Surging outboard at high rpms

SinceCorrectCraftFan. This site is not affiliated with Correct Craft, Inc. Funding for the site comes from members like you. Click on the link below to make a donation. New Posts. Members Profile. Post Reply. High all, I have searched the forum and haven't really found an answer. I've got a SN with a W, electronic ignition, Holley 4 barrel. If I add additional throttle, it surges between RPM. It will continue this indefinitely.

If I try to rev higher it bogs and sputters worse. If I back off, it runs smooth. At full throttle it sputters and won't get on plane. If I drive around for a while, the sputtering starts at lower and lower RPMs until finally it won't even run when you go from neutral to forward.

I have now replaced the fuel pump and it still surges when running in the yard. I don't see any point in dragging it back to the lake now since it won't get above RPM on the hose. I rebuilt the carb last year, not sure if I did something that would cause this problem Any troubleshooting tips? I am convinced it is a fuel issue, since it runs perfectly smooth up to RPM.

I am thinking an ignition issue would show up sooner. Maybe it is sucking air and leaning out at high RPM??? I'll try spraying ether around the carb next and see if that smooths out the surges. Thanks in advance for any help!

surging outboard at high rpms

What kind of EI do you have? Do you have the original dizzy you could try? May be the cause. Same distributor, just replaced the points with the electronic components.

Decided to upload a video to see if anyone can help Video Link Bought plugs and wires, but pulled first 4 plugs and they looked perfect. Haven't pulled the other 4. Ideas welcome! Thanks, Keith.Whatever the cause, if your car's engine is misfiring or surging, it will prompt error codes to appear in your OBD-II Diagnostics system.

These codes can cause you to fail your local vehicle inspection, or at the very least can result in that alarming orange glow to appear on your dashboard: the Check Engine Light. The good news is that, in many cases, an engine that is running poorly can be repaired for very little money. Performing maintenance tasks like replacing worn spark plugs, inspecting plug wires, or even replacing an old, partially clogged fuel filter can make a huge difference in how well your engine is running.

This can also save you a bundle of money, because even an hour of diagnostic time at your local repair shop can put the smackdown on your wallet. But if you've kept up with your maintenance and your engine is still acting up, read on for possible causes and fixes. First, let's pinpoint exactly what's going on.

The list of symptoms and possible causes below should help you get a better idea of what's causing your engine to act up. If you see a symptom that looks familiar, read on to find out what a possible fix can be. Look over all of the symptoms and fixes to be sure you're working with the one that most closely describes your situation.

Matthew Wright.

surging outboard at high rpms

Matthew Wright has been a freelance writer and editor for over 10 years and an automotive repair professional for three decades specializing in European vintage vehicles. Updated December 03, The fix: Check the choke plate and make sure it is opening completely. The engine may be running too hot. The fix: Check and repair the cooling system. The fuel pressure regulator may be operating at low pressure. The fix: Check fuel pressure with a fuel pressure gauge.

If low, take it to a mechanic, as repairing or replacing a fuel pressure regular is generally not a DIY job. The ignition timing may be set wrong. The fix: Adjust ignition timing. Otherwise, have the coil packs looked at. There may be a fault in the computerized engine control system. Check engine control systems with a scan tool. The fuel filter may be partially clogged. This is an easy fix! The fix: Replace the fuel filter. Torque converter automatic transmission only may not be locking at the right time, or it may be slipping.

The fix: Check lock up circuit or have the torque converter replaced. This is not a DIY job. There may be a vacuum leak. The fix: Check and replace vacuum lines as required. Possible internal engine problems.

The fix: Check compression to determine engine condition.If your outboard engine is sputtering at any speed, idle or full throttle, it could be the result of several common malfunctions. You may need to make a few timing adjustments or replace a spark plug, or you may need serious mechanical inquiry. If your marine engine is sputtering, use a timing light to check each spark plug wire individually, while the engine is operating, for the proper voltage output and ignition spark your individual model's manual will have these readings.

This could indicate which plugs and corresponding fuel cylinders are giving you problems. Remember which plugs are giving you the worst voltage readings.

Remove your boat from the water and place it on a trailer. Remove all your spark plugs with a ratchet and appropriately sized socket. Clean any residue from each plug contact and plug port. If you notice any erosion, replace the plug. Use a plug gap tool to set the correct measurement on your plug gaps, according to your manufacturer.

Test out your boat's operation at full throttle again. If you notice an excessive amount of wet and black carbon on your plugs, you may have a bad fuel-water mix. There also could be a leaky head gasket. See a technician. This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.

To submit your questions or ideas, or to simply learn more about It Still Runs, contact us. Fuel Type If you notice an excessive amount of wet and black carbon on your plugs, you may have a bad fuel-water mix. About the Author This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.The Forum is a free service, and much like the "free" content on Public Radio, we hope you will support WoodenBoat by subscribing to this fabulous magazine.

