Engine Sputtering


Old 06-12-07, 04:03 PM
Thread Starter
Join Date: Sep 2005
Posts: 13
Engine Sputtering

I have a 1-year old Mercruiser Alpha1 4.3L (carburated) I/O engine on my '06 Mariah bowrider.

Now everytime I shut off the engine (after being warmed up), it sputters and "coughs" for a good 15-20 seconds before finally shutting off. Almost immediately you could smell gasoline fumes coming off the enclosed engine compartment. I started experiencing this problem the last couple of times I've taken the boat out, after aproximately 50 total engine hours.

What could be causing this problem?

Any suggestions are greatly appreciated. Thanks, Andy
Sponsored Links
Old 06-21-07, 02:50 PM
Join Date: Aug 2005
Posts: 2,268
your engine is dieseling.... a condition caused by the ignition of fuel due to compression rather than a spark. There are a number of conditions that can cause this ranging from too high an idle speed - to a carburator not closing completely when shut down - to incorrect timing. Do a google on the subject for more details and possible fixes.....
Old 06-21-07, 03:35 PM
Thread Starter
Join Date: Sep 2005
Posts: 13
Thumbs up

Thank you very much for the info thezster. Ill google it to see what I come up with. On a good note, I just find out the engine's still under manufacturer warranty so I will schedule a service appointment to have this problem checked out.

I do appreciate your input/Andy

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Display Modes