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Is it normal for the idle speed of a diesel engine to go up 1100rpm when cold then drop 800rpm after 5 mins?

No, it is not normal for the idle speed of a diesel engine to go up 1100 rpm when cold and then drop to 800 rpm after 5 minutes. This could indicate a problem with the engine's idling system, such as a faulty idle air control valve (IACV) or a vacuum leak. It is recommended that you have the engine inspected by a qualified mechanic to determine the cause of the abnormal idle speed and have it repaired if necessary.
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