1997 mercury mariner 200 efi won't accelerate HELP!

Funny guy

Recruit
Joined
Oct 20, 2013
Messages
2
I have a 97 merc 200 efi last winter we started having an issue with it not wanting to accelerate at times then it would be fine for a while,as time has went on the problem has got more persistent. There seems to be a noticeable miss when it starts doing this, if you idle around for a while you can feel the motor "clear up" and it will take off fine. Two weeks ago it started losing power on plane like it was dropping 2 cylinders, may run like that for 1/4 mile then just take back off like nothing was wrong. I changed the stator but problem persisted, I marked the flywheel and with a timing light noticed it was randomly firing multiple cylinders at the same time so I changed the trigger, boat ran great all day until we started it the last time to come in,and the same problem! To eliminate a few things, we have good compression, spark, and fuel pressure. Could it be a bad efi box?
 

futech

Cadet
Joined
Apr 15, 2011
Messages
16
Re: 1997 mercury mariner 200 efi won't accelerate HELP!

Hey did you end up figuring this issue out?
 
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