Thread: Fluctuating Idle RPM - '87 260E
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Old 08-24-2002, 05:53 PM
suginami suginami is offline
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Join Date: Dec 2001
Location: Southern California, U.S.A.
Posts: 8,538
I've noticed that a faulty Mass Air Meter usually acts up at idle.

If this unit is bad, or if there's a vacuum leak, it can't figure out the correct ratio of fuel to air, so you see the oscillating idle going up and down.
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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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