Low Speed/High Speed Module

[SeaJay]

My Mercury manual describes a low speed/high speed black box module used on some V6 Mercury outboards. Checking with Mercury Parts Express I find an idle speed module, P/N 87076A 4, called out on the 150 Mercury and a high speed module, P/N 93772A 2, called out to be used on the 200 Mercury but I do not find a module described as a low speed/high speed module anywhere. First question: does the high speed module P/N 93772A 2 also provide low speed (idle) advance in addition to high speed advance? and the second question is: would a high speed advance module be something that would be useful on a 2.0L engine? Thanks; SeaJay

[pirogue]

that's junk you can discard that and time straight to 25* all it's suppose to do is advance the timming 5* i think after 2500 rpms or something like that.

[The Big Al]

module works 2 ways!
When the engine is put into gear it advances the timing 5 degress to help with in gear idle, and when engine gets to 5800 or so(not all are the same) it retards timing
acting like a rev limiter. They are junk! Always have been!
Al

[us1]

The malfunction rate of those boxes is ridiculous. They have burned up many a good motor. Get rid of it. Same goes for the detonation sensor.

[MadTing]

There are two versions of the high speed module: one for the 2.0/2.4L and another for the 2.5L engines.

The 2.0/2.4 version advances the ignition 4 degrees above 5600RPM, for a total of 26 degrees. If the max timing at cranking speed is set greater than 22 degrees, you will fry your motor.

The 2.5L version advances up to 6 degrees at 5600RPM, and retards 4 degrees above 5800rpm.

All the timing advance / retard is electronic and is non adjustable.

Do not use a 2.0/2.4 version on a 2.5L motor or you will definitely fry your motor above 5800rpm.

It can really help a fishing motor that has stock exhaust to idle properly.

[SeaJay]

Thanks for all the input. My motor is a fishing motor and I'll try it without a module and time it accordingly.

MadTing: just in case, I find my motor really needs the help with idling, can you tell me if the module, p/n 93772A 2, is the one you are referring to as the 2.0/2.4 version, which adjusts timing at both idle and at high rpm.

SeaJay