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Old 02-11-2003, 01:50 PM
maheath maheath is offline
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Join Date: Sep 2001
Location: Austin, TX
Posts: 563
Because the O2 sensor doesn't do anything until it's hot. At that point, it supplies input to the mixture correction. The fact that you don't have starting problems and the idle is fine when cold tells me that you should check your 02 sensor.

Start by reading this thread:
Testing the Oxygen Sensor
Mike Heath
1988 560SL Black/Palomino
1988 300SEL Black Pearl/Burgandy
1984 500SEC Anthracite Grey/Palomino
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