91 Mercruiser front 2 cylinders not firing

Joined
Jun 24, 2011
Messages
8
Im going nuts here!!!!!!!
Took the boat out on the water today, running great and then NOT. It sounded like some one just unplugged a couple of my plug wires???? Took the thing out of the water brought it home and started testing. While the boat is running i pulled off the front to plug wires and no change. so i replaced the plugs . Still nothing. Pulled the wire put another plug on it fired the boat it has spark but weak. The back to cylinder are firing great, good blue spark. Compression is 150 in both of the cylinders. Any help would be great. If i cant fix this i think im gonna pull the plug and give lake ontario a new reef. HAHA.

Jesse:mad::mad:
 

dubs283

Vice Admiral
Joined
Jul 27, 2005
Messages
5,343
Re: 91 Mercruiser front 2 cylinders not firing

have you looked under the cap??

maybe some corrosion or other issue there
 

NHGuy

Captain
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May 21, 2009
Messages
3,631
Re: 91 Mercruiser front 2 cylinders not firing

If the cap & rotor are OK put on replacement wires.
 
Joined
Jun 24, 2011
Messages
8
Re: 91 Mercruiser front 2 cylinders not firing

I replaced the wires and it still did it.. im gonna get a cap,rotor, wires and points and see if that helps. it was just odd that it happend that quick

Jesse
 

Pete104

Lieutenant
Joined
Apr 30, 2011
Messages
1,439
Re: 91 Mercruiser front 2 cylinders not firing

What's compression on the 2 that aren't firing?
 

Bondo

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Apr 17, 2002
Messages
71,389
Re: 91 Mercruiser front 2 cylinders not firing

Ayuh,... It'd be Nice if We knew WHAT Motor yer workin' on....
 
Joined
Jun 24, 2011
Messages
8
Re: 91 Mercruiser front 2 cylinders not firing

Does anyone out there have any advise as to what could be causing this!!!!!
Jesse
 

dubs283

Vice Admiral
Joined
Jul 27, 2005
Messages
5,343
Re: 91 Mercruiser front 2 cylinders not firing

Does anyone out there have any advise as to what could be causing this

did you look under the cap??

perform a tune-up??

you have been given advice, we can't tell from where we are if you have performed any troubleshooting or repairs
 
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