Hey everyone, have a misfire on #3, 1985 4cyl 75 hp mariner

bambam123

Recruit
Joined
Jun 30, 2013
Messages
1
Hello everyone, how are you,all today. Hope maybe you can confirm what i think may be my problem. I,ve just aquired this motor and havnt made it to the lake yet,, LOL. Motor misses on #3 ctl, intermitantly. doesnt want to idle. cleand carbs first, but they looked real good. also replaced plugs. compression looks great. Decided to check timing and was off a little. also placed timing light on other three plugs and thats when i found no.3 misfire.shows misfire even without boot on plug. what do you think, possibly power pack .Just shade tree mechanic, so please make it sound simple, LOL. thanks for any ideas you may have.I swapped # 3 and #2 coils and plug wires but didnt make any difference.
 

Iceman66

Petty Officer 2nd Class
Joined
Jun 30, 2008
Messages
199
Re: Hey everyone, have a misfire on #3, 1985 4cyl 75 hp mariner

check dva voltage from powerpack,trigger and coil.
 

Faztbullet

Supreme Mariner
Joined
Mar 2, 2008
Messages
15,616
Re: Hey everyone, have a misfire on #3, 1985 4cyl 75 hp mariner

Check trigger wires to make sure not chaffed or insulation falling off. Aslo check spark to see if it will jumpa a 7/16 air gap if so most likely a switchbox....
 
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