lot as I have 2 Mini's for fun around town. When I do get in the D4 its like driving a block of flats after coming from the Mini's.

[Graeme]

Did you get the message on the screen about "press the brake pedal to start" when it was refusing to fire up?

I occasionally get this same effect but to a lesser extent, just from leaving the car in the garage overnight - hard brake pedal at the top of its travel, no start and "press the brake pedal" message. It feels exactly like there is no vacuum boost available in the brakes. A hefty push on the brake pedal has always overcome the problem and allowed the engine to start.

I haven't been able to pick any pattern about when this happens, just random occurrences maybe 8 - 10 times in a year of ownership. From what I can recall, there hasn't been any connection with how long it has been parked.
Same here, except that it occurs several times a week and usually requires 3 start attempts to fire-up.

[gghaggis]

There is an instrument-cluster recall for certain VIN numbers that is supposed to address the occasional "non-firing", amongst other symptoms. Check with your local dealer. The OP's problem sounds different as he's not getting the "Press brake to start" message, so might well be something like a vacuum issue?

Cheers,

Gordon