Engine Stalled when slowing down from 3400 RPMS. Wouldn't Restart

mnowicki

Cadet
Joined
Feb 25, 2008
Messages
14
Was out on the lake cruising @ about 3400 rpms (25 mph) for about 20 minutes. went to Slow down & the engine stalls out???
Would not restart. Waited a 1/2 hour and still no restart..

Got towed back in to the ramp, drove home Checked a bunch of things... everything seemed OK... Hooked it up to the hose and the engine fired right up and ran fine..

A simialr thing happened earlier in the season.. slowed down from around 3000 rpm's to near idle when I seen sosmething in the water at the last minute and she stalled.. But she started right up and after navigating around the log we were on our way again.

So the question is what makes the engine die like that?
Can I fix it? If I can't then how do I get around it?

Engine is a 3.0 4-cyl Mercruiser 140 HP besides this the engine seems ot run very well.

Any help would be appreciated....Thanks
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
70,525
Re: Engine Stalled when slowing down from 300 RPMS. Wouldn't Restart

Re: Engine Stalled when slowing down from 300 RPMS. Wouldn't Restart

Was out on the lake cruising @ about 3400 rpms (25 mph) for about 20 minutes. went to Slow down & the engine stalls out???
Would not restart. Waited a 1/2 hour and still no restart..

Got towed back in to the ramp, drove home Checked a bunch of things... everything seemed OK... Hooked it up to the hose and the engine fired right up and ran fine..

A simialr thing happened earlier in the season.. slowed down from around 3000 rpm's to near idle when I seen sosmething in the water at the last minute and she stalled.. But she started right up and after navigating around the log we were on our way again.

So the question is what makes the engine die like that?
Can I fix it? If I can't then how do I get around it?

Engine is a 3.0 4-cyl Mercruiser 140 HP besides this the engine seems ot run very well.

Any help would be appreciated....Thanks

Ayuh,.... When it won't start,...
Check for Fuel, 'n Fire....

One of 'em is Missing....
 

mnowicki

Cadet
Joined
Feb 25, 2008
Messages
14
Re: Engine Stalled when slowing down from 300 RPMS. Wouldn't Restart

Re: Engine Stalled when slowing down from 300 RPMS. Wouldn't Restart

Ayuh,.... When it won't start,...
Check for Fuel, 'n Fire....

One of 'em is Missing....

Could it have just been too much fuel? flooded out?

But..What causes the engine stall like that?
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
70,525
Re: Engine Stalled when slowing down from 300 RPMS. Wouldn't Restart

Re: Engine Stalled when slowing down from 300 RPMS. Wouldn't Restart

But..What causes the engine stall like that?

Well,... After it dies, Check to see what's missing,...
Then figure out Why....

It Could be a fuel delivery issue,...
or,..
It Could be loss of Ignition....
 

mnowicki

Cadet
Joined
Feb 25, 2008
Messages
14
Re: Engine Stalled when slowing down from 300 RPMS. Wouldn't Restart

Re: Engine Stalled when slowing down from 300 RPMS. Wouldn't Restart

Guess I was hoping for some help in the steps to troubleshoot this.... figue it has somethinmg to do with gas or spark.. Where/what do I start with to start isolating

Cap/rotor/Points/Condensor? Carb rebuild? fuel filter? there is no fuel//water separator... don't see a fuel filter so I beleive there is only the one in the fuel pump??? Seems to me that even though the engine SEEMS to be running fine now there are things that may be marginal now that could be leading to the problem and I would like to start going through those items that could lead to this condition and start verifying that things are good,,,
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
70,525
Re: Engine Stalled when slowing down from 300 RPMS. Wouldn't Restart

Re: Engine Stalled when slowing down from 300 RPMS. Wouldn't Restart

Guess I was hoping for some help in the steps to troubleshoot this....

Ayuh,.... When it won't start,....

Pull the sparkplugs...
Are they Wet with gas, or Dry,..??
Are they Sparkin',..??
Is there gas shootin' in the carb when the throttle is pumped,..??
 

mnowicki

Cadet
Joined
Feb 25, 2008
Messages
14
Re: Engine Stalled when slowing down from 300 RPMS. Wouldn't Restart

Re: Engine Stalled when slowing down from 300 RPMS. Wouldn't Restart

At the time we pulled plugs and found Cyl 1 & 2 to be dry... Cyl 3 was wet with gas...

Gas in carb too...

But in taking off plug wire 3 the wire came out of the boot and that was it.. Cal for the Tow boat with no way to fix the wire..

But after plugging in new plug wires it fired up fine..(4 hrs later)
 
Top