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Dec 30th, 2023
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 150 hp merc efi
#11701198
07/02/16 05:51 PM
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Joined: Apr 2012
Posts: 499
rlfisher
OP
Angler
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OP
Angler
Joined: Apr 2012
Posts: 499 |
Motor runs rough but does not die fishing Roberts yesterday and alarm kept going off stopped checked what I could on lake has oil and working [censored] hole has good stream of water alarm sounds at all speeds and just sitting with motor running but is intermittent goes off then silent then back on anyone know where to start looking for problems thanks for your help
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Re: 150 hp merc efi
[Re: rlfisher]
#11701220
07/02/16 06:16 PM
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Joined: May 2003
Posts: 11,586
gary purdy
TFF Guru
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TFF Guru
Joined: May 2003
Posts: 11,586 |
First is the alarm constant horn or an intermittent beep? Water in the fuel? Pull cowling and check red light warning for water.
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD
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Re: 150 hp merc efi
[Re: rlfisher]
#11701572
07/02/16 10:23 PM
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Joined: Apr 2012
Posts: 499
rlfisher
OP
Angler
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OP
Angler
Joined: Apr 2012
Posts: 499 |
Most of the time it was a continuous horn blow I could slow down in speed and then it would beep five or six times then stop going slow 2500 rpm or lower it just beep speed up continue long soild sound
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Re: 150 hp merc efi
[Re: rlfisher]
#11703645
07/04/16 02:00 PM
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Joined: Dec 2014
Posts: 1,665
Muzzlebrake
Extreme Angler
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Extreme Angler
Joined: Dec 2014
Posts: 1,665 |
My 2003 150efi did the same thing the other day. I was running 5600 rpm for about a mile and the alarm started screaming. Engine started and idled fine but missed and cut out at about 3500rpm just before getting on pad. Limped back to ramp and loaded up. Engine block was real hot to touch. Checked compression and still have 125psi in all 6 holes. Changed plugs and back flushed engine when I got home. Looked like I blew out a bunch of sand and dirt and the tell tale stream increased a bunch. My oil reservoir is still full. Haven't been back out to test but hoping the fail safes of the computer cause the engine missing and cutting out and it will be OK after the maintenance and cooling off.
From Genesis: "And God promised men that good and obedient wives would be found in all corners of the earth."
Then He made the earth round...and He laughed and laughed and laughed!
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Re: 150 hp merc efi
[Re: rlfisher]
#11703829
07/04/16 04:21 PM
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Joined: Nov 2006
Posts: 2,848
TLW
Extreme Angler
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Extreme Angler
Joined: Nov 2006
Posts: 2,848 |
Most of the time it was a continuous horn blow I could slow down in speed and then it would beep five or six times then stop going slow 2500 rpm or lower it just beep speed up continue long soild sound overheat!... put a complete water pump kit in it....
Last edited by TLW; 07/04/16 04:22 PM.
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Re: 150 hp merc efi
[Re: rlfisher]
#11704291
07/04/16 09:55 PM
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Joined: Feb 2006
Posts: 3,765
bronco71
TFF Team Angler
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TFF Team Angler
Joined: Feb 2006
Posts: 3,765 |
water pump or thermostats
1987 Nitro MX185/Mercury Black Max 150
1999 Triton TX21/225 Mercury Optimax
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Re: 150 hp merc efi
[Re: rlfisher]
#11704490
07/05/16 01:04 AM
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Joined: Apr 2012
Posts: 499
rlfisher
OP
Angler
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OP
Angler
Joined: Apr 2012
Posts: 499 |
Thanks everyone going to put water pump kit and two new thermostats in it
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