5.2 RunningProblems with the way the engine runs may be caused by either ignition system or fuel system faults. The fuel injection system is far more likely to be influenced by temperature. Symptoms which are present only when the engine is cold, or only when it is warm, tend to suggest fuel system problems. For gasoline engines, the ignition system should be investigated and confirmed to be in good condition prior to beginning any work on the fuel system. For troubleshooting diesel engine running problems, see the fuel system troubleshooting information in FUEL SYSTEM (Diesel). For an engine which has recorded a high number of miles, the general mechanical condition of the engine may also be a factor. Particularly in cases where running problems have developed slowly over time, troubleshooting should include evaluation of the engine's mechanical condition with a compression test. See ENGINE. When attempting to evaluate noise or vibration problems which exist when the engine is running, try to eliminate other possible causes. With a manual transaxle, if the symptoms change depending on whether or not the clutch is engaged, the problem may be in the clutch disc, the clutch release mechanism, or the transaxle. See MANUAL TRANSMISSION AND CLUTCH. With an automatic transaxle, check for the symptoms in different shift positions. If the symptoms differ, the problem may be in the torque converter or the transaxle. See AUTOMATIC TRANSMISSION. |
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