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Jan 23rd, 2013
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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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Ringer1 Offline OP
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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

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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OPTI Offline
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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

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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Ringer1 Offline OP
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Originally Posted by OPTI
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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