introduction/jerking when pedal slowly depressed
- Hi, everyone. I recently bought a 1998 Force from Tim Baker and Mike
Montgomery, who got it at auction from the State of New York. Now my
Force is at Solectria (Azure) where everyone is puzzling over the
If you slowly depress the accelerator, instead of slowly moving
forward the car gives a forward jerk and then a backward jerk, and
continues to do this for a while as you slowly depress the pedal.
Eventually it starts moving forward. If you just push down on the
pedal quickly it moves fine. The worst example of this problem was
trying to get off the tow dolly at Solectria. I slowly depressed the
pedal all the way to the floor without the car actually moving out of
the depression on the dolly.
There's also a problem in regen. Going down a hill without my foot on
either the accelerator or the brake the car shudders back and forth
and the brake lights flash on and off.
Solectria has already tried replacing the speed sensor, including the
wheel, replacing the controller, and operating the car with some
remote control device that replaces the potbox and I think the
"ignition box". Grounding problems have also been checked for. Kevin
at Solectria reports that with the emergency brake on and the back of
the motor off you can observe the motor turning about half a
revolution backward and forward.
Solectria's best idea is that the problem is excessive play in the
transmission, and would like on the order of $500 to take the
transmission apart to check for problems. I wouldn't mind paying
that much to have the problem fixed, but I'm reluctant to pay for
nothing, and at the moment I don't have a credible explanation of how
the play causes the problem.
Has anyone seen anything like this? Is there some reasonable
explanation for how a transmission problem would cause this