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Dec 30th, 2023
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 99 Merc 150 EFI 2 Stroke - Hard to start when warm
#13634354
07/17/20 07:08 PM
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Joined: May 2006
Posts: 453
Ringer1
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OP
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Posts: 453 |
The motor will start just fine at the ramp. But once it's warm I have to tilt the motor all the way up and throw it into gear when it seems like it wants to start.
I've changed the spark plugs and the fuel filter. The water separator is next. But I wanted to see what you guys thought it could be. TIA
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Re: 99 Merc 150 EFI 2 Stroke - Hard to start when warm
[Re: Ringer1]
#13634541
07/17/20 09:15 PM
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Joined: Jun 2004
Posts: 1,509
OPTI
Extreme Angler
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Extreme Angler
Joined: Jun 2004
Posts: 1,509 |
Sounds like the the ECM thinks it is still cold which is controlled by the port head temp sensor could be bad or make sure it is not unplugged .....OPTI
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Re: 99 Merc 150 EFI 2 Stroke - Hard to start when warm
[Re: OPTI]
#13634680
07/17/20 11:36 PM
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Joined: May 2006
Posts: 453
Ringer1
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Posts: 453 |
Sounds like the the ECM thinks it is still cold which is controlled by the port head temp sensor could be bad or make sure it is not unplugged .....OPTI
I'll pull up the schematics and see if I can find the sensor. Thank you for the response.
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Re: 99 Merc 150 EFI 2 Stroke - Hard to start when warm
[Re: OPTI]
#13662261
08/10/20 01:22 AM
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Joined: May 2006
Posts: 453
Ringer1
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This the only temp sensor I can find on the schematic. I don’t see anything that says “port temperature sensor”. Is this what your talking about? Temp sensor
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Re: 99 Merc 150 EFI 2 Stroke - Hard to start when warm
[Re: Ringer1]
#13663295
08/10/20 09:29 PM
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Joined: Jun 2004
Posts: 1,509
OPTI
Extreme Angler
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Extreme Angler
Joined: Jun 2004
Posts: 1,509 |
The picture your asking about is the manifold air temp sensor. The part # for the sensor Iam talking about is 13536 A14 if you go into Crowley Marine and enter this # it will show a picture of sensor It is the port cylinder head temp sensor The starboard sensor is just for the warning horn. .... OPTI
Last edited by OPTI; 08/11/20 09:52 PM.
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Re: 99 Merc 150 EFI 2 Stroke - Hard to start when warm
[Re: OPTI]
#13666138
08/13/20 02:54 AM
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Joined: May 2006
Posts: 453
Ringer1
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Angler
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OP
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Joined: May 2006
Posts: 453 |
Perfect!!! Thanks OPTI!!!!
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Re: 99 Merc 150 EFI 2 Stroke - Hard to start when warm
[Re: Ringer1]
#13666984
08/13/20 10:43 PM
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Joined: Jun 2004
Posts: 1,509
OPTI
Extreme Angler
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Extreme Angler
Joined: Jun 2004
Posts: 1,509 |
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