Mercruiser EFI needs throttle to start
 

Hi folks

I recently bought a Bayliner 2755 with a Mercruiser 5.4l EFI engine.
it's got about 270 hours on it. When we bought the boat about a month
ago, it fired right up. First trip out overnight we flattened all the
batteries so have since replaced them with 3 AGM 120aH batteries. The
people that replaced them said the old batteries appeared "cooked" and
checked the alternator and found it was putting out too much power.
Since fixed.

Now, to today. The boat will start no problem, but it needs the
throttle to be opened up (in neutral) to kick over. I then lower the
revs and let it sit on about 1000 rpm to idle for a few minutes. I
can then drop it back to sit idling at around the 600 mark. It'll
then be fine. But...with a EFI motor I shouldn't have to do this.

Before I give the go ahead for the mechanics to tune and service the
injectors (and incur about $300 in charges), I was wondering if there
could be an electrical/fuse issue? When we took the boat out first,
there were a few fuses actually disconnected in the power box, and we
put them in place.

Any help greatly appreciated.

Kevin

Mercruiser EFI needs throttle to start
 

On Apr 1, 6:52*pm, wrote:
Hi folks

I recently bought a Bayliner 2755 with a Mercruiser 5.4l EFI engine.
it's got about 270 hours on it. *When we bought the boat about a month
ago, it fired right up. First trip out overnight we flattened all the
batteries so have since replaced them with 3 AGM 120aH batteries. The
people that replaced them said the old batteries appeared "cooked" and
checked the alternator and found it was putting out too much power.
Since fixed.

Now, to today. *The boat will start no problem, but it needs the
throttle to be opened up (in neutral) to kick over. *I then lower the
revs and let it sit on about 1000 rpm to idle for a few minutes. *I
can then drop it back to sit idling at around the 600 mark. *It'll
then be fine. *But...with a EFI motor I shouldn't have to do this.

Before I give the go ahead for the mechanics to tune and service the
injectors (and incur about $300 in charges), I was wondering if there
could be an electrical/fuse issue? *When we took the boat out first,
there were a few fuses actually disconnected in the power box, and we
put them in place.

Any help greatly appreciated.

Kevin

Oh, and I've checked the kill switch lanyard. :)

Kevin

Mercruiser EFI needs throttle to start
 

"knugent" wrote in message
...
On Apr 1, 6:52 pm, wrote:
Hi folks

I recently bought a Bayliner 2755 with a Mercruiser 5.4l EFI engine.
it's got about 270 hours on it. When we bought the boat about a month
ago, it fired right up. First trip out overnight we flattened all the
batteries so have since replaced them with 3 AGM 120aH batteries. The
people that replaced them said the old batteries appeared "cooked" and
checked the alternator and found it was putting out too much power.
Since fixed.

Now, to today. The boat will start no problem, but it needs the
throttle to be opened up (in neutral) to kick over. I then lower the
revs and let it sit on about 1000 rpm to idle for a few minutes. I
can then drop it back to sit idling at around the 600 mark. It'll
then be fine. But...with a EFI motor I shouldn't have to do this.

Before I give the go ahead for the mechanics to tune and service the
injectors (and incur about $300 in charges), I was wondering if there
could be an electrical/fuse issue? When we took the boat out first,
there were a few fuses actually disconnected in the power box, and we
put them in place.

Any help greatly appreciated.

Kevin

Oh, and I've checked the kill switch lanyard. :)

Kevin

A bad regulator in an alternator can raise havoc with all sorts of things,
especially electronics. With electronic ignition and electronic fuel
injection, you probably have a fried module or sensor. The only way to fault
find in these systems is with electronic test equipment. Since the boat is
new to you, it would be a good idea to have it thoroughly checked out. I
wouldn't mess with the fuel injectors on a hunch or even an educated guess.