5.3 DrivingTo track down noise and vibration problems which occur while driving, first try to learn more about the symptom. Does it occur all the time, or only at certain speeds? If the symptom is speed-dependent, the first step is to find out whether it is related to engine speed or vehicle speed. Compare driving in different gears at the same approximate engine speed. A symptom which persists at a certain engine speed or speed range regardless of gear selection suggests an engine or exhaust system problem. See ENGINE or EXHAUST SYSTEM AND EMISSION CONTROLS. For more analysis, try driving the car at the speed which creates the symptom, and then briefly shifting into neutral and coasting. If the symptom continues unchanged, then it is the car's speed which is a factor, and not engine speed. Symptoms which are related to vehicle speed suggest problems with running gear. See SUSPENSION AND STEERING for more detailed troubleshooting information. |
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