2008 3.0L mercruiser backfiring

J

Joseph_S

Recruit
Joined
May 30, 2012
Messages
3
"I have a 3.0 L mercruiser in my 2008 Bayliner 192 CU and when the engine gets to operating Temperature of 175 deg, and when I increase the rpm above 1300, it sounds like it's going to die and it back fires. At lower rpm it sounds normal and no back firing. Also a lower temperature it does not back fire even when I rev it up to 2000 rpm. what should I look ..."

Joseph
 
Don S

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: 2008 3.0L mercruiser backfiring

Sounds like it's running lean.
 
J

Joseph_S

Recruit
Joined
May 30, 2012
Messages
3
Re: 2008 3.0L mercruiser backfiring

Thanks Don,
This started after I was running at higher speed ( 3600- 4000 rpm) on a rough sea for about 45 min. how could the fuel mixture change?

Joseph
 
Don S

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: 2008 3.0L mercruiser backfiring

Dirt or water in the carb will do it.
Do you have a water separating fuel filter installed? Has the filters in the fuel pump and carb been changed lately?
 
J

Joseph_S

Recruit
Joined
May 30, 2012
Messages
3
Re: 2008 3.0L mercruiser backfiring

Don S said:
Dirt or water in the carb will do it.
Do you have a water separating fuel filter installed? Has the filters in the fuel pump and carb been changed lately?
Click to expand...

This engine had about 100 hours when I got a water separator installed last year and after this install I put another 50 hours before I got this problem.

no, the filters were never changed,

Joseph
 
You must log in or register to reply here.
Top