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2002 merc 115hp 4 stroke idle problem


w1w

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Is it carburated or injected? If injected prolly a module or sensor of some sort. If carburated could be deposits in carburated from sitting over the winter. First time you ran it this year?

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...EFI...yes, first time running but idle was a problem last year, too. At idle, it will stall after awhile (6-800). When I engage in forward or reverse, I have to give extra throttle to get the rpm's up and then the motor runs fine at higher rpm's...

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Buddy had a similar problem on his. 2010 merc 115hp. Needed a module of some sort. Can't remember which one . He ended  up bringing it to a marina after trying a few things himself. Was in the middle of walleye season last year! Lol

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...thank-you...

13 minutes ago, shoemaker said:

Buddy had a similar problem on his. 2010 merc 115hp. Needed a module of some sort. Can't remember which one . He ended  up bringing it to a marina after trying a few things himself. Was in the middle of walleye season last year! Lol

...thank-you, cobbler!

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...so, I removed the fuel injectors and cleaned them. I had already replaced the plugs. I purchased them (4) at Advance Auto in Buffalo for $20.83CDN. The same plugs over here at a local auto supplier were $9.99 each plus tax and not in stock. I'm not advocating buying in the US,  just stating facts. The possibility of the injectors being plugged does exist. There is a solenoid in each injector which when engaged  (electronic fuel injection...EFI)) causes the injector to spray/mist gas thru 4 minute holes. The one injector did not appear to be spraying, correctly. The cleaning process seemed to make it work, correctly. See utube for directions on how to make something to test/clean your injectors. You'll need a can of choke/carbeurator cleaner and you'll need to pressurize the line. Much easier with 2 people when you're testing. However, as much as that may have helped. I found an idle speed control screw on the port side of the motor. It's right about in the middle on the outer side. If you look from the stern, you'll see it. There is a plastic cover over it so you will have to use needle nose pliers and a small turn makes a big difference (in my case). I was using 'ears' in the driveway to run the motor. Adjusted the idle to 800 rpm's and it is idling fine, now. Took the boat out in the Upper and the adjustment didn't affect normal performance at higher rpm's. Clean injectors at your own risk. Hope this helps someone in the future. School's out! 

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Thanks for that info !  Do you use Sea Foam , Star Tron , or any other additive to the gas ?  And what octane gas have you been using ?  All this talk about ethanol lately makes me wonder if it causes problems with injectors on outboard motors .

I have a  2005 ,   50 Merc. 4 stk. EFI .....

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...with all the products out there, it is confusing. I had to get some very small diameter siphon hose during this adventure to get some gas out of my boat tank. I'm getting to your question. The gas seemed like it had just come out of the pump. Was that, in part, because I religiously use Stabil 360 Marine? Don't know. I had a bass boat for 4 years. Sold it a couple years ago. Bought it in Florida from a friend. It ran fine on the Big 'O' when I tried it. Got an 8lb. largie that day, too. Got the boat back to Canada and put it in at the Parks Marina. Wouldn't start. Took it to Grand Island to a marina. They cleaned the carbs, put in new plugs AND told me the gas was bad. Had to siphon around 18 gallons...a real pain. Never had a problem for the 4 years I owned it after getting rid of the old gas. At the marina, there was a jar of ethanol gas sitting on the counter. It had separated into layers over time. I think I actually asked what was in the jar. A pro suggested the Sta-bil (long time ago) and I don't think I have had any performance issues due to ethanol but the possibility exists that your injectors can plug up. Is that partially due to ethanol? I use Wynn's from Walmart...injector additive...3 pack. Does it work?...don't know. Does it hurt...don't know. Researching (google) an injector additive might be a good idea. Maybe, I should take my own advice. Does anyone out there use an injector additive with confidence?...

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Seems that you're running fine now but a clogged/dirty fuel filter is always a first check for me. I had a similar issue with my 30hp Mercury 2 stroke a couple weeks ago. Hard start when cold and would stall when putting her into gear when cold. Once she warmed up all was good. Changing the plugs was an easy fix for that issue.  

