Firefighter5602
Cadet
- Joined
- May 24, 2017
- Messages
- 20
I have a 1995 Monterey 225 BR with the Volvo-Penta 5.7 Gi that I bought last July. After getting it home I found a few things that I needed to fix before getting it on the water, mainly replacing the floor, stringers, motor mounts, transom gimble bearing, u-joints, carpet, lift cylinders bilge pump and billows. That is done now so I can finally focus on using it. I took it out for the first time 2 weeks ago to find out that it wouldn't rev past about 2,000 RPM. I found that the anti-siphon valve was a common culprit so I removed it. Problem solved, it ran great after that. I changed the fuel filter and put Seafoam in the tank to help clean the fuel system. It has all new fuel, the tank was emptied and removed during the floor replacement. I have 2 batteries that have a full fresh charge (just in case that is a question later). Fast forward 1 week of sitting in my barn.
We took the boat out and immediately after getting into the boat my wife informed me that there was something wrong with it. It was idling too high and kept dying. I started the boat and she was correct. It would start fine, idle about 1200 RPM for about 20 seconds then die. It would start right back up and do the same thing. I got it out of the idle only zone and opened it up and it ran like a top as long as it stayed above 2000 rpm. When I stopped it would die. I ran the boat around the lake for about an hour thinking it might be dirt in the fuel system somewhere and wanted to give the new fuel and Seafoam a chance to work. It never made a difference.
A couple of days later I got the chance to work on it at home and with the muffs on I ran the boat in my driveway. It started fine and ran up to about 2000 rpm and stayed there, it didn't die but wouldn't idle down. It will rev up just fine. I have done a ton of online searching and reading over the past few days and am at my wits end so I am finally posting about it. So far I have checked for vacuum leaks with none found, I have replaced the IAC with no change, I have replaced the MAP sensor with no change, I changed the fuel filter again with no change, I have disconnected, checked and reconnected every connector I can find on the engine with no change, I have tried (using the battery isolater switch) running with battery 1, battery 2 and both batteries with no change.
The only thing that makes any difference at all is when I unhook the vacuum hose for the MAP sensor and plug it off completely the boat will idle down to about 900 rpm however when I do this it will not rev up. Another note is that when it is running at 2000 rpm I can unplug the wires to the MAP and it doesn't change, I can also unplug the IAC with no change. Occasionally it will sound like it hiccups and will idle down but watching the injectors when it does this they completely shut off for a second then come right back on, it does not idle down. The motor sounds and runs great it just won't idle down.
When I started removing the floors in the boat I found a lot of the relays laying around the interior, and there is a spare fuel pump in the glove box. This leads me to believe the previous owner had issues with it also. I am fully understanding that the previous owner unloaded this boat on me, however I got it for a good price and still don't have money in it to be upside down, yet. I am what I consider a shade tree mechanic. I only have hand tools, no scan tools, no pressure guages, etc. I know this isn't the best situation but its the one I'm in. I would like to resolve this issue without having to take it somewhere and lose half the season and possibly thousands more than I would to fix it myself. The next part I'm thinking is the ECM. With the research I've done it looks like the culprit but wanted some more information and input on my specific situation before spending that money.
Sorry for the long post, I wanted to give all the info I had so I could get the best help possible. Thank you in advance!
Doug
We took the boat out and immediately after getting into the boat my wife informed me that there was something wrong with it. It was idling too high and kept dying. I started the boat and she was correct. It would start fine, idle about 1200 RPM for about 20 seconds then die. It would start right back up and do the same thing. I got it out of the idle only zone and opened it up and it ran like a top as long as it stayed above 2000 rpm. When I stopped it would die. I ran the boat around the lake for about an hour thinking it might be dirt in the fuel system somewhere and wanted to give the new fuel and Seafoam a chance to work. It never made a difference.
A couple of days later I got the chance to work on it at home and with the muffs on I ran the boat in my driveway. It started fine and ran up to about 2000 rpm and stayed there, it didn't die but wouldn't idle down. It will rev up just fine. I have done a ton of online searching and reading over the past few days and am at my wits end so I am finally posting about it. So far I have checked for vacuum leaks with none found, I have replaced the IAC with no change, I have replaced the MAP sensor with no change, I changed the fuel filter again with no change, I have disconnected, checked and reconnected every connector I can find on the engine with no change, I have tried (using the battery isolater switch) running with battery 1, battery 2 and both batteries with no change.
The only thing that makes any difference at all is when I unhook the vacuum hose for the MAP sensor and plug it off completely the boat will idle down to about 900 rpm however when I do this it will not rev up. Another note is that when it is running at 2000 rpm I can unplug the wires to the