Unintentional consequences

The Toyota "sticking accelerator" incident reminded me of the recent report about a family on a USA freeway who were unable to stop their car. Eventually, all were killed when the car crashed, and another report about a stuck cruise control unit that had similar tragic consequences. Info can be found on the net about these incidents. Surely, switching off the ignition would kill the engine to regain control - or would it? The family in America reportedly made distressing calls on a mobile phone requesting help to no avail. Are we driving about in vehicles that have the potential to become totally uncontrollable - and is there a difference in the likelihood between diesel and petrol units? As a former fire officer I attended several diesel engines revving out of control. The way we dealt with them was to discharge a carbon dioxide extinguisher into the air intake to stop the fuel combusting.

Asked on 1 May 2010 by M.J., Oxford

Answered by Honest John
I cannot understand how a driver could make a phone call from a car to tell people his car was out of control rather than try to find a way to control the car. I simply don't believe that he could not control the car. A recent Sunday Telegraph ran a story about how a man stopped his car at the top of a cliff to admire the view. Then he “unintentionally” accelerated over the cliff and killed his wife. Unless conclusively proven otherwise I think he had been taught or got used to driving his automatic one-footed and hit the accelerator instead of the brake. That's why I exhort all automatic drivers to drive two-footed, right foot on the accelerator, left foot over the brake, especially while manoeuvring, so there can be no confusion. Diesels rev uncontrollably either when the turbo oil seals fail and sump oil is siphoned into the combustion chambers, or when the sump level gets too high due to failure of one type of diesel particulate filter regeneration system. However, even then an automatic can be taken out of ‘drive’ so the consequences need not be dire.
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