Now the problem has advanced to a full time problem. Engine is 1986 model mercruiser MIE 340 big block with quadrajet carb. The boat would hesitate as it accelerated under load. Running high octane in an engine not designed for it is a waste of money. If I stay on it it'll backfire. She planed off as normal and we're on our way. Let's take a look at seven reasons why your outboard won't throttle up and how to fix them: Tangled Propeller Poor Gas Quality Clogged Fuel Filter Fuel Hose Replacement Faulty Impeller Bad Spark Plugs Malfunctioning Fuel Pump 1. 3. Im have changed spark plugs and cleaned carburetor. Had a coil short while underway and accelerating. Next, if at all possible, try to run the engine off of portable Merc tank. Mercruiser 5.0 bogging down under load. Bogging down during acceleration under load is a classic symptom of a lean condition in the carbs. thinkpad lenovo laptop. Jun 3, 2018 #1 Hi all my first post but i have been following the forums for years. Mercury MerCruiser Sterndrives & Engines . I'm completely lost. 2. Mercury 50 1987 bogs down when full @ full throttle 13 posts Sep 12, 2013 Motor Runs great bogs down under load. After a few minutes it would settle down and run at full power. Bondo Moderator Staff member Joined Apr 17, 2002 Messages 69,013 Jul 1, 2012 #2 OutOfControl newportri 82 1 Here is a possible reason for outboard motor bogging down. Mar 5, 2010. Engine timing out. If you hear a sucking sound you have a restricted tank vent. Item: 134213185511: Seller: themobilityshop ( 4828 ) 99.9% Location: March, GB Accept Payments With , Shipping: See shipping cost, Ships to United Kingdom: Guarantee. This will verify if you have a fuel pickup issue in your tank. Would not restart. on startup runs fine at first. Tangled Propeller If your outboard motor will not throttle up, the issue may be as simple as a tangle. Re: 3.7l bogs down after running under load for 30 minutes Only run the octane fuel your manual tells you to. So I changed out the fuel filter, didn't work. If I shut the motor off for a couple - Answered by a verified Marine Mechanic . C captquint Recruit Joined Aug 20, 2011 Messages Or a dirty carb. 16 posts Jun 23, 2011 1984 Johnson 70 idles but won't go 30 posts Jun 1, 2011 Johnson 70 hp no power under load Update 27 posts Oct 30, 2006 More results from www.marineengine.com motor bogs down at full throttle Page: 1 - iboats . Confusing problem. Would run fine off the hose in the back yard but under load would crumble. I've tried adjusting timing, hasn't changed anything. Tested the coil (lifted the negative. There is a relation between the propeller size and the rpm of the engine of the boat. The the engine sit for 30 minutes and then do the same process again -- run for 5, sit for 30. Underload I have a 1988 3.0L mercruiser with a bogging issue. And it seemed to be running really lean. The coil was the original (17. years old). 4,730 satisfied customers. He wants to do a leak down test, but I'm not sure he's on the right track since the engine SOUNDS fine at low speeds and even under heavy load, it just can't deliver enough power. At medium throttle or if I would goose the throttle it would stumble. With that in mind, If you have a propeller that's too big or has a high pitch, then you may be falling below 3000 RPM. Every additional inch of blade pitch reduces RPM by about 150-200. Another probable reason your boat doesn't go over 3000 rpm under load is that it has the wrong propeller. Changed O2 sensor didn't work. The engine is perfect but when i try to accelerate onto plane the boat will not get up and the engine will not rev past 3 . Although it certainly could be other things, I'd look into the possibility that it might be time to rebuild the carbs. No misses or shuttering, it just gets to 4000 rpm and that's all she wrote still have a good quarter throttle left but it doesn't effect anything when floored. Starts idles bogs down n dies under load, in water.with baffle runs fine. Also check your. Every additional inch of blade pitch reduces RPM by about 150-200. I accidentally mixed gas 40/1 not 50/1 but - Answered by a verified Marine Mechanic . Under load will not run past 2000rpm, then stalls out. monthly price of lumber in the united states; uncle remus fried chicken recipe cannabist tempe cannabist tempe Then it will run well for a time til the vacuum is too great for the pump to overcome. Defective power pack or connections.. LDMERC New Member. Mercruiser 5.7L stalls on acceleration. However, if I throttle down, it'll rev down and idle fine. With the engine already warm, start the boat running on the new fuel, and run the engine up to 2000 RPMs and let it run like that for about 5 minutes. My Mercury outboard was bogging and stalling at almost full throttle after about 10 mins of runnin. Then you can do a few inexpensive maintenance items such as changing all filters including the engine filter under the cowling, new plugs, check hoses and connections. Strike 3! Partially open the gas cap when the problem occurs. Had a similar thing happen and it ended up being a hole in the water jacket. Or all 3. ! Mercruiser D4.2L 220 - Engine starting and running well, excessive spits of what appears to unburnt diesel coming through exhaust onto water surface. It just bogs down after about 1/2 throttle. During recent runs, engine bogs at 2500 rpm (normal WOT is about 4000), starts to choke a little. Boat was running 50+ at 5000-5200 rpm now she'll only go about 33. Here's how RPM changes with propeller specs: Every additional inch in propeller diameter reduces RPM by about 500. 