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MB 420SEL 1986-Bought in 2010, MERCURY VELLAGER-1995, NISSAN MAXIMA 1996, Buick Lesabre 1995
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426 Posts
any ideas on why the 420 suddenly developed a high idle.
Time to smoke cigar and do smoke test to diagnose vacumm leak.

Cheers.

Sahai
 

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1995 E320 (totalled) 91 420SEL W126 (retired) 2002 S500 W220(retired); 2008 C300 Sport W204
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662 Posts
I agree. Probably a vacuum leak or the Idle control valve failed completely.
 
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