This may be a result of an action caused by a deceleration limiter which is
an emission control device used to keep the throttle from closing completely
during deceleration. I know if I hit the gas hard on my 99 R/T and then let
off quickly the engine keeps pulling or so it seems until the speed drops
below a certain speed and it you shift to neutral it revs up even though my
foot is not on the accelerator at all. This might be a similar action but I
can't explain any better.
----- Original Message -----
From: <Sammon287@aol.com>
To: <dml@dakota-truck.net>
Sent: Wednesday, August 28, 2002 4:59 PM
Subject: DML: runaway idle speed on 2000 slt+
>
> My 2000 SLT+ 4.7L/ 5 speed has an annoying problem when venturing
offroad.
> It has done this since new, but since I rarely hammer the truck offroad, I
> have ignored it until now. When driving on a rough dirt road scattered
with
> small rocks, it feels like the cruise control kicks in, actually
accelerating
> up to 1500-2500 rpm. Stepping on the clutch lets the engine rev up to
> @2500rpm, which slowly drops as I come to a stop. Standing on the brake
does
> nothing to drop the engine speed, as it accelerates again as soon as I
> release it. Remember this is a man trans. I imagine this must be caused by
> some sensor/ throttle body actuator that is affected by vibration. This
would
> be a major safety issue if it was an automatic, but even with the manual,
it
> is impossible to drive smoothly on rough roads. I am reluctant to go to
the
> dealer (been there several times in 2.5 years) because they will never be
> able to recreate the problem. The truck wheels well at low speed (low
> gearing, LSD, and decent rear axle flex) as long as there is no high
> frequency vibration.
>
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