Stalling with an Auto Transmission

[Celtoid]

Hi All,

Recently I was trying to get myself out of a soft, muddy bog in my D4 3.0L. Front RH wheel was bogged almost down to the belly of the car and the other three wheels were struggling to get traction (stock OEMs).

I could have aired down, or used my maxtrax but just tried the old jiggle and rev method. I wanted to clear the front wheel a little more so I initiated contingency height by selecting access mode and then manually selecting maximum offroad height once the system went back up automatically. I used rock crawl and managed to wiggle my way out.

Anyway, during it all.....I stalled the car. Engine cut but no warning lights and restarted with no issue. I don't know much about auto's....but how do they stall the engine? I'm thinking something to do with the TC and ABS.....but then what would I know...LOL!!!!

Cheers,

Kev.

[Rockylizard]

Anyway, during it all.....I stalled the car. Engine cut but no warning lights and restarted with no issue. I don't know much about auto's....but how do they stall the engine? I'm thinking something to do with the TC and ABS.....but then what would I know...LOL!!!!

Cheers,

Kev.

Gday...

I don't know enuff about LRs and/or D3/4s ... but for the engine to 'stall' without any warning lights coming on tells me it did not stall but 'turned off'. To my thinking, if it stalled then 'normal start-up' warnings lights would have illuminated.

Therefore, I would think 'something' turned the engine off.

I look forward to the wisdom and LR experience of others.

Cheers
John

[101RRS]

so I initiated contingency height by selecting access mode and then manually selecting maximum offroad height once the system went back up automatically.

Please explain - is this a way to force the vehicle to go into extended height without waiting for the computer to decide whether it needs it or not?

Garry

[Celtoid]

Gday...

I don't know enuff about LRs and/or D3/4s ... but for the engine to 'stall' without any warning lights coming on tells me it did not stall but 'turned off'. To my thinking, if it stalled then 'normal start-up' warnings lights would have illuminated.

Therefore, I would think 'something' turned the engine off.

I look forward to the wisdom and LR experience of others.

Cheers
John

Sorry John, wasn't clear enough. It was like any normal start, normal sounds, normal lights.

I was inferring that if the engine had 'shut down' I would have expected some sort of message. Not that I've actually seen it happen before but there are messages for just about every other thing that occurs...LOL!!!

Cheers,

Kev.

[Celtoid]

Please explain - is this a way to force the vehicle to go into extended height without waiting for the computer to decide whether it needs it or not?

Garry

Hi Garry,

Yes I'd read on this site that you can 'fool' the system into giving you that extra few mms, if you are anticipating the need.

I thought that I'd give it a go, as I was already pretty close to bottoming out.

Warning comes on and then you select access again. It's a soft touch and up she goes...with another message to say that you are in contingency mode. Then you manually drive as high as you can go.

Edit: I'll have to check again as I've seen the first warning message appear before when I've selected access mode from off-road height, as I needed to get something heavy into the back. But that was when I was on a hilly track and had no clearance issues. Maybe it only happens in rock crawl mode. I'll have to dig out the User Manual again too.....it's been a while since I read it.

Cheers,

Kev.

[CaverD3]

It is possible to stall. Done it a couple of times when rolling backwards in forward gear.

[connock]

Ive stalled mine tearing up a sand dune, I was more worried about my turbo not having oil presure at this moment , I started it as quick as I could.

connock

[Celtoid]

Thanks guys,

I was rocking back and forth trying to get the front wheel out of the big hole which was effectively a hill. So there would have been times when I had the transmission in one direction and was actually moving in the other. I know the TC will apply brakes, especially in rock crawl mode...so maybe that's what did it.

Still don't understand how...as in mechanically, it occurs though....:confused:

Cheers.

Kev.

[djhampson]

I've stalled my V6 Petrol in Low 1st trying to climb a massive hill. I thought it might have been a combination of the TC trying to brake the wheels and me suddenly closing the throttle when I realised I wasn't going to make it.

[Celtoid]

Please explain - is this a way to force the vehicle to go into extended height without waiting for the computer to decide whether it needs it or not?

Garry


Hi Gary, you've probably tried this already and I meant to get back to you a while ago, after I looked into it.

If you have any of the off-road modes selected in the Terrain Response System and go from off-road height to access, a warning message comes up.

If you select access again, the car will then try to make the selection, if it hits anything on the way down, it will pop back up to off-road height and advise you that you now have the extra height setting available, allowing you to use the control to gain more clearance.

Cheers,

Kev.


Hi Garry,

Yes I'd read on this site that you can 'fool' the system into giving you that extra few mms, if you are anticipating the need.

I thought that I'd give it a go, as I was already pretty close to bottoming out.

Warning comes on and then you select access again. It's a soft touch and up she goes...with another message to say that you are in contingency mode. Then you manually drive as high as you can go.

Edit: I'll have to check again as I've seen the first warning message appear before when I've selected access mode from off-road height, as I needed to get something heavy into the back. But that was when I was on a hilly track and had no clearance issues. Maybe it only happens in rock crawl mode. I'll have to dig out the User Manual again too.....it's been a while since I read it.

Cheers,

Kev.

[PaulGOz]

Hello,

I have also stalled the vehicle when snatching another vehcile on soft sand. I had numerous attempts as the vehicle I was recovering was immobolised and unable to assist. On the attempt where the vehcile stalled I had a decent amount of revs on board but as soon as i realised we were no longer going anywhre I released the throttle suddenly to prevent digging myself in. I had noticed during this recovery that when I backed off the throttle that the TC seems to apply the brakes to scrub off the momentum in the drive train which is very handy as that is exactly what I was trying to achieve.

I put the stalling down to the torque converter either being locked by the ECU or at sufficently higher enough revs to be locked and then the TC reacting so quickly that it actually locked up all wheels before the ECU realises it needs to unlock the converter or the revs drop sufficently to become unlocked hence stalled engine. I am sure there are some transmission gurus that know more about this than me and hence whether this theory is sound.

Did not seem to have any adverse effect so I just restarted, thought it was interesting is stalled an auto, and continued to assist the Toyota:).

[chuck]

This has also happened to me before.

It was my first time out in the mud & then again in deep snow.
I think it may have had something to do with DSC which limits power if you have not turned it off.

Since familiarising myself with the car thru the aid of this forum & others in person it has not happen.

Now when I am offroad I am pedantic about DSC & being in command shift.

Regards

Chuck

[wrinklearthur]

Ive stalled mine tearing up a sand dune, I was more worried about my turbo not having oil presure at this moment , I started it as quick as I could.

connock
Hi All

I would be also worried about the turbo myself in that situation.

Has there been any work/postings done by members on fitting oil actuator's that maintain the oil supply to the turbo after shutting down the motor suddenly?

The motor stopping like that in Kev case, I would think would be some sort of fail safe working.

Cheers Arthur