 

I would add that much care needs to be taken when increasing rpms while putting the motor in gear. It would be a be easy to damage the lower unit if you give too much throttle in order to keep it running. 

 

 

 

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She'll 91 v power is ethenal free and run a fuel stabilizer in it. He is my logic better to spend a little more now to keep engine running like a top then spend thousands later fixing or replacing.

As for your motor man getting stranded out on the lake is not fun especially if your out near dark and you can't get back. If I were you get it checked by a specialist so you have no worries and after that do your regular maintanance.  

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My Merc 200 four stroke is only 4 years old and to date I have had no problems. I use regular unleaded from the major brands but occasionally I do top up with high test if I know the boat will be sitting idle for some time. I also will put in as much premium as I can afford before winter storage and only then do I use a stabilizer. As for buying fuel, I am sometimes leery of small northern lakes marinas as they only sell a fraction of the fuel that road stations do and I question how fresh the fuel is and the condition of their tanks. As for oils etc., I am a firm believer in using only the products marketed by the engine manufacturer. I have been doing this for 40 plus years and have never had a problem. My Dad was using CTC 2 stroke oil in his new 35 Evinrude (he used all of 2 cans a season) because it was cheaper. When he had a problem under warranty and it had to go back to Peterborough, they told him immediately on opening it up that he was not using OMC oil because of the residue found on the rings. I am sure there are some excellent off-brand products out there but we don't know which ones they are. I wonder how many engine rebuilds Walmart has paid for because their cheaper lubricants are not up to the task. Mercury, Yamaha, etc. have a vested interest in their products and want their customers to be satisfied. We are not driving our boats to work everyday so the little bit extra we pay over a season is well worth the peace of mind and possibly, the better performance.

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On ‎5‎/‎3‎/‎2018 at 10:07 AM, verado said:

My Merc 200 four stroke is only 4 years old and to date I have had no problems. I use regular unleaded from the major brands but occasionally I do top up with high test if I know the boat will be sitting idle for some time. I also will put in as much premium as I can afford before winter storage and only then do I use a stabilizer. As for buying fuel, I am sometimes leery of small northern lakes marinas as they only sell a fraction of the fuel that road stations do and I question how fresh the fuel is and the condition of their tanks. As for oils etc., I am a firm believer in using only the products marketed by the engine manufacturer. I have been doing this for 40 plus years and have never had a problem. My Dad was using CTC 2 stroke oil in his new 35 Evinrude (he used all of 2 cans a season) because it was cheaper. When he had a problem under warranty and it had to go back to Peterborough, they told him immediately on opening it up that he was not using OMC oil because of the residue found on the rings. I am sure there are some excellent off-brand products out there but we don't know which ones they are. I wonder how many engine rebuilds Walmart has paid for because their cheaper lubricants are not up to the task. Mercury, Yamaha, etc. have a vested interest in their products and want their customers to be satisfied. We are not driving our boats to work everyday so the little bit extra we pay over a season is well worth the peace of mind and possibly, the better performance.

I have a new 3 pack of Wynn's injector cleaner. Your advice has convinced me to take it back to Walmart and search out the Merc comparable product...makes sense. Thank-you.

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You can't honestly believe that a Merc product is any different than a non Merc product.....as we know that they don't make oil and lubricants etc.  They just set specs and have their sticker put on it.  Those specs are the same as what other manufacturers have to also produce against.  Whether it be for small water craft or oil injection systems.....etc.etc.  $ $ $....  My warranty is up on my Optimax.  Time to use Pennzoil marine premium plus without the premium price for my oil injection.

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You're absolutely right Lundtastic. All I'm saying is that if you have a problem and you can return to your dealer and say look, I was only using Merc, Yamaha , or whatever in my engine as recommended by the manufacturer and I had this problem, they cannot immediately say oh you caused the problem by using products not specified in your manual. Once the warranty has expired it is a different ballgame. I agree that Pennzoil premium is an excellent lubricant but once again, with the amount of hours most of us are fortunate enough to put on our boats in a season, I will gladly pay the extra $50-$100 required to use the manufacture's product 

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