Jimmy Buoy
Well-Known Member
- Dec 3, 2008
- 2,471
- Boat Info
- 2003 Cobalt 293
- Engines
- Twin Volvo-Penta 5.0 270hp & DuoProps
Hi All, Quite a day today. Finally got the boat splashed today for the first time this year after doing some heavy repair work on the drives and transom assemblies. Things were going rather well for the first hour or so with the boat running well. Then after a quicker run, I decided to take a look at the ER again and found that the STB Water Distribution Housing had come apart at the seam and spewed water all over the ER and other engine. I had just replaced this part with a new one since the old one had cracked where the blue plug screwed into the housing. Great...
Fortunately the engines are fed water from through hull fittings, so the fitting for Stb was shut off to give the bilge pump a break. We then started limping back using the Port Engine which was set at 1150 RPM making about 5.5mph and after about an hour and getting near our destination, the engine began to stumble and began to lower its RPM. I decided to bump up the RPM to 1500 quickly before it died and the engine responded by gaining new legs and ran fine at 1500RPM until back to the marina.
Problem was as soon as the engine speed was reduced the engine started slowing down again and headed for a stall. That was going to make docking fun. I decided to open the Stb water valve, start up the engine for docking and let'r wash the bilge some more.
Any ideas? What RPM does the IAC stop being a factor?? Could a plugged up fuel/water separator cause this (thinking not since it ran great at 4500RPM an hour before).
I hooked up my Rinda Analyzer which showed "no codes" but the fuel pressure was listed as 2.1 psi - seems very low. The engine was running very cool as well with the temps showing the high 90's throughout the afternoon which seems odd, but it should still run ok even cold.
Fortunately the engines are fed water from through hull fittings, so the fitting for Stb was shut off to give the bilge pump a break. We then started limping back using the Port Engine which was set at 1150 RPM making about 5.5mph and after about an hour and getting near our destination, the engine began to stumble and began to lower its RPM. I decided to bump up the RPM to 1500 quickly before it died and the engine responded by gaining new legs and ran fine at 1500RPM until back to the marina.
Problem was as soon as the engine speed was reduced the engine started slowing down again and headed for a stall. That was going to make docking fun. I decided to open the Stb water valve, start up the engine for docking and let'r wash the bilge some more.
Any ideas? What RPM does the IAC stop being a factor?? Could a plugged up fuel/water separator cause this (thinking not since it ran great at 4500RPM an hour before).
I hooked up my Rinda Analyzer which showed "no codes" but the fuel pressure was listed as 2.1 psi - seems very low. The engine was running very cool as well with the temps showing the high 90's throughout the afternoon which seems odd, but it should still run ok even cold.