2008 Mercury OptiMax 250 Pro XS Issue

This topic has 9 replies, 8 voices, and was last updated 14 years, 11 months ago by Flyswatter.

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June 30, 2011 at 2:53 pm #417009

JRoberts
Participant

Was fishing a Wed night tourney, made my first run no problem, then made a short 500 yd run. Then when to leave and motor would not get over 2300 rpms. Was not missing just seemed to be bogged down. Any ideas?Thanks,JR

June 30, 2011 at 3:04 pm #417011

btgibson
Participant

More then likely a coil issue, (Merc has a tsb on them) however could be a lot of things! Check fire at coils, check belt on top of engine. How are the fuel lines and bulb?

June 30, 2011 at 3:14 pm #417013

Bass Cat Boats
Keymaster

My first step will be to replace the fuel filter and see if that does anything. Will post from there. JR

June 30, 2011 at 3:43 pm #417015

Bass Cat Boats
Keymaster

An immediate change like that would not be a fuel filter in our opinion. We think you have a gremlin in the spark plugs, ECM or Coil. We would have a technician look at it and the coil ignition drop out test with a DDT would take only about fifteen minutes to determine the failure. Plug and play diagnostics on this one.

June 30, 2011 at 6:07 pm #417017

JRoberts
Participant

Took to dealer. hooked up the ddt. everything checks out… hotfoot linkage? any other ideas? thanks jr

June 30, 2011 at 7:11 pm #417019

fishinjim
Participant

The first time I had a coil issue (2007 pro xs), it did not show up when the tech ran a diagnostic with the computer. He had to manually check each cylinder before finding the culprit coil/driver.Not 100% on this, but I believe it was because the bad coil was still firing… just not at the level it should have been.

June 30, 2011 at 7:57 pm #417022

gchagler
Participant

A lot of times ignition coils will not misfire at an idle or even at higher rpms, it may only be misfiring under a load in the water.

June 30, 2011 at 11:12 pm #417023

Puma Jim
Participant

my money is a coil as mercs are famous for bad coils. Been there done that twice and no faith in mercs. Will go back to yammies soon as I can

July 1, 2011 at 2:00 am #417026

Caldwellj
Participant

I am willing to bet money its a coil. I had the same motor and went through 2. A buddy had the same issues and I have heard others with the same year and HP that had the same. Merc knows about it and most dealers can get you all new coils. If you start it and the coil is not firing right it will run rough. Entire motor will shake.Seen this too many times with the year model. Merc makes the best and strongest motor out there right now. Everyone of the brands has issues at some point. I would still never run anything else. Just my 2 centsJamey

July 2, 2011 at 4:44 am #417028

Flyswatter
Participant

Caldwellj wrote:I am willing to bet money its a coil. I had the same motor and went through 2. A buddy had the same issues and I have heard others with the same year and HP that had the same. Merc knows about it and most dealers can get you all new coils. If you start it and the coil is not firing right it will run rough. Entire motor will shake.Seen this too many times with the year model. Merc makes the best and strongest motor out there right now. Everyone of the brands has issues at some point. I would still never run anything else. Just my 2 centsJameyWell said Jamey. Listen to these guys their advice is well warranted. Good luck to a quick fix.
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