Check Engine Light: 1988 420 SEL California Emissions

05-02-2005, 01:38 AM

Jim Dandy

Cat Herder

Join Date: Nov 2003

Location: Oklahoma

Posts: 157

Check Engine Light: 1988 420 SEL California Emissions

The CEL came on my '88 420 SEL on my way in to work tonight as I was accelerating to get on the highway. Car still runs smooth, but has a fairly high idle (about 1200 RPM). I'm getting a DTC of 3, which I'm assuming is the EA/ISC. Is that correct? Once the car cools down and is restarted, the idle is fine. As it warms up, the idle begins to increase.

The car is a California model and has 131K miles. No other codes are set.

Any idea what could be causing this? TIA.

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