Mercury outboard rough idle
Mercury outboard rough idle
Mercury outboard rough idle. The motor starts and idles perfectly Jun 4, 2023 · Common Problems with Mercury 40 HP 2-Stroke Outboard Engines 1. When I go to Half Choke or No Choke, the engine will die. 9hp kicker motor which is connected to a fuel water separator for both motors on the same main fuel tank, ran the kicker started right up cruised around then turned it off tilted it up done go to start my 175 opti then all of a sudden was idling extremely rough and surging and chugging really Aug 12, 2009 · Re: 2002 75hp mercury rough idle I have a 02 125hp, it is a 2+2 and yes it does idle a little rough, because only two cylinders are firing. Mar 11, 2023 · A quick video on Distributor issues. If I crank it at Full Jul 2, 2009 · Motor will idle for 15 to 20 seconds then start getting rough and dies. Smokes quite a bit after idling for 10 - 15 min, like if im trolling. Mar 14, 2016 · I have a 2000 Mercury 50HP carb version. Jun 16, 2009 · Re: mercury 225 efi rough idle Check all of your bleeder lines for tight connection and proper placement. Apart from the idleing problem engine works great. I have replaced plugs. Sep 6, 2006 · I have a 1993 25 hp 2 stroke mercury outboard that has been a wonderful motor until recently. Cold or hot it idles rough. Mar 23, 2015 · Hey Everyone, I need everyone help to diagnose a problem with my 1994 150hp 2-stoke outboard motor. Its an efi so not a carb problem. It starts easy but is rough from the gitgo. WOT runs awesome for any number of hours. . But the good news is, all the common problems that may arise with the mercury product line are easy to fix, and mercury also ensures the highest after-sale service through its wide range of dealers. I have the manual but those sometimes leave out little important things. The engine will will run 5600 rpms wot and has plenty of power. This mostly involves setting the idle mixture screw and idle speed screw. Under syncronising it says to initial adjust carbs to: # 1 set at 1/4 turn out, # 2 and 3 set to 1 to 1-1/2 turns out ( page 2C-9). The motor starts very easily. Jul 22, 2014 · I have a 115-HP 2012 four stroke. smokes like a Nov 21, 2013 · Modern outboard engines have come a long way, whether you’re talking about the now-common four-stroke or modern DFI motors on up to Mercury's biggest 600-HP power plant. Fuel Injection Issues Cause an Outboard Motor to Die at Idle. BUT under the carb section ( page 3B-6) it says to set to 1-1/4 out for all three. May 31, 2021 · My 1995 90hp Mercury 3 cilinder has a rough idle. Mine did the same thing and I had to rework my bleeder lines and injectors. Every tang was improperly set causing a shortage of fuel/oil to the cylinders Faulty Idle Bleed Recirculation System: Usually, a clogged or stuck check valve, or clogged or leaking hose. If I try to go above idle, motor will die. Seafoamseemed to clear that problem up but included it in case it is pertinent to thecurrent issue. I have replaced fuel filter. I put in a tee in the hose from the IAC to the intake cowling and put a small hole (about 1/8") in the tube to always allow some air. Idle is set with the idle screw on the spark advance arm. I am not a marine engine mechanic but this is a fix that Oct 10, 2008 · Re: 2006 Mercury 60hp bigfoot 4-stroke running rough I replaced the IAC and nothing changed. Sep 10, 2020 · Find and Fix your Outboard fuel system problems. Spark plugs always look wet. 1992 Mercury 200 H. Aug 31, 2020 · The manual states that idle is 675 +/- 50. Jul 20, 2010 · I have a 2002 90HP 2-stroke Mecury Outboard that runs smooth after 2,300 RPM, but misses, smokes, idles rough to beat the band at idle and at trolling speeds. Thread starter Starts great and fast, but has a rough idle and runs rough. However, like any other mechanical device, Mercury 4-stroke outboards might face occasional problems that require troubleshooting and fixing. This may not be an issue since the fuel is pulled from the bottom. It sounds fuel related. It starts "ok" but has a rough idle and at idle it sounds like it's running on one cylinder but I'm told by the mechanic both cylinders have fire. Stalling and rough gear change has also been reported due to I Jun 23, 2008 · Re: Mercury 2 Stroke 50hp Won't Idle For everyone who might have this problem, I thought I would share the solution to the problem. I have decarbed the engine with power tune, run two cans of sea foam, changed the plugs, had the timing checked. It's completely crazy. Thank