Question about Light Outboard Motor Boat Bass Fishing Saltwater Base

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8hp johnson, 1999,plugs good, wires good,have put in new gasoline 50.1 mix, runs great at higher rpms. When cold start, it will idle at slow rpm. Once warmed up or a hot day, it will not idle when the throttle is at idle. It idles for a bit and then stumbles and stops. It will restart ok and run, but I have it on a small boat and need to run more at idle than fast. my guess is power pack , but How do I determine before I go buy it.

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Have u tried to adjust you timming linkage? its on the side of the motor where the shifter linkage is try to turn the bolt in or out while running you may get it to idle better if the power pack was bad the engine would cut out at all speeds

Posted on Jun 27, 2009

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1986 Mercury grand Marquis cutting out when slowing down nearly impossible to start. Oil changed, new air filter, new plugs and wires, new fuel filter...?


I had an experience with a 1984 T-Bird with a 302. The 1986 may have the same system. With that car there was a temperature sensor that affected the idle speed once the car was close to warming up.
With even later models there is a "cold start sequence" which is an electronic way of replacing the ancient choke. The "cold" feature set the fuel mix and the RPM and made starts easier. Now you did not say if the starting problem was when hot or cold or both.

The poor performance when slowing down can be related to the idle rpm being set too low once the thermal switch cuts out. What happens is someone tunes the engine for a rpm that may be correct for the car, but the thermal switch has not dropped the rpm yet. Then when the car really heats up, the idle drops even lower and when you take off your foot from the throttle, the throttle closes too much and the engine cuts out when you are slowing.

Put in a new thermostat. The idle settings can not be set until the thermal switches activate to a run position. Also you may have some vacuum lines crossed which are making the cold and hot cycles reverse. There should be a label with vacuum line routing shown stuck on a part that holds the radiator.

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3 Answers

Dying, not starting after it's been warmed up. Runs beautiful on cold engine. Replaced plugs, wire, cap, rotor and crank position sensor, no luck.


Your car cold start valve puts more gas into the system keeping your engine running higher RPM. When you car warms up, the cold start valve will stop working and your car RPM will drop. What you could have is a vacuum hose disconnected which puts more air into your engine - therefore when you press on the gas pedal, your engine would shut off or you find lack of power and then shut off.

Mar 27, 2015 | Cars & Trucks

1 Answer

Johnson 115 V4 no push at low revs and no oil alarm at hi revs


Good Morning George,
First Thing To Do Is Use Pre Mixed Fuel Until This Problem Is Solved Or Engine Damage Could Be The Result.
Pre Mix Fuel -Oil Ratio Is 50:1
Have You Tried Priming The Oil With The Primer On The Oil Tank Supply Line?
Is The Oil Tank In The Boat Low On Oil?
Let Me Know If You Have Any Luck!
Cheers
Gordon

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1 Answer

Driving on the road the RPM goes higher wituout speedind


Check out related help links to troubleshoot these problem:----Click the link below:---Idles Fine but RPM jumps in drive mode?http://technoanswers.blogspot.in/2012/07/idles-fine-but-rpm-jumps-in-drive-mode.html
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--------How to adjust rpm on 2009 dodge charger SRT8?


http://schematicsdiagram.blogspot.com/2011/12/how-to-adjust-rpm-on-2009-dodge-charger.html
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Engine cuts out at 3000 RPM?http://schematicsdiagram.blogspot.com/2011/12/engine-cuts-out-at-3000-rpm.html

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Cold start problem and vehicle shudder around 2500 to 3500 rpms
http://repairhelpcenter.blogspot.com/2012/10/cold-start-problem-and-vehicle-shudder.html

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2005 Toyota Highlander: Engine runs hard RPM below 3000?http://whatisbyme.blogspot.in/2012/05/2005-toyota-highlander-engine-runs-hard.html

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1987 Toyota Camry: RPM Drops going Up hills?http://whatisbyme.blogspot.in/2012/05/1987-toyota-camry-rpm-drops-going-up.html

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Cruise Control stops working, Excessive cranks to start the engine and RPM goes max 2500 http://whoisbyme.blogspot.in/2012/07/cruise-control-stops-workingexcessive.html

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1990 Toyota 4Runner: Engine cuts off when reaches 2000 RPM?


http://whatisbyme.blogspot.in/2012/05/1990-toyota-4runner-engine-cuts-off.html

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1999 Toyota Camry: Erratic stalling and high engine RPM at idle?


http://whatisbyme.blogspot.in/2012/05/1999-toyota-camry-erratic-stalling-and.html

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These will help.
Thanks.

Nov 22, 2012 | 2008 Toyota Avalon

1 Answer

I have a 1997 Yamaha 40hp....C40PLRV without oil injection. My Sealoc manual calls for a 100:1 fuel mix. I had a dealer tell me to run 50:1, but it idles rough and is hard starting when cold even with...


Mate.2 stroke motors WITH oil injection run between 100/1 and down to 40/1(rich).With yours being pre-mix,it should run at 50/1 to be safe.Using a good quality 2stroke oil,with low smoke,it should run well.The only thing that may change, is how you use the motor.Slow trolling or running along travelling.A spark plug that is 1 heat range hotter will help burn the fuel/oil mixture if you do a lot of slow running.Faster and /or high speed running,will keep your plugs ok.These are safe guides not to cook up a piston.Hope this helps you

Dec 06, 2010 | Boating

1 Answer

Galant 95 backfires and shuts down at higher rpms


check ur plug wires they might be mismatched ...joe

Aug 29, 2009 | 1995 Mitsubishi Galant

1 Answer

2007 crown vic 4.6 l idles high on startup


This sounds like a normal condition.What happens is the cold start emission reduction component monitor(software program in the computer) is running.
Cold Start Emission Reduction Component Monitor
The Cold Start Emission Reduction Component Monitor was introduced for the 2006 MY on vehicles that meet the
LEV-II emission standards. The monitor works by validating the operation of the components of the system
required to achieve the cold start emission reduction strategy, namely retarded spark timing and elevated idle
airflow.
When the CSER strategy is enabled, the idle air control system will request a higher idle rpm, elevating engine
airflow. While this CSER elevated airflow is requested, the low airflow test compares the measured idle airflow from
the MAF sensor to the commanded idle airflow from the idle air control strategy.


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2 Answers

Outboard motor won't run under load


I have 1969 5hp Johnson. Starts and runs good, but will only push a 14ft row boat slow at low to medium rpm. When at higher rpm the the motor just revs up and the boat slows down to almost nothing just like it has seaweed around prop.Any help would be great.

Jan 19, 2009 | Boating

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