Originally Posted by
Crow13
Am I ringing any bells? Anyone have a similar condition?
Crow13
Yes. My last two Roadsters, both manuals, have a WEIRD glitch in the ECU software. Goes like this:
Start car and drive for 1/2 hour or more.
Pull over. Shut the car off and sneak into the weeks to quickly answer nature's call or throw trash into a roadside trash container.
GEt back in car, start up and head down hill right away.
As you take your foot off the gas to coast, the throttle plate will vary in it's setting as the ECU tries to understand why the engine is speeding up.
The ECU will soon not only open the throttle plate, but start to widen the pulse on the injectors, adding fuel, and the car will accelerate away from you.
You CAN NOT stop this other than pushing clutch in (engine will speed up to 4100 rpm and sit there) or turn key off.
Turning key back on, in about 200 feet, the car will do it again.
Once you get to flat ground, all is OK.
If you DO NOT stop before descending the hill, there won't be any problem, it's on startup of a hot engine only.
Only two others on this forum have reported what I describe. The downgrade must be rather STEEP to make it happen and the car must be a manual.
Originally Posted by
Crow13
I think there must be a fault and then a re-set in the ECU or something like that.
I totally agree.