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surging outboard at high rpms

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Remember Me? Advanced Search. Forum Misc. Results 1 to 17 of Thread Tools Show Printable Version. I've had the motor for about a year and it's mostly used for maneuvering around launching ramps and mooring fields, plus it gets laid down on its side for long periods the correct side at least.

As for basic maintenance, I've checked all I can think of. Fuel is fine, carburetor cleaned wasn't clogged to begin withoil changed although it does appear some oil was getting in the chamber, maybe when it was laid on its wrong side one time.

Adjusting the idle set screw doesn't help, it's set about 'right' by ear from when I got it. Also, throttle linkage is fine. This is my first outboard and I have a lot of experience working on automobile engines, but none with a carburetor, so I may be missing something obvious.

I have had a real hard time finding a factory service manual as well. Thanks for reading. Some marinas sell the older-style gasoline without the problematic alcohol - usually at inflated prices but it may be worth it for testing. I have flushed the fuel, but it is very possible that the fuel I refilled it with being 87 octane sitting around water for a couple weeks has gone to hell. Is another way around this buying higher octane fuel to compensate for the 'octane drop' that comes with the water absorption?

I usually buy my fuel at a gas station, rather than a marina. It is a relatively new engine. What Thorne says is correct--try fresh fuel. Also, I advise running feul stabilizer in the fuel all the time, not just for winterization, due to the E fuel we have now.

Is there a small inline filter on board the engine? It will look like a little white or opaque canister in the line upstream of the carb.

If so, swap that out, fill with fresh fuel and try again. Alsom check the sparkplug's electrode for proper gap etc. Hell, just get a new plug, fresh fuel, change the filter if there is one.

Them try it.I use my motor to troll with and have been experiencing a surging problem in low rpms. The motor starts perfectly, idles perfectly, runs WOT at rpm. Ive got new plugs indexednew fuel filter, fresh gas, the gas priming ball stays hard, no kinks in my gas line.

I will simple be trolling along sometimes 10 minutes into the trip sometimes and hour into the trip and the motor will get a surge in rpms, sputter a couple tiimes and then go back to normal. Unfortunately that is not much to go on so it would have to be first determined if it was an ignition glitch or a fuel problem. Monitor the fuel pressure at all speeds and when the engine "acts up" to see if there are any changes.

Why Does My Outboard Sputter at Full Throttle?

Use a clip-on timing light to show if the ignition flickers or cuts out when the motor starts to run rough. The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.

The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.

If nothing is obvious, then you may need the services of a trained dealer technician to use the diagnostic software to monitor all the systems while duplicating the running abnormality. Turn on suggestions. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.

Showing results for. Search instead for. Do you mean. Etec surging in low range rpm's. Hello E-Nation! Report Inappropriate Content. Message 1 of 3 1, Views. Reply 0 Kudos. Re: Etec surging in low range rpm's. Message 2 of 3 1, Views. Message 3 of 3 1, Views.Remember Me? What's New? Results 1 to 17 of Thread: Outboard surges at full throttle. Thread Tools Show Printable Version. Join Date Nov Location columbia Posts Outboard surges at full throttle Just got my motor rebuilt by Tom Hughes marine.

I put it in the water and at seems great other than a slight surge at full throttle. It will rev up and down and up and down.

Troubleshooting Engine Driveability Problems: Surging or Misfiring

Not a huge surge, but noticable. Anybody know what this could be? Take it back to Tom. He will make it right. I'll do it after the season is over. Originally Posted by cudexter I would argue that JP has the highest "quality" to "trash talk" post ratio on this site.

Quote: Originally Posted by Air Raid Wait till 3 years from now! Join Date Sep Location lexington sc Posts 2, Have you checked to see if the water intake is clogged? Happened to me last duck season. Motor was surging when I would get it going good.

I'm working on moving the hose to the side of the boat so I can always see if water is coming out. Join Date Dec Location boiling springs south Posts Join Date Jul Posts 3, Join Date Jul Location columbia Posts 3, Check your hose from the gas tank, the primer bulb and all the fittings.Remember Me?

What's New? Results 1 to 17 of Thread: Outboard surges at full throttle. Thread Tools Show Printable Version. Join Date Nov Location columbia Posts Outboard surges at full throttle Just got my motor rebuilt by Tom Hughes marine. I put it in the water and at seems great other than a slight surge at full throttle. It will rev up and down and up and down. Not a huge surge, but noticable. Anybody know what this could be?

Take it back to Tom. He will make it right. I'll do it after the season is over. Originally Posted by cudexter I would argue that JP has the highest "quality" to "trash talk" post ratio on this site. Quote: Originally Posted by Air Raid Wait till 3 years from now! Join Date Sep Location lexington sc Posts 2, Have you checked to see if the water intake is clogged?

Etec 150 surging,losing and gaining rpm's

Happened to me last duck season. Motor was surging when I would get it going good. I'm working on moving the hose to the side of the boat so I can always see if water is coming out. Join Date Dec Location boiling springs south Posts Join Date Jul Posts 3, Join Date Jul Location columbia Posts 3, Check your hose from the gas tank, the primer bulb and all the fittings.


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