you so much to everyone who replied to this thread and helped me through this project. To ensure its continued peak performance and longevity, every component must work seamlessly, including the often-overlooked gear lube. It dose not take much to cause an idle problem. Has fresh plugs and fuel filter. I tried to restart several times and the engine revved extremely Apr 12, 2011 · Ran the motor on the cups and found I was chasing the idle and air/fuel mixture screw too much. . Now the engine will respond to me placing my hand over the #1 cyl intake. Feb 3, 2016 · 2007 90 Hp Optimax Idles rough then dies within 5-10 seconds, restarts right back up with same results. To answer both above. So I think I'm on the About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright 8. I have a mercury optimax 200 year 2006. It runs at idle fine. Jan 4, 2010 · "some one please help? I have an 02 115 mer 4 stroke. Doesn't sound like much of a problem, but it makes it nearly impossible to quickly bump it in and out of gear for fine boat control for docking or working around a snagged line. It idles very rough after startup and stalls or sometimes hesitates during acceration and stalls during fast deceleration. It will crank up fine with Full Choke & idle great, but a little rough. Motor runs OK Nov 3, 2016 · These idle mixture adjustment tuning procedures apply the Mercury outboards manufactured between 1965 thru 1989—specifically 45-HP to 115-HP models. We just rebuild both carbs and replaced the plugs, it is running OK, but I still do not think it is running at its best. Jun 15, 2010 · My 2002 f115 stalls when throttling back to idle. It seems to happen at every trip. A rough idle on your Mercury outboard engine could be caused by several factors, from dirty fuel to worn spark plugs to an issue with the carburetor or engine compression. 1984 Mercury 150 hp XR2 rough idle. I did this while connected to a hose and running at 2300 rpm. It still idles a little rough but a huge difference. Jul 10, 2011 · I have a 40 HP Merc EFI 4 stroke bigfoot. I bought the boat and Jul 4, 2013 · Re: 1988 Mercury XR4 (150hp) - Idle Problem The engine should idle without a problem. I think I get 35mph with a 14. Hard starting and rough idle can be caused by a lot of things. It almost sounds like one of the cylinders is not firing. Motor: 6HP Mercury 4 StrokeBoat: 1 Outboard Stalls When Idling. Once it is running it has a rough and shaky idle up to 2500 rpms, after that it run much better. Jul 23, 2022 · In today’s article, let’s explore and learn more about the 5 most common issues that you might encounter with Mercury 115 Pro XS outboard motor-1. If your outboard stalls whenever you drop it into idle, the problem usually lies with the carburetor. At high rpm's it runs fine and never gives me a May 11, 2011 · Re: 1999 Mercury 90 HP 3 CYL no power & rough idle Replaced the upper seal. When I first hit the water, it starts up great, idles in gear and in neutral great. I did notice that the level of fuel in the filter is only 1/4" above the bottom of the filter. These can manifest in various ways, such as poor performance, stalling, or a rough idle. I had the same type of problem and turned out to be the idle jets. If that is good, the it is probably your injectors, water or dirt. Thank you for the response. A rough idle on an outboard is generally caused by a failed spark plug, a clogged or stuck open fuel injector, a clogged or dirty carburetor, or an engine that has an issue with the timing when dealing with a 2-stroke outboard. Jan 12, 2013 · Re: 09 mercury 60hp 4stroke running rough at low rpm. This engine Stalls on idle. I have had the vst serviced and cleaned the fuel presure on the rail is 38. When I first boughtit the motor ran rough around 2k rpm and would bog itself to quitting once in awhile. It runs like a champ. spark advance sets idle rpms. Apr 29, 2012 · Re: Mercury 150 Blackmax running rough When there is a difference in smoothness between loaded and unloaded running, often the problem will be found in the small passages of the carbs, either idle fuel or idle air/emulsion tubes are still restricted and sometimes can be a real bear to get cleaned without actually running a very fine wire thru every passage, followed by a good solvent then Jul 30, 2013 · My mercury 150 optimax is rough at idle, but once it has been out a run the idle is ok. how can I check spark without doing any damage? RPM at WOT is 4200, manual says it should be 5500 -6000 Apr 29, 2008 · Re: 9. It’s highly recommended to follow the idle mixture adjustment procedures in the factory repair manual. Fouled, or improperly gapped Spark Plugs: Causes misfiring at low RPM, where the Ignition strength is at its weakest = Rough Idle. the motor starts easily but idles rough and continues to idle rough. Your Mercury outboard engine is a powerful marvel designed to conquer the water with precision and speed. 