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Port Engine Stalling

S

Silverton 31

New member
Began by having initial stalling by both engines. Discovered gasoline lost its fire power. Removed the entire contents of the 200-gallon fuel tank and replaced with fresh fuel. Replaced all the electronic parts distributors, ignition coils, external resistors, Chrysler ECMs of both Chrysler Marine 318's. Replaced all fuel lines copper and hose as well as the fuel/water separators and inline filters. Replaced fuel pumps (new) Had professional carburetor rebuilt both Edelbrock. Added the required Startron additive. Replaced all 16 spark plugs, and wires. I discovered a NEW defective coil (incorrect ohms) and one wire set had 3 bad wires which were replaced. After 3 boating seasons wasted, I now have the Starboard engine properly operating. Port engine will idle normal I can leave the slip and get above idle, then after 4 miles it will begin to lose rpms, tachometer jumps (indication stalling will occur) then stalls. Will fire back up but from that point will continue to stall. My son ordered a new Edelbrock carburetor. Installed and no improvement. OUT OF SOLUTIONS!
 
Thank you for your reply. Both engines were completely rebuilt in 2010. I worked closely with the speed shop in replacing what was needed. There is only 232 total hours on the engines. The rebuilds were done with 672 hours on each. Wasn't needed but to rebuild an uncertain reliability of one transmission (V drive) the engine had to come out. If you do one, the other should be done.
As far as loosing spark, hard to diagnose! RPM's drop, Tachometer jumps around then engine shuts off. Put in neutral, turn on the ignition and it starts up. At times it has trouble running smooth. Worse time is in approaching the slip when stalling occurs.
Any thoughts?
 
So the engines were rebuilt a while ago...my guess is the wiring (and instrument cluster is original??

On the spark check, not hard at all...a clip on timing light over the coil wire is one way....sometimes, an extra set of hands & eyes is worth the effort to coordinate.

When the engine stalls out, its either a fuel issue or an ignition issue...you gotta figure out which branch the problem is in or you'll be spending a lot of money on parts until you get lucky...
 
Thank you for your input. Here is what has happened. Three years ago, my performance issues began. My engines began stalling mostly when I was docking. I did everything to eliminate the problem. All electronic components were replaced. Plugs, wires, ignition coil, external resister, distributers, wiring up to the ignition switches. Then I concentrated on the fuel system. Fuel lines, new fuel pumps, filters, carburetors were professionally rebuilt and tested. I decided to remove a sample of the gasoline and tested it in a safe fashion away from danger by bringing the sample home. I lit the open container and the flame extinguished rapidly. I lit a second container with fresh fuel and the container stayed lit until all evaporated. My conclusion was that over 100 gallons of fuel was useless. I removed the fuel from the tank and properly disposed of it.
Fresh fuel was the replacement. The starboard engine is back to normal performance. The port engine is still not reliable, so I went to the expense of purchasing a new (not rebuilt) carburetor. Performance is not improved.
When the port engine stalls, it will start up as soon as the shift is put neutral, and key is engaged. I believe that electric breakdown would not allow instant restart.
Any ideas?
 
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