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Forum: Mercedes-Benz SL Discussion Forum

06-16-2009, 01:14 PM

Replies: 27

All of a sudden reving up and down when cold

Views: 3,490

Posted By GaryF

The idle screw restricts an air passage only, no...

The idle screw restricts an air passage only, no water involved. The AAV is the bit sitting in the water.

Forum: Mercedes-Benz SL Discussion Forum

06-10-2009, 07:05 AM

Replies: 27

All of a sudden reving up and down when cold

Views: 3,490

Posted By GaryF

This isnt a modern idle control valve managed by...

This isnt a modern idle control valve managed by the ECU its a wax filled piston that expands as the water temperature increase and slowly reduces the air bypassing the main throttle. The idle screw...

Forum: Mercedes-Benz SL Discussion Forum

06-09-2009, 12:04 PM

Replies: 27

All of a sudden reving up and down when cold

Views: 3,490

Posted By GaryF

Give the idle screw a tweak clockwise, the idle...

Give the idle screw a tweak clockwise, the idle is too high and the ECU thinks you must be engine braking and is cutting the fuel.

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