Mercury outboard stalls at idle

These increase the air intake causing a lean fuel mixture and vacuum pressure problems. A downloadable version of the factory manual is available from this site.

How do you adjust the idle on a 40 hp Mercury outboard.

Mercury outboard stalls at idle. Mercury outboard idles rough andor stalls refers to when a Mercury outboard runs in an irregular or uneven manner while in neutral or out of gear. FIXED my rough Idle stall problem 900 -2000 RPM running hot 60HP EFI Mercury Outboard 2005 Four stroke engine. The engine starts fine and after runing for.

Mercury outboard dies at idle. Ive scratched out the fuel pump just because at WOT thats when the fuel pumps use the most fuel. I dont have any problem at high speed.

Ill check the fuel lines for any leaks. Ill also replace the fuel line connectors. I have a new pair I can use.

Im going out early tomorrow morning to test again. Mercury 90-HP FOURSTROKE Stalls at Idle. Posted 07-20-2011 0233 PM ET US I have a 2002 Dauntless 16 with a Mercury 90-HP FOURSTROKE.

When I shift from Forward to Neutral or when at idle the Mercury 90-HP FOURSTOKE outboard engine dies. It makes it very hard to dock especially when the wind is blowing. Outboard stalls when advancing throttle past idle speed My 40HP Merc does the same thing and I think I got it figured out.

Looks like its the switch box not allowing any spark to 2 of the 4 cylinders. Try checking spark at all of your cylinders. Its an easy test and may help you narrow it down between a fuel or electrical problem.

Outboard Stalls When Idling. For an outboard that stalls while on idle go through the following checklist to troubleshoot the problem. If your outboard stalls whenever you drop it into idle the problem usually lies with the carburetor.

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. Some mercury 115 pro xs users have claimed that sometimes the engine starts operating erratically all of a sudden. Because outboard engines tend to sit over the winter time holes in the intake manifold gasket can occur.

These increase the air intake causing a lean fuel mixture and vacuum pressure problems. The result is poor acceleration rough idle and stalling. A manifold leak is easily detected by a hissing sound coming from the source of the leak.

When an outboard motor runs at speed but cannot hold an idle it usually indicates a problem with the carburetor. Outboard motor designs vary depending on make and model but all operate on similar principles. Consult your owners manual to check items that may be unique to your motor.

These idle mixture adjustment tuning procedures apply the Mercury outboards manufactured between 1965 thru 1989specifically 45-HP to 115-HP models. Its highly recommended to follow the idle mixture adjustment procedures in the factory repair manual. A downloadable version of the factory manual is available from this site.

Mercury responded to my inquiry. They said the symptom of stalling when decelerating is most likely due to an incorrect setting of the idle air control valve. They said this setting is done electronically using their software and has to be done by an authorized service center.

Do you have any comments on this. Merc 99 4-stroke will idle but dies when given throttle - Answered by a verified Marine Mechanic We use cookies to give you the best possible experience on our website. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them.

Merc replaced the LU at no charge under warranty. But she is not the same. I cant get it below 25 now and my shifting sucks.

I took her back and the tech set to factory specs and it still idles high and the shifting clunks in and out of gear. I am very POd. Hi Knowledgeable Ones.

My Mercury 5 hp outboard is acting up. Starts fine and when put in gear will proceed on slow. But when I power up the motor sags and cuts out unless I power back down.

It will run fine a little above idle. And when I put it in neutral I can throttle up full power without any hesitation. A bit of backstory.

Mercury outboards 90 hp 1997 ser 6515897 Not rated yet feel like I need to adjust the idle up. When in natural its fine but when to go to put it in gear forward or reverse it wants to stall unless you throttle. How do you adjust the idle on a 40 hp Mercury outboard.

Start your Mercury 40 horsepower motor and allow it to idle. Insert a screwdriver into the Mercurys idle adjustment screw located at the bottom of the carburetor and turn it to the left until the motor barely continues to run. What RPM should an outboard idle at.

Outboard idle rpm Best at 900 idle 750 idle in gear. 1965-1989 Mercury Outboard Idle Mixture Adjustment. November 3 2016 Repair Manual 0.

These idle mixture adjustment tuning procedures apply the Mercury outboards manufactured between 1965 thru 1989specifically 45-HP to 115-HP models. Its highly recommended to follow the idle mixture adjustment procedures in the factory repair manual. Similarly one may ask how do you adjust the idle mixture on a Mercury outboard motor.

Adjust the idle stop screw on the side of the carburetor near the choke cable turning the screw with a screwdriver until the vacuum gauge is reading about 600 rpm. Turn the idle mixture screw counterclockwise 14-turn at a time until you hear the engine begin to stall out and turn it clockwise. Outboard Idles Roughly Or Stalls.

According to Mercury 25 HP 4 stroke many users sometimes the motor idles rough or stalls. Users claimed that the outboard motor runs irregularly or unevenly while they put it neutral or out of gear. However various reasons may cause this particular commotion but first you need to do the proper investigation.

I have a 2006 5hp mercury outboard and it runs great at high speed but dies at idle. If I increase the idle speed it races and slowsraces and slows. A neighbor tried to fix it but couldnt.

Cleaned plugfresh gasfuel additivesoaked carb for. Mercury outboard idles rough andor stalls refers to when a Mercury outboard runs in an irregular or uneven manner while in neutral or out of gear. Jul 03 2008 3.

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