2003 Mercury 150 XL Saltwater wont idle - idel is low 650-700

Larryob10

Recruit
Joined
Jul 2, 2018
Messages
4
I have a PROLINE 20 WA with 2003 Mercury 150XL Saltwater - did you get a repair manual PDF?
 

Larryob10

Recruit
Joined
Jul 2, 2018
Messages
4
Help - Just came back from the shop - plugs, timing trigger, carbs cleaned, fuel system cleaned and went from 20 micron to 10 micron fuel separator - it Idles at 650-700 should be 800 RPM, can I manually adjust it to 800?
 

ThomW

Chief Petty Officer
Joined
Aug 8, 2016
Messages
615
Yes. But adjusting idle is best done in the water.

Image result for merc 150 outboard idle adjustment screw

Looking at this picture, your idle adjustment screw will be the one that looks almost hidden behind the hose coming from fuel filter. The one right below the screw with orange lock tight all over it.

Let motor warm up, then turn that screw until the idle raises up to your desired rpm's.\

Hope this helps.
 
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