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Location: Northern Illinois | Hi all,
Just bought a new to me Ranger 681vs with a 2001 mercury optimax 135. Engine has 205 hrs on it, I've changed the water/ fuel separator filter. new air filter, lower unit oil new water pump w/ impeller. Motor runs great at and above 1500 rpm, It runs kind of rough when idling in no wake zones and runs rough when in neutral and occasionally cutting out in neutral. The last owner only used it 3 times in 4 years so it sat alot and it had old gas in it about 20 gallons. he said he topped it off before we went for a test run before purchase. I'm wondering if bad gas would cause this, I ran 15 gallons through it with no change. I just added 15 gallons of fuel and some mercury quickleen additive. Any suggestions on what to check next? maybe plugs? or vacuum / intake leak? just looking for some ideas. |
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Posts: 1091
Location: Hayward, WI | New plugs would be a good thing to try. Make sure you start them by hand, they can cross thread easily. |
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Location: Northern Illinois | I will buy some new plugs and try that. Any particular place to purchase? |
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Posts: 1091
Location: Hayward, WI | NGK IZFR5G, make sure you run this plug gapped at .032. Any Mercury dealer should have them. |
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Posts: 1209
| Take a look on the insides of the fuel lines, it is possible even with ethenal resistant fuel lines they are deteriorating I'd wanna look at least. |
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Posts: 1091
Location: Hayward, WI | Also make sure that the motor is running at proper temp at idle. If thermostat is stuck open or something else is preventing it from running the proper temp they can run rough at low speeds. |
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Location: Northern Illinois | Thanks for all the info guys. I ordered 6 new plugs thanks for the part#. I will gap those and throw them in. How would I go about inspecting the inside of the fuel lines And also testing the tstats? Water temps stays around 107 highest I saw was 130ish. |
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Location: Northern Illinois | hey guys i removed 2 plugs from the left side of the engine tonight this is what they look like. is this normal? Also does anyone know how to check the high pressure fuel filter or VST? I also drained all the old fuel from the tank and will refill with fresh ethonol free and be sure to run quickleen next
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Location: Northern Illinois | Also does anyone know what the compression specs should be on this 2001 merc 135 optimax? |
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Posts: 983
| Them plugs needed changed make sure you get exact same Plug number the optimax is very sensitive that plug off 1 number or letter you will have problems and make sure gap on point I think this will clear up your problem you running premium fuel and putting stabile in it to take out ethanol also very important |
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Location: Northern Illinois | Yes I will be putting new plugs in. I have correct part number stated above. Next question is what should I gap them to? Also would it be a good idea to buy a overhaul kit for the fuel pump and rebuild it? Or is there a something that I can clean out in the fuel pump make sure that it is clean and not gummed up. I replaced the fuel filter already. |
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Location: Northern Illinois | Here is a short clip of it running |
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Location: Northern Illinois | I have a short video of it running if anyone wants to see it. Could use some help with ideas on what it might be. I can email it to you.. Thanks for all the help gents. |
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Location: Northern Illinois | got her running like a top now. New plugs, new mercury fuel primer bulb with updated blue hose, Pumped out old fuel and filled with fresh fuel added 10oz of mercury quickleen and 4oz of quickcare. What a difference! thanks for all the help guys its much appreciated. |
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