I own a '93 VR6 automatic which has developed a fault it seems no one can explain. When started, the car will rev up and down continuously between 500 and 1500 rpm. the car will continue doing this until driven over 2000rpm. The car surges during this rev range, like a dog on a leash and it seems the only way to control my 'dog' is to keep it above 2000 rpm where the car functions as normal, although mpg is at best 18 when normally it is 25 mpg. Having taken the car to Rye Mill, the diagnostic check found a fault with the hall sender and possibly the throttle valve. Having replaced the hall sender, throttle valve and air flow meter, I am no nearer to finding the answer to my problem. Incidentally the passenger side window has taken a mind of its own and will go down when the idriver door is opened (?!!) I have been informed this maybe a result of the existing problem. Like a knock on effect. Does anyone have any ideas?