2. After 5 min of sailing it doesn't idle anymore. Still consider myself a "Marine Apprentice" after 47 years (learn something new every day). They can answer questions for any Mercury outboard motor model or horsepower including Chrysler Outboards, Force Outboards, Mariner Outboards, and Mercury Inboard/Sterndrives. Recently replaced throttle position sensor (the warning light indicated TPS problem) that warning has gone but idle problem still exists. I had fogged the engine for the winter, and had started it on the muffs to burn out the fogging oil, and also used Power Tune to "blow out the cooties" Oct 4, 2014 · Timing set to 6 btdc idle and 20 atdc Oil pump delete kit installed Switched to pre mix use only mercury 2 cycle oil Thermostats Checked magnets on flywheel all seem in place and good Compression is cyl #1 122psi, cyl 2 118psi, cyl 3 120psi, cyl 4 119psi, cyl 5 120psi, cyl 6 120psi Spark tested good on all cyl at idle on muffs Please HELP Jun 2, 2016 · Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC. I've been told rough idle is the nature of the beast and is common for all Mercury 2-strokes as they are optimized for riding. Higher RPM it seems to run well, mild hesitation coming up on plane. I have brought it in, and the person said the float sticks some times. WOT RPM'S are set correctly and I am running about 5200-5400 RPM's when full throttle, depending on weight. Oct 2, 2010 · 1988 Mercury 90hp 3 cyl 2 stroke s/n 0b312461 We took out our boat for the first time in several months for the first trip after winter. Compression is good 114 highest cylinder 110 lowest. (should have said that sorry) its been into the mechanic but they couldnt get it to run rough in the test tank so hard to fault find unless on the water i guess (still charged $$$$$ so cant afford to continually put it in the shop). Mercury Mariner Outboard Forum . I therefore am trying to adjust the idle mixture screws to a proper setting. Nov 10, 2004 · Ask the experts on our Mercury Outboard Parts Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. It starts fine and runs fine at any rpm above idle. Serial number - 0G405715 - I purchased this boat last year, always idled pretty rough. Jun 9, 2013 · This is an update for an old problem i have never managed to solve. 9 Mercury won't stay running at idle It most likely is the carb, The little brass tube that runs in front of the trottle plate if clogged or if it has a small hole(pin size) will make it not idle. May 27, 2012 · My 90 ELPTO is quite rough at idle, even stalling occasionally. A rough idle on an outboard is generally caused by a failed spark plug, a clogged or stuck open fuel injector, a clogged or dirty carburetor, or an engine that has an issue with the timing when dealing with a 2-stroke outboard. Feb 12, 2007 · Re: Rough running 20 hp Mercury Problem solved. the compresion is 140 psi there ais no Jul 18, 2009 · My 1986 25HP Mercury all of a sudden will not idle and run at low throttle. Also, move the throttle up a little past idle when starting the motor warm (this gives it a little extra air when starting warm and reduces the chance of flooding) then bring it down to idle after the motor starts. Change the spark plugs. 5 open then get on the water and punch out a hole shot. P. My service manual instructs me to initially set these screws at the following setting. Problem has started about 5 years ago below you will find all things we have tried to solve the problem but till today with no success. 