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  88 Johnson stalling @ end of run

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Author Topic:   88 Johnson stalling @ end of run
John O posted 06-23-2002 09:21 PM ET (US)   Profile for John O  
1988 Johnson 88hp on Newtauk keeps stalling in neutral when I am putting into the harbor. I have keep boat @ no wake for about 15 mins after I reach harbor and approach slip. Just before I dock (or try to) motor cuts out in neutral and then must be started in advance neutral. I am new to boating and have only had motor at full throttle for less than 5 mins @ a time. I ahve been only out on boat 5 times so far for short runs less than 11/2 hours. Is this a carb problem or coils? any advice would be helpful. motor seem to struggle at lowest speed possible.
jimh posted 06-23-2002 10:35 PM ET (US)     Profile for jimh  Send Email to jimh     
Check the setting of the idle speed. Perhaps it is too low. Increase idle speed setting. See your manual for proper idle speed RPM and adjustment procedure.

Perhaps your plugs get fouled after 15-minutes of running at low speed. Check your oil-fuel mix.

Check your plugs--maybe they are improperly gapped. They may even be not the proper plugs. It is not uncommon for previous owner ( I have deduced from you comments you recently bought this boat used) put in the worng plugs, wrong gap, etc.

Start with fresh fuel, proper oiling mix, and fresh set of new plugs, properly installed and gapped. The OEM plug will probably be a Champion brand. In 1988 they were quite popular, but now 14 years later you might try another brand like NGK. (NGK seems to be the most commonly used OEM plug these days; many are made in California although the parent company is in Japan.)

As a last resort, try Denso plugs, but handle them carefully. They contain trace elements of rare earths known to cause unstable behavior.

John O posted 06-23-2002 10:40 PM ET (US)     Profile for John O    
Wow you read my mind! i was just looking back and found some info spark plugs.. are denso's worth it? My plugs seem wet . i have cleaned them 2 x this weeks. motor runs well at all other speeds
John O posted 06-23-2002 10:47 PM ET (US)     Profile for John O    
"Unstable Behavior" in the handler or motor?
Humm
gunnelgrabber posted 06-24-2002 11:31 AM ET (US)     Profile for gunnelgrabber  Send Email to gunnelgrabber     
jimh,
that's curious...are you laying some real electronic esoterica on us? ...or? as i'm inclined to think... are you baiting up whalernut?
stay tuned....lm

MarkM posted 06-24-2002 02:50 PM ET (US)     Profile for MarkM  Send Email to MarkM     
In our case, Johnson 150, it was a matter of replacing the fuel/water filter/separator.

Thanks,
-Mark

Cpt Quint posted 06-24-2002 03:15 PM ET (US)     Profile for Cpt Quint  Send Email to Cpt Quint     
Thats correct acceplt the spl 88 has no seperator. The issue is the gas line, probably either the primer bulb or the fuel filter which a novice can pop off and clean.
I wouldnt think the mixture would be the culprit but at low idle speed the gas is not getting pulled in properly.
Jay A posted 06-25-2002 12:19 AM ET (US)     Profile for Jay A    
John, When plugs are a culprit they usually foul up when you increase power, but loss of power at the lower end could very well be the fuel. I believe Capt. Quint hit the nail on the head! I had this problem when I had an Evinrude on my Whaler.In my case the clamps around the primer bulb were failing.
John O posted 06-25-2002 10:00 AM ET (US)     Profile for John O    
The fuel line, primer bulb and connectors are all new. Ran boat yesterday for 1/2 hour and agian experienced cutting out in neutral while docking.
jimh posted 06-25-2002 10:10 AM ET (US)     Profile for jimh  Send Email to jimh     
Perhaps the problem is related to temperture. As the engine becomes thoroughly warmed, a component begins to fail.
Cpt Quint posted 06-25-2002 10:22 AM ET (US)     Profile for Cpt Quint  Send Email to Cpt Quint     
1st I would look at the filter to make certain nothing is constricting the flow.

When the motor cuts off is there gas/pressure in the primer bulb? If not than
it may mean your fuel pump is wearing out.
(only about $50 part). If its still under pressure that its got to either be that filter or the idle is too low after warm up.
There is a screw adjustment off the throttle for that.
John O posted 06-25-2002 04:43 PM ET (US)     Profile for John O    
thanks for all the advice. I will start the process of elimination this week.
Jay A posted 06-25-2002 06:54 PM ET (US)     Profile for Jay A    
If it only konks-out when you put it in neutral then a good bet is the throttle linkage or carburator needs adjusting.Most mechanics will set the throttle as low as possible so the engine will accomadate trolling.Over time due to the environment and/or vibration these settings can and usually will get out of sync.

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