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Max Online: 36273 @ 01/23/13 02:34 PM
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#11803643 - 08/29/16 09:02 PM Mercury Opti Max?
The Rodfather Offline
Pro Angler

Registered: 06/17/06
Posts: 997
Loc: Fredericksburg, TX
My dad went fishing the other day and everything was all good until he went to change locations. He said his motor wouldn't run above 2000 rpms, had to idle back to ramp. Any ideas as to what the problem might be?

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#11803680 - 08/29/16 09:15 PM Re: Mercury Opti Max? [Re: The Rodfather]
Bossbowman Online   content
Extreme Angler

Registered: 03/14/05
Posts: 2447
Loc: Hill county
Guardian mode, somethings wrong and the computer is trying to prevent further damage, need to get it checked out.

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#11803821 - 08/29/16 10:53 PM Re: Mercury Opti Max? [Re: The Rodfather]
kevine80 Offline
Outdoorsman

Registered: 11/20/15
Posts: 216
Loc: humble texas
two common problems with optimax

oil tank float bad --replace engine oil tank

overheat at high idle ---place restriction in cooling return line

both problems will put into guardian mode


Edited by kevine80 (08/29/16 11:00 PM)

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#11803842 - 08/29/16 11:28 PM Re: Mercury Opti Max? [Re: The Rodfather]
Wave Away Offline
Outdoorsman

Registered: 04/29/10
Posts: 220
Random but any chance you've got too small of a cranking battery? That threw my opti into a tailspin this spring.

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#11804043 - 08/30/16 07:50 AM Re: Mercury Opti Max? [Re: The Rodfather]
ezbassin Offline
TFF Guru

Registered: 01/15/04
Posts: 12208
Loc: Mansfield, Tx.
This may not be related to his problem but two things that can cause problems and both are inexpensive to fix are : change the fuel filter and make sure your fuel hose and bulb are working properly, holding pressure and not collapsing, thus starving the motor for fuel.
Also make sure the line isn't kinked and free of all obstructions.


Edited by ezbassin (08/30/16 07:52 AM)

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#11804081 - 08/30/16 08:14 AM Re: Mercury Opti Max? [Re: The Rodfather]
ldmtsu Online   content
Outdoorsman

Registered: 02/04/11
Posts: 64
Loc: San Angelo, Tx
Similar thing happened to my 2014.....it was a bad coil.
_________________________
2014 Bass Champs Angler of the Year (South)

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#11804129 - 08/30/16 08:34 AM Re: Mercury Opti Max? [Re: The Rodfather]
206champion Online   content
Extreme Angler

Registered: 02/12/04
Posts: 1608
Loc: Decatur
As stated above guardian mode it could be a lot of things my has went into it a couple of times once when I shifted into gear theres a button(lack of what to call it) that tells the computer or brain what ever you call it its out of idle mine would stick and it thought it was still in idle,and once I hit the rev limiter trying a new prop a couple of time and it went in guardian mode, they can be tricky to find but a dealer can by hooking it up to a fault code machine.
_________________________
www.westforkbassclub.com

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#11804207 - 08/30/16 09:21 AM Re: Mercury Opti Max? [Re: ldmtsu]
squib Offline
Pro Angler

Registered: 01/03/03
Posts: 992
Loc: Lubbock, TX
Originally Posted By: ldmtsu
Similar thing happened to my 2014.....it was a bad coil.


Yep. My guess too

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#11804430 - 08/30/16 11:30 AM Re: Mercury Opti Max? [Re: The Rodfather]
Allen Bass Fisher Offline
Extreme Angler

Registered: 08/05/04
Posts: 1628
Loc: Allen, TX
On my last boat (2005 Cougar w/225 Pro XS) it went into guardian mode when I sucked some sand or gravel up and it stuck one of my thermostats open. One side would reach normal operating temp and the other would stay cold. Triggered the guardian mode. Replaced thermostats and was good to go. Cleaning them probably would have fixed the problem but decided to replace then. Good to go on the next trip!

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#11804882 - 08/30/16 03:39 PM Re: Mercury Opti Max? [Re: The Rodfather]
The Rodfather Offline
Pro Angler

Registered: 06/17/06
Posts: 997
Loc: Fredericksburg, TX
Thanks for the input, the motor is out of warranty but only has 110 hours, hopefully it's an easy fix and not a blown power head.

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#11805429 - 08/30/16 10:00 PM Re: Mercury Opti Max? [Re: The Rodfather]
The Rodfather Offline
Pro Angler

Registered: 06/17/06
Posts: 997
Loc: Fredericksburg, TX
UPDATE!! Dad took his boat in and they ran diagnostic test and it ended up being a bad coil. Thankfully nothing major, he's had a tough go on boats the past few years so this was a big plus. Thanks for the help.


Edited by The Rodfather (08/30/16 10:01 PM)

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#11805539 - 08/30/16 10:51 PM Re: Mercury Opti Max? [Re: The Rodfather]
2 Bee'z Offline
TFF Celebrity

Registered: 07/23/15
Posts: 5789
Loc: Lake Texoma, TX
Outstanding clap

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#11805915 - 08/31/16 09:13 AM Re: Mercury Opti Max? [Re: The Rodfather]
Neches Offline
Pro Angler

Registered: 04/06/10
Posts: 927
Coil is easy to diagnose and change. Anybody with any mechanical ability can do it. Go to auto parts store and get an in line spark tester and test each coil. You can YouTube it.

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