My Xantia has an intermittant problem. Sometimes, at low speed , when I start to brake the engine seems to race and the car starts to speed up. Very disconcerting ! Problem goes away the instant the brake is released and then I can brake normally.
Heard of this before ????
I get that sometimes on small cars, I have large feet and catch the edge of the accellerator pedal ! Some vehicles have a noticeable kick when the air con compressor comes in. Since yours is intermittent I expect you will have to let it develop (as my neighbour says)
doc518 presented the following explanation :
Not that particular car, but ECU controlled cars tend to be programmed to speed up their tickover a bit, whenever the car is moving - could that explain it?
Harry Bloomfield explained on 03/02/2010 :
I just had another thought - Idle Air Control Valve sticking open.
Is it possible that there is a fault with the brake servo than upon breaking it allows air into the vacuum line, thereby increasing the engine speed?
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