9.9 sputters and dies above 1/2 throttle
Posted: Mon Apr 26, 2004 5:22 am
9.9 diagnosis
Posted by Dan Hofmann on April 22, 2002 at 07:30:00:
Wondering if anyone can lead me in the right direction on an engine problem
Already changed the carb and ruled that out. Thinking it must be electrical
Problem: start engine just fine,warm it up. When I give it power it spits and
sputters before running up. Under load it will only achieve half power even when
given full throttle. It also does this sporatically. After changeing carb, it
ran twice with out a problem, following morning it would not run up to power. If
I kept it up, it eventually stalled. Anyone who has this problem, I would like
to hear your final fix
Follow Ups:
Re: 9.9 diagnosis Dan Hofmann 03:15:45 04/25/02 (0)
Re: 9.9 diagnosis Bill Fischer 21:20:51 04/24/02 (1)
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Re: 9.9 diagnosis
Posted by Dan Hofmann on April 25, 2002 at 03:15:00:
In Reply to: Re: 9.9 diagnosis posted by Bill Fischer on April 24, 2002 at
21:20:00:
Thanks. Changing out the Carb sort of eliminated a dirty carb. I had pondered
that oil pressure and or a heat/wiring related problem also because that can
also shut you down. I will see if there is a way to test them,again thanks
Follow Ups:
Re: 9.9 diagnosis
Posted by Bill Fischer on April 24, 2002 at 21:20:00:
In Reply to: 9.9 diagnosis posted by Dan Hofmann on April 22, 2002 at 07:30:00:
I have heard that there is an automatic slow down for low oil pressure and that
changing the oil strainer will improve the pressure. It may be the oil pressure
sensor going bad. I am having a similar problem intermitantly. I believe the
previous owner did too. I have also read an article by Charles Kanter talking
about the same problem. most mechanics will say it is a dirty carb, your new one
may have a small piece of dirt. It does not take much.
Follow Ups:
Re: 9.9 diagnosis
Posted by Marc Gershel on April 22, 2002 at 11:39:00:
In Reply to: 9.9 diagnosis posted by Dan Hofmann on April 22, 2002 at 07:30:00:
Hi Dan. Have you checked the anti-siphon valves? I had a lot of problems until I
removed them.Try running from a remote tank to determine if there is an
obstruction in the fuel line. I had a problem where the inner wall of the fuel
line separated & was blocking the flow
Marc
Follow Ups:
Re: 9.9 diagnosis Dan Hofmann 03:38:27 04/23/02 (0)
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Re: 9.9 diagnosis
Posted by Dan Hofmann on April 23, 2002 at 03:38:00:
In Reply to: Re: 9.9 diagnosis posted by Marc Gershel on April 22, 2002 at
11:39:00:
Mark, My problem started on a test stand with fresh fuel. It was just sporatic
enough that I though It was gone when I swithced carb's and she ran fine the
first day I had re installed her on the boat
Thanks for the input
Posted by Dan Hofmann on April 22, 2002 at 07:30:00:
Wondering if anyone can lead me in the right direction on an engine problem
Already changed the carb and ruled that out. Thinking it must be electrical
Problem: start engine just fine,warm it up. When I give it power it spits and
sputters before running up. Under load it will only achieve half power even when
given full throttle. It also does this sporatically. After changeing carb, it
ran twice with out a problem, following morning it would not run up to power. If
I kept it up, it eventually stalled. Anyone who has this problem, I would like
to hear your final fix
Follow Ups:
Re: 9.9 diagnosis Dan Hofmann 03:15:45 04/25/02 (0)
Re: 9.9 diagnosis Bill Fischer 21:20:51 04/24/02 (1)
--------
Re: 9.9 diagnosis
Posted by Dan Hofmann on April 25, 2002 at 03:15:00:
In Reply to: Re: 9.9 diagnosis posted by Bill Fischer on April 24, 2002 at
21:20:00:
Thanks. Changing out the Carb sort of eliminated a dirty carb. I had pondered
that oil pressure and or a heat/wiring related problem also because that can
also shut you down. I will see if there is a way to test them,again thanks
Follow Ups:
Re: 9.9 diagnosis
Posted by Bill Fischer on April 24, 2002 at 21:20:00:
In Reply to: 9.9 diagnosis posted by Dan Hofmann on April 22, 2002 at 07:30:00:
I have heard that there is an automatic slow down for low oil pressure and that
changing the oil strainer will improve the pressure. It may be the oil pressure
sensor going bad. I am having a similar problem intermitantly. I believe the
previous owner did too. I have also read an article by Charles Kanter talking
about the same problem. most mechanics will say it is a dirty carb, your new one
may have a small piece of dirt. It does not take much.
Follow Ups:
Re: 9.9 diagnosis
Posted by Marc Gershel on April 22, 2002 at 11:39:00:
In Reply to: 9.9 diagnosis posted by Dan Hofmann on April 22, 2002 at 07:30:00:
Hi Dan. Have you checked the anti-siphon valves? I had a lot of problems until I
removed them.Try running from a remote tank to determine if there is an
obstruction in the fuel line. I had a problem where the inner wall of the fuel
line separated & was blocking the flow
Marc
Follow Ups:
Re: 9.9 diagnosis Dan Hofmann 03:38:27 04/23/02 (0)
--------
Re: 9.9 diagnosis
Posted by Dan Hofmann on April 23, 2002 at 03:38:00:
In Reply to: Re: 9.9 diagnosis posted by Marc Gershel on April 22, 2002 at
11:39:00:
Mark, My problem started on a test stand with fresh fuel. It was just sporatic
enough that I though It was gone when I swithced carb's and she ran fine the
first day I had re installed her on the boat
Thanks for the input