spark 1976 mercury

R

roadlooker

Cadet
Joined
Jun 30, 2011
Messages
15
does any one have a idea why on a 1976 mercury 85 hp that the top two plugs would not be getting fire bottom two have great spark each cylinder has 140 psi help
 
W

water world

Petty Officer 3rd Class
Joined
Dec 9, 2011
Messages
81
Re: spark 1976 mercury

check ground wire under coils. can cause problem takes out switchbox
 
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