chaztuna(at)adelphia.net Guest
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Posted: Sat Feb 18, 2006 6:31 pm Post subject: Fused Automotive alternators was Re: You think alternato |
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Larry,
I work on late model cars of all makes for a living. Disconnecting
the battery also erases all the adaptive learning strategies that the
engine computer has made. This feature allows the computer to
actually "tune" the engine as you drive it. It can compensate for
(within limits) things like a dirty fuel injector, worn spark plugs
and other items. Disconnecting the battery gives the computer a case
of "amnesia". It usually takes about 2-5 miles for the computer to
"re-learn" these strategies.
This isn't a problem on a car with an engine in reasonably good
shape. However, it can be a real disaster on an old, worn out oil
burner. It may run so badly that the owner can't wait for the 500 to
1000 mile re-learn period.
After performing "drivability" repairs, we erase this memory, so
that the car doesn't continue previous bad habits, like poor fuel
economy, learned while a sensor or other item was malfunctioning.
Charlie Kuss
do not archive
Quote: |
<lhelming(at)sigecom.net>
Maybe the warnings about always disconnecting the negative battery lead is a
good one. The bad thing about it is on some vehicles you can lose memory on
some devices. My Boxster for example loses the radio security code and
makes the radio silent. Only way to fix it is to input the radio code,
which in my case meant a visit to the local Porsche dealer.
Indiana Larry
>
> <chaztuna(at)adelphia.net> You think alternators are safe?
>
> At 07:49 PM 2/17/2006, you wrote:
>>
>><capsteve(at)adelphia.net>
>>
>
> Charlie Kuss
> PS Another Ford "fire starter" was their brake fluid pressure sensor
> (on the master cylinder) for 1984 to 2000 vehicles. This sensor was
> wired battery direct, instead of ignition hot. They can fail at any
> time and there have been dozens of auto (and even garage) fires
> caused by this. I had one fail will I was working on an Expedition.
> It burned the feed wire and scared the hell out me!
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