Hey guys,


So my 560 SEL has always had a high idle (950-1000) when in park or neutral, and relatively normal (650-700) in gear.

I drive her this morning, and it does its usual routine, high idle and fine in gear; but I let it sit for I dunno, an hour after driving through New Haven to drop my brother off at school (40 minute commute, tops), and I start back up, it makes this weird gurgling noise, and only idles to 550-600.

I immediately thought something was wrong, so I revved, and it died shortly after.

I start her back up again, and it idles to 550-650-ish. It runs smoothly and quietly, with a little hesitation when I first step on the pedal.

Is there any explanation? I haven't changed anything other than the fact I switched from Mobil gasoline to Sunoco gasoline 3 tanks ago. I put 7.148 gallons of Mobil in this morning in a rush.

It scares me because I'm so used to a high idle that the regular idle makes me question...

P.S. I do have a major tune-up (timing, rotor, cap, sparks, oil, the likes) coming up; I guess I can ask my indy what he thinks (although he doesn't seem to like working on fixing high idles in W126's in general )



Thanks guys,


Carlen

P.P.S Sorry I wasn't able to hunt the issue, I really wanted to help everyone with a high idlin' 560; they all do it...

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1987 560SEL (210,000 miles)