XPost: rec.autos.tech
On Wed, 27 Jan 2010 21:22:22 -0700, Ashton Crusher
wrote:
>On Wed, 27 Jan 2010 20:52:39 -0500, clare@snyder.on.ca wrote:
>
>>On Wed, 27 Jan 2010 12:19:55 -0500, "Mike Hunter"
>> wrote:
>>
>>>You mean like cutting off the bottom of the accelerator?
>>
>>Temporary attempt to fix an unproven problem - better than doing
>>nothing, IF it had been the problem.
>>
>>To this point in time there is NO PROOF the throttles are sticking.
>>Much less any idea WHY or WHERE they are sticking.
>>
>>Yes, some cars have "run away" and some people have been killed - but
>>no vehicle has had the throttle stick under controlled conditions or
>>in the hands of a technician who can then determine what went wrong.
>>
>
>Nonsense. They just aired a story of a guy whose Toyota did the
>"runaway" thing several times. The last time it did it he called the
>Toyota dealer and said he was bringing it in and he did (by shifting
>it in and out of gear as needed) and left it running for the tech to
>look at. The tech verified that the throttle pedal was not stuck on
>anything or sticking but the engine was racing and would not stop till
>they shut the car off. Toyota KNOWS this is a REAL problem, not some
>confusion on the customers part, or they would not have stopped
>selling cars.
Well as a mechanic I find that extremely unlikely - if the PEDAL is
not stuck, and the LINKAGE is not stuck, there is NOTHING that can
cause the throttle to stick that would not be possible to remedy, or
at least determine, without shutting the car off. The IAC does not
have enough authority to cause a run-away - it can only cause a fast
idle.
Anything (except on drive-by-wire) that would cause runaway would
still be there when the engine is restarted.
If it was a diesel it would be a different story because a diesel is
not throttled and something as simple as a leaking transmission
modulator can cause the engine to run fast, and a punctured piston can
cause an engine to over-rev to the point it blows itself up.(and
cannot be shut down by any conventional methods)
Step one - is the throttle against the stop? If not, is the
cable/linkage in tension?
If it is, problem at the pedal. If it isn't, problem is at the
throttle body end. Disconnect the cable. Does the throttle return to
the stop? If yes, cable. If no, throttle body or associated parts.
If the throttle is against the stop, something REAL strange is going
on.
Besides - on this evening's news it was reported that the pedal
supplier is in a tizzy trying to get new pedals into Toyota's hands
and has all their plants working at it.. Wouldn't be doing that if it
wasn't a pedal sticking problem - and the pedal design is apparently
the only thing in common between the drive-by wire and mechanical
throttle vehicles affected. On one it operates a therottle pot - on
the other the throttle body by cable linkage.
Being it is affecting (apparently) both technologies, on several
different engines, there has to be a common element.
The pedal would APPEAR to be that common element at this point.
Big news around here with the corolla plant at Cambridge (virtually
next door) and the RAV4 plant at Woodstock - just down the highway a
short distance. Lots of neighbours employed at both plants.
>
>>VERY perplexing for the engineers, for sure.
>>>
>>>"hls" wrote in message
>>>news:boydnQXttfoAyv3WnZ2dnUVZ_vSdnZ2d@giganews.com...
>>>>
>>>> "Hachiroku ????" wrote in message
>>>>>
>>>>> Instead of 'slowing down' when an error is realized, Toyota stops
>>>>> production.
>>>>>
>>>>> Gm would do well to learn from this. Burning Fieros, CV joints wleded to
>>>>> make a FWD engine a RWD engine, etc.
>>>>>
>>>>>
>>>>
>>>> Mercedes did the same thing a few years ago with that ugly A class
>>>> a few years ago. They stopped sales and stopped all manufacture until
>>>> they got the engineering problem fixed. A lot better move, imo, than
>>>> the bandaid approach.
>>>
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