High Idle 1989 420 SEL - Solved - PeachParts Mercedes-Benz Forum

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High Idle 1989 420 SEL - Solved

11-20-2004, 06:52 PM

Cigar Havana Cigar Havana is offline

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Join Date: Jan 2003

Location: London Ontario Canada

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High Idle 1989 420 SEL - Solved

On a 1989 420 SEL, I had a high idle after the engine warmed-up. The idle was 1,000 RPM after warm-up. On start-up it was 800, but after a 40 min. drive, of which 30 min. was at 100 KPH, the engine would idle at 1000 rpm in neutral.

Problem was solved by replacing the idle control valve. Now the idle in neutral is 650.

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1989 420 SEL

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