Mercruiser 5.0 EFI Starting Issues

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blackspot3

Recruit
Joined
Jul 26, 2008
Messages
3
I have a 2001 Sea ray 210 BR with a the Mercruiser 5.0 EFI. It usually starts great, but once it get warmed up, I get a lot of black smoke and occasionally it will crank and crank and will only start if I go full throttle. When it does start, it sputters a bit, blows a lot of black (not blue) smoke and then runs fine. What should I do? The local shop said they fixed a vacuum line and that was the culprit, but it is still doing it.
 
danond

danond

Lieutenant Junior Grade
Joined
Jun 11, 2007
Messages
1,118
Re: Mercruiser 5.0 EFI Starting Issues

Tell them to pull ECU codes. If it's running that poorly, it should be noting an out-of-whack condition at one of the sensors.
 
H

how much

Cadet
Joined
Jun 5, 2009
Messages
8
Re: Mercruiser 5.0 EFI Starting Issues

Black smoke indicates an overly rich mixture. I would suspect a faulty MAP sensor. A scan tool will show the real time readings from the sensor.
 
bustermin

bustermin

Banned
Joined
Apr 13, 2009
Messages
315
Re: Mercruiser 5.0 EFI Starting Issues

black smoke means too much fuel and not enough oxygen, in other words bad fuel mixture. but thats basically repeating whats already been said.
 
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