2. 42 years experience . Chan read more. Here's how RPM changes with propeller specs: Every additional inch in propeller diameter reduces RPM by about 500. Apparently happens a fair bit at the cylinder closest to the water. I first had backfiring at 1/3 throttle, replaced the points with electronic module , changed coil, changed gas lines, added a fuel/water separator, put new fuel filters in carb and fuel pump. The right propeller size should be used in a boat. Ended up replacing the engine for a newer 1. wires and showed short on both posts). I have a 2008 4 stroke Mercury 60 bigfoot on pontoon boat. Also the engine has been running fine up until two weeks before the July 1 launch. I need some help from you all about a problem ive got, Ive got a 2002 Maxum 2700SCR with a Merc 350MAG mpi, we recently had a service by Southern Marine Services and they also replaced the manifolds, risers & riser blocks. So if you ever have intermittently fluctuations on your Mercruiser engine you should check all your engine electrical connectors and ground. Boat runs like a top all the way up to 4000 rpm. cz 457 mtr threaded barrel; best cold air intake for e36 m3 If it's the wrong propeller size, the engine's rpm will be affected. cr500 craigslist ad. 1160 hours on engine. It started doing this late last summer and I looked at it for a couple weekends and then gave up. I have a 5.7 L Indmar Assault engine that bogs down under load (pulling a tuber). stuckey73 New Member. Even no so quickly. Joined Aug 16, 2006 Messages 5. My guess is it's getting too much gas, because if you try to throttle it up to wide open, it starts . with no problems. The motor starts up the following morning to head back home with no sign of concern. Was a small leak in the top of the cylinder. Wrong Propeller. It a 4 cylinder mercruiser in a Thompson boat. Marine: Boating, Sailing, PWC, Nautical Navigational GPS - Mercruiser 3.0LX 1994 hesitates when quick accelerated - My 3.0LX hesitates and sometimes stalls when quickly accelerated. I slowed down and the re-accelerated all seemed fine. The tach shows 3000rpm and if you advance the throtle nothing happens. There are a few signs that your engine isn't working as it should: Overheating. I can push water all day as long as I don't go over 3,000 rpms. "/> This should be the first thing to check if you're having RPM troubles. A lot of times it turns out to be something simple and inexpensive. Re: 5.7l mercruiser engine bogging down.. I had the same problem until the other day. If neither of those tests show where the issue is, then pop off the cowling and pump up the fuel ball. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician. Ignition not starting properly or bogging. Changed the fuel pressure regulator didn't work. When I attempt to go full throttle, it will run fine for a few seconds and then start bogging down and/or lose power. Can it be related with the bow's high lifting and the carb's float Then take the boat out for a good run afterwards. Buy Low pressure electric fuel pump for Mercury Mercruiser 4.3, 5.0, 5.7 carburated engines, replaces 861155a3: . I have a 94 Mercruiser 4.3 LX with weber 4bbl carb. Thread starter the docta; Start date Jun 3, 2018; T. the docta Recruit. jimh: posted 12-07-2007 08:18 PM ET (US) Most major auto parts stores carry compression test kits for $30 to $50. Any ideas? As I move the throtle to full power, the best I can get out of it is 3000rpms. About 45 minutes into the cruise home running between 3000-3150 the motor seemed to stumble. Jeff G. Marine Mechanic. Burnt out spark plugs and coils. It's hard to believe a cylinder problem would manifest suddenly. As I'm load testing this pump sparks were arking across the bench! I wait 15 min's or so and the engine will start back up and run fine before the same thing happens again. Hit 3000 rpms under load and it just bogs down like its not getting fuel. BUT, you also have water in the carburetor float chamber. Engine Malfunction. Motor is a late carb 5.0 merc . A series of troubleshooting tests chasing the reason for the engine bogging down hesitating while trying to achieve full throttleAmazon affiliate links-Aweso. So I removed the pump again and bench teted it with a power probe kit. 40 yrs. Underload the boat will run perfect for 20 min's or so at then start to bog out slowly, before hesisatiting and finally dying. High octane is designed for alternate compression engines and your engines timing and controls may not be set for it. my current set up is a 21ft british built offshore boat similar to a scarab 22 or small baja. Starts immediately, then under load stalls after surging. Was towed in.
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