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Re: "Sluggish" 4.0 Explorer
Electronic transmissions don't need 'kickdown', modulators, or any other
round-about tricks to sense throttle input and engine load. Instead of
having their own hydraulic 'brain', they are controlled directly by the PCM
(engine computer). That box knows as much as can be known about what your
engine is doing, how fast you are moving, what the temperature on the moon
is at the moment, etc, etc. Well, a bit of exaggeration, but you got the
idea. All that works as long as the sensors are functioning correctly. But
typically when they don't, the CEL turns on.
The sluggish acceleration sounds like a transmission problem, but it could
easily be ignition. If this vehicle still has ignition wires (not
coil-on-plug) I would start there. They are notoriously difficult to test
without an oscilloscope and known to fail, sometimes very early. It's
probably a safe bet to replace them on 6 year old vehicle, just as a
precaution. Taking a look at the plugs couldn't hurt either.
"mike" <hillmw@charter.net> wrote in message
news:1133907158.948923.247120@g49g2000cwa.googlegroups.com...
>I'd be interested to know what system has replaced the kickdown mechanism
on
>earlier auto trannys? I think the truck 'doesn't realise' that I want it to
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