Kenneth Waller wrote:
We're not talking about the same phenomenon. You use the term surge -
generally interpreted as short duration & slight to moderate acceleration.
The typical sudden accel event that I've been involved with is a longer
duration event that appears to duplicate a wide open throttle event &
most times is purported to not be controllable with the brake application.
With the fuel injection systems that I'm familiar with the throttle body
acts as an air valve, which is controlled by your right foot. Fuel is
controlled by the engine processor & is added to the combustion process
based on the position of the throttle. Air, fuel & spark must be
combined at specific ratios for correct combustion to be obtained. Too
much fuel & the engine runs rich & doesn't produce optimum power. Too
little fuel & the engine runs lean & doesn't produce optimum power.
Additionally, what you're talking about is taking place outside the
combustion chamber. I don't see how that has anything to do with the
production of engine power.
Kenneth Waller
The fuel has to go through the engine to get to the cat, so will affect
power output. The stoichimetric ratio is an ideal, probably never
achieved in practice throughout the combustion chamber, so extra fuel
could produce more power. There were definite power surges without any
throttle application by me, in situations where I could believe the cat
was not at proper temperature. The cause was given to me by the
Automobile Association patrolmen who attended. They had, at that point
in the early 1990s, had numerous calls about the problem.
The surges were not severe but they did produce secondary adrenaline
surges when they occured in close traffic.
m
----- Original Message ----- From: "mike wilson" <[EMAIL PROTECTED]>
Subject: Re: Re: OT: HCB with a Minolta CLE
From: "Kenneth Waller" <[EMAIL PROTECTED]>
Most major auto manufacturers have been sued with sudden accel as the
allegation.
I've experienced this with a couple of vehicles. As far as I could
ascertain, it was a function of the fuel delivery system to deliver
excess fuel if the catalytic converter temperature fell below a
threshhold. The unburnt fuel reacted in the cat and raised the
temperature - a byproduct was a small surge in acceleration, rather
like the one you feel when the injectors kick back in on the overrun
to generate idle speed but much more prolonged and at any throttle
opening.
mike
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