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  #21  
Old 02-17-2018, 01:32 PM
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I thought the above was good too Andrew. LoL

But I can verify that key off (pos 1) and on gear the truck is perfectly steerable. Had that happen to me on a previous x5 that had alternator problems. Was not aware of no restart in neutral though. That's good info. As is the "tin whiskers" which was a previously unknown phenomena to me.
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  #22  
Old 02-17-2018, 01:52 PM
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https://nepp.nasa.gov/whisker/refere...app-sensor.pdf

NASA was hired to look into a similar tin whisker problem in Toyota gas pedal. There was a whisker that shorted between the two potentiometers and caused a driving problem where the pedal input was ignored until enough pedal was pushed and it would jerk accelerate. The whisker in this case measured 250 Ω or so but it made the off throttle value change by a factor of 15,000 (until manually shocked).

Pos 1 is the on position pos 0 is off. You can turn to off without in park? I am thinking more like position. 0.25 (almost not quite off) but that the engine will shut off.

A key element to learning to drive was learning to shut off the engine of a runaway throttle condition.

Ignorance is to blame of the situation getting out of control.

The chance of a runaway throttle is of course the worst case of fly by wire throttle but I'm quite sure the engine could have simply been turned off then the throttle position sensor can be sent to NTSB / NASA (used I'm sure because they have been allowed exception to using lead-free solder due to tin whisker problems).

In the failed camary I think they said the X-ray shows 17 tin whiskers just that one or two actually caused the problem.

I'm curious about just riding the brakes since I'm pretty sure my engine cut power when I was at part throttle and brakes. That may not happen when full throttle though.

The silver lining here is that everybody reading this thread who at least learn the proper methods to get the car under control

Oh: more likely the cause was improperly installed floor mats. About 90% of the time a "stuck throttle" situation either or to be improperly used floor mats.

9% chance tin whisker and 1% chance the driver was just holding the pedal down and lying. (15 minutes of Fame)
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Old 02-17-2018, 01:54 PM
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BMW's response:


“All BMW vehicles, including the 2003 X5 described in this incident, employ an electronic accelerator pedal which uses software logic to override the accelerator whenever the brake pedal is pressed while driving. This fail-safe software means that if the vehicle detects that both pedals are depressed, the on-board electronics will reduce engine power so that the driver may stop safely. … We would be happy to work with the Florida State Police to investigate the cause of this incident,”


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Old 02-17-2018, 01:56 PM
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So there would have to be additional problem such as the brake pedal switch also broken so not feeding into the computer that the brake was pressed. The article in the Miami Harold says that 911 tired to have the guy cut the ignition which clearly was not done.


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Old 02-17-2018, 07:17 PM
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Anyone See the Runaway X5 in Florida Story?

Okay so I tested both the ignition key off that works perfectly fine. And from about 60 miles an hour I kept the throttle on while I braked down to zero and as I got to about 30 miles an hour actually started increasing throttle.

I came to a complete stop with full throttle and braking only like half power. The engine and transmission was confused it did not love it. The RPM stayed between two and three thousand RPM the whole time.

It was the downshifting under attempted Full Throttle that made me say I don't think the transmission loved it.

Summary of the system did work perfectly fine it didn't just shut off the engine the engine kept trying to accelerate the car but it gave up trying just enough that I could actually stop.

Unless something else was broken on the guys car like the brake stop switch so the computer didn't realize the brakes were being applied total BS
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Old 02-17-2018, 09:51 PM
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If your NOT in PARK...you can't turn the ignition to the OFF position (which would lock the steering wheel)...so there should be no issue cutting the engine off by turning the ignition to position 1 or 2 which would kill the engine but still allow you to steer the car.
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