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I have a 1995 9000 Aero with about 57,000 miles that recently developed an unusual problem. After stopping at a convenience store upon restarting, initially the car staled a few times, the car's throttle responded unusually, it was stiff and as it was depressed it became stiffer before reaching the floor. The pedal was so stiff that it felt like it was floored. It was possible to pass through this midway point by applying substantially more force that normally require to depress the throttle and drive that car. Additional symptoms included the air conditioning cutting out on at least one occasion. I brought the car to my mechanic who performed a battery of diagnostic test. After a day he told me the problem was that the traction control system (TCS) was sensing a fault and that he did not have the diagnostic tools to identify it and that I should take it to the dealership. This seemed consistent with posts on this board by other owners who had similar problems. However, when I picked up the car I noticed something I had overlooked before. It was idling roughly and on shifts you could hear a faint whooshing. Leaking vacuum line? The same day I took it to another mechanic and he diagnosed a leaking vacuum line leading to the manifold. He replaced the line and reset the computer, which due to the leak had put the system in "limp mode". Problem solved. He also told me that these cars are very sensitive to vacuum leaks and that when one happens it shuts down the electronic throttle control and puts the car in "limp mode". The moral of the story is a stiff pedal may not be related to a TCS system fault and replace all the rubber vacuum lines with silicon lines. Rubber degrades due to time and heat, silicon last much longer.
posted by 65.59.61...
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