Mercruiser 7.4 sputter, misfire

[Lespaulguy]

Hi All,

Love this forum, thanks to all the participators, certainly a wealth of information!

Here is my issue Im hoping to get feed back. I have mercruiser 7.4 in my 96 Baja 232 performance and took it out yesterday and while running, runs ok but then has a sputter/misfire to it...As I Feel that, I gave it throttle and seems to help it, but will do it again after. I noticed at one point it ran around 4K Rpm for a good, 5-10 minutes without a single misfire/sputter, but then started to do it again. Not sure if Im dealing with something electrical, or fuel?

Would greatly appreciate any input/advice.


Thanks~!

 

[Bondo]

Re: Mercruiser 7.4 sputter, misfire

Hi All,

Love this forum, thanks to all the participators, certainly a wealth of information!

Here is my issue Im hoping to get feed back. I have mercruiser 7.4 in my 96 Baja 232 performance and took it out yesterday and while running, runs ok but then has a sputter/misfire to it...As I Feel that, I gave it throttle and seems to help it, but will do it again after. I noticed at one point it ran around 4K Rpm for a good, 5-10 minutes without a single misfire/sputter, but then started to do it again. Not sure if Im dealing with something electrical, or fuel?

Would greatly appreciate any input/advice.


Thanks~!

Ayuh,.... Welcome Aboard,... Start by checkin' the contents of the fuel filter for water, 'n crud,...

 

[Lespaulguy]

Re: Mercruiser 7.4 sputter, misfire

Ayuh,.... Welcome Aboard,... Start by checkin' the contents of the fuel filter for water, 'n crud,...

Brand new Fuel filter was put in the day before going in the water, so that cant be it.

Any othere ideas?

 

[Bondo]

Re: Mercruiser 7.4 sputter, misfire

Brand new Fuel filter was put in the day before going in the water, so that cant be it.

Any othere ideas?

Ayuh,.... So yer good with Assumin' it's Ok, 'n what was in the tank was Ok,...

 

[Lespaulguy]

Re: Mercruiser 7.4 sputter, misfire

Ayuh,.... So yer good with Assumin' it's Ok, 'n what was in the tank was Ok,...

Good point I guess...I will look at it.

I was thinking more in the point of I was having a electric issue or fuel issue.

 

[Lespaulguy]

Re: Mercruiser 7.4 sputter, misfire

Thought I would post an update.
Had a mecanic friend come to my place to look at the boat, and after a few trials, noticed corrosion in the connector for the computer board on the motor (Sorry, I dont know the technical term, white/green, white/red wires going to distributor). Cleaned that up, and boat purrs like a kitten.

There really wasnt alot of corrosion on there, I was amazed by how such lil corrosion would wreak havoc.

Happy boating!

 

[Bondo]

Re: Mercruiser 7.4 sputter, misfire

Thought I would post an update.
Had a mecanic friend come to my place to look at the boat, and after a few trials, noticed corrosion in the connector for the computer board on the motor (Sorry, I dont know the technical term, white/green, white/red wires going to distributor). Cleaned that up, and boat purrs like a kitten.

There really wasnt alot of corrosion on there, I was amazed by how such lil corrosion would wreak havoc.

Happy boating!

Ayuh,.... Any visible corrosion is Waayyy to Much,.....