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Mercury Marine Outboard Service Manuals -

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1990 Mercury Marine Outboard Models -

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We stock almost every Mercury digital service manual available.

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If the electronic version of the Owner’s Manual is not available for your engine, please contact Mercury Support at 920-929-5110 to receive one. more

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[marie]

I'm still trying to test the stator and other ignition parts (waiting on a DVA) but I'm really starting to suspect this module. My question is this - Can I just remove it and retime for 23-25 WOT or do I need to do ANYTHING else wiring related to jump it out? more

[kathlemith24]

Hey all, I have another post up about low WOT on my 1988 mercury V6 200 and I found lots of old posts that really seem to describe my symptoms -all referring to the "blackbox advance module". However everyone has different explanations of how it works. In my seloc manual it states the high speed advance module will advance timing 6* at 5600 rpm - which I can never get to. so I guess I'm stuck at 19 degrees. Others seem to state that it retards timing UNTIL 5600 rpm. I'm sure different years do different things but my part number is 93772a 2 -this seems to be a high speed module not an idle stabilizer. more

[Hariposter]

Hey I'll try answer a couple of those. before you start raising the engine make sure that water pressure gauge is working. as to where to plumb it to on your motor, cant tell ya sorry (not the piss tube), mine's fitted right up on top of the block for memory. The bias circuit, as I understand it, keeps the 2 switchboxes timed or in sync. When I removed the modules on mine, and didnt know to replace the bias circuit, the thing ran like arse - ignition was a mess. One wire between the 2 switchboxes did the trick! (thanks to help from the guys in here). The module tweaks this bias circuit to advance/retard the timing. if my fuzzy memory serves me well.

[mar868lent]

Good luck getting it sorted. I'd say bringing your prop closer to the surface will make a big difference, but it's definitely a good idea to trash those modules as well. If your water pressure and WOT timing is safe you wont hurt anything. here