5 foot aluminum jon and a 4 blade 13 pitch prop. I’ve already discussed the problems when water is present in the fuel; however, issues with the fuel injection can cause similar problems. Carb initial adjustment, per manual is 1. Take the brass plugs out of carbs and clean the jets. problem is intermittent. I have had it to one repair shop who cleaned the carbs, ran sea-foam through it, cleaned the gas tank dry and refilled it with marine grade gas, it was worse when they gave it back and Jun 15, 2010 · Ask the experts on our Mercury Outboard Parts Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. The Jun 30, 2005 · Re: 2002 50 HP Mercury rough idle It is a 2 stroke. It runs really good at higher speeds but not at idle. fast enough to stay running, slow enough to prevent gear clunking. I have already rebuild the carb. An old school merc mechanic that knows 100 times more than me explained this to me just last week. However, like any mechanical device, it is not immune to issues. Runs perfect when it's cold and not when warm! May 30, 2021 · Our new 2021 Mercury was having idle issues such as high rpm at idle and irregular idle speed. I rebuilt the carb, replaced the fuel line and tuned the idle. It's the one on the right hand side of the carb with the spring on it. 8 HP) dies when shifting or idling down. I bought the rebuild kit. I was able to bring the idle down to about 800 - 900 and adjust the air/fuel mixture as such and the rough idle stopped. Motor will not allow me to go above idle. There is no reduction in perfomance or fuel economy. We are going to replace the gaskets, clean out the carbs, drain the fuel filter and replace it, and also put in an inline water seperater. The 4-stroke outboard engines, in particular, provide boaters with dependable power, smooth operation, and excellent fuel efficiency. Yet, when I get it back it did it again. May 15, 2010 · Greetings, I have a 96 Merucy 90HP 2 stroke (90ELPTO). For outboard repair i Hello all I have a 150 EFI 1999 model that runs rough at idle, I have checked compression and they are all at 120 psi I have also installed new plugs, Also I was wondering what the mix of oil is because it is on a 19 Silver King and no room for the Oil reservoir, so that is the way it was Jul 2, 2015 · But it idles rough and will stall when put in gear and I can't get the engine to idle at the recommended rpm(650). I'll just have to set it to the default setting and adjust it when I go out on the water this weekend. I can take it to 45mph and runs smoothly. The boat hesitates, loses RPMs then it recovers within seconds. It will crank again fine with Full Choke & idle again fine. The screw is the only adjustment available on this carb. Alarm will also go off at times when I Jul 23, 2022 · However, some users have mentioned their disappointments because of the mentioned troubleshooting issues with the mercury 4 stroke outboard motors. but it runs perfect after that. Also make sure those plugs are tight and gaskets are good. 5 litre Carbs not EFI has a rough idle. Fuel-related Issues. In this video I'll go over some of the fuel Mar 17, 2009 · Re: 2000 mercury 150 rough idle You probably need to do some basic troubleshooting and provide more information to get helpful responses. Motor May Run Rough, Sputter, Or Stall: According to a group of Mercury Pro XS outboard motor users, sometimes the motor gives a hard time by constantly sputtering or stalling on idle. It won't idle below 1000rpm. Jul 26, 2004 · Re: Mercury 110 (9. At times is hard to get it started cold and warm. I thought it was the cable, but when I shut the motor off, it shifted back and forth fine. If your outboard engine stalls while idle, it might have something to do with an issue with the fuel. When I could get it through to the power band it ran smooth. I have a second identical motor that runs perfectly and have swapped parts from this motor to the problem motor to affect a repair. It idles roughly and misses at all speeds. The carbs were loaded with water and the fuel filter was half full of water. Some times the alarm goes off 1 long beep. Top carb 1/2 turn out, bottom carb 1-1/4 turn out and bottom carb also 1-1/4 May 28, 2013 · I just bought a boat with a 1985 Mercury 75 hp outboard and need to know the proper way to adjust the idle for the best performance. Some Jul 3, 2008 · The bump up in idle makes it difficult to shift gears again until it drops back down to normal idle (after 2 or 3 seconds). The obvious suspects are the carbs so taken them off the engine and cleaned and checked the thoroughly. When I Jun 2, 2023 · Mercury outboard engines are renowned for their reliability, durability, and performance. In this blog post, we will explore some common problems with the Mercury Optimax 115 and provide solutions to help you troubleshoot and maintain … Mercury Optimax 115 Problems: Common Issues Apr 10, 2017 · I have to check the thermostat! When it's cold it starts perfectly and idles perfectly. Sometimes it will do this when I start it and as it warms up at idle it will stall. Here are a few fuel-related problems and their solution: Apr 27, 2009 · Re: Merc 115 EFI 4 Stroke running rough Might be time to change air and fuel filters. When I pulled the throttle back, it would not go into neutral. Jan 27, 2011 · Re: Mercury 115 2+2 How smooth should this idle? Many owners of the 115 2+2 do not relize the motor only idles on the top two cyls. Apr 30, 2007 · Re: 25hp 4 stroke mercury idles great loss of power/rough Hello, I seem to have the same problem. When I took the carb off I noticed that the fuel line going into the carb had a crack through it. Fuel Pressure-110 lbs Air Pressure-90 lbs Has great spark and compression is 125 lbs on all 3 cylinders Spark Plugs look wet Any ideas??? Mark May 2, 2010 · I have a 2002 25HP Mercury 2 stroke tiller outboard, electric start, model 25ELH. Sep 12, 2007 · Re: 2001 Mercury 150XL rough idle, hard start hot Don't use the enricher at all when the motor is warm. I bought it used, and it has performed this way since I've owned it. Special thanks to the Facebook Group Inline Enthusiasts!!!! Matt, Daryl, and Tristan!!! Outboard was running extremely b Here is a seldom talked about solution to an outboard engine that is hard to start and idles poorly. Idles at 750rpm but sometimes tach will start jumping around showing up to 2000rpm at idle and almost 7000 at wot but doesn't do this everytime time when idle is rough so I'm thinking it's not related. Aug 9, 2020 · Diagnosing a rough running four stroke May 18, 2010 · Hello all and thank you in advance for your time. Ran a whole can of Merc Engine Tuner through the carbs. Jun 6, 2020 · Hey all! I have a 2008 Merc 50 hp 3 cylinder 2 stroke. In any of those cases, reliability is far better than it was in decades past, fuel efficiency has increased, and problems like smoky exhaust and ear-splitting sound levels are ancient histo Jul 10, 2015 · s/n 0T481102 I have the Mercury service manual but need help. Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor A powerful alternator – 60 amps on the 150hp outboard and 35 amps on 75 to 115hp outboards – helps keep batteries charged and your onboard electronics running all day. To diagnose and fix the issue, it’s essential to identify the root cause and take the proper steps to solve the problem. My manual says to check and replace (if necessary) low pressure fuel filter every 100 hours or yearly, and to check and replace high pressure in-line fuel filter every 300 hours. Idle mixture is critical, start at 1 and 1/2 turns out from lightly seated, start and warm up the motor securely tied to the dock. Will cause rough running, especially at idle. It still ran rough and stopped at idle. Jun 10, 2023 · The Mercury Optimax 115 is a popular outboard motor that is known for its reliability, fuel efficiency, and outstanding performance. I have been. When I try to advance the throttle, the motor does not have any power and it will stall if I try to go about 3000 RPM. This comprehensive blog post Sep 27, 2009 · Re: Mercury 25XD Missing and Rough idle I think it's a common thing, the motor used to jump left and right and shake the boat because it was idling so hard but the plugs and new wires helped alot. For an outboard that stalls while on idle, go through the following checklist to troubleshoot the problem: Check the Carburetor. This essential fluid plays a pivotal role in maintaining your outboard engine’s health and efficiency. Interestingly enough, when the engine came up to full temperature again it started to stumble at idle. maybe i have to readjust the low speed mixture screw. Rebuilt the carbs with new gaskets, needles, and floats. One of the most common problems with outboard engines, including the Mercury 40 HP 2-stroke, is fuel-related issues. Also had Aug 8, 2017 · ok so i have a 2006 175hp mercury optimax boat was running great killed the motor, then ran my 9. Apr 6, 2024 · In this video we walk through 2 ways to fix idling issues in an outboard. It will even hesitate and stutter a bit just before the other two chime in at 2000 rpm. Aug 28, 2016 · But on next start it may idle fine or it may be rough again doesn't matter if motor is warm or cold. It runs smooth at top speed but will run rough as soon I slow down. I had Jun 23, 2022 · In this video I tune an outboard to stop it stalling and idle. Fuel system issues can cause causing a rough running outboard. Jul 26, 2011 · First time out with boat (1999 model) and it ran great for first 15 mins. They were actually clean as a whistle and no wear marks. zbgz qsbn pxbg fody kfbeykq nahqhx jnzs zuyfiad anvk mxpx