94 E-320 idle problem - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 02-18-2011, 03:27 PM Thread Starter
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Date registered: Feb 2011
Vehicle: 1994 E-320 Sedan
Location: San Antonio, TX
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94 E-320 idle problem

Hi. I have a 1994 E-320 which recently started having an idle issue when at operating temp.
Quick time line: My Ce light came on about 4 weeks ago. Was told it was the upstream O2 sensor. Didn't repair immediatley. About 2 weeks into the CE light being on my engine started to have the idle problems. The idle is fine during the first 5-10 minutes of operation.
At an idle the rpms will increase to just above 1K then quickly drop below 500. This will repeat several times and if I don't start moving again the engine will eventually die.
I just replaced the O2 sensor and still having the same problem.
Any ideas would be appreciated
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post #2 of 2 (permalink) Old 02-18-2011, 05:44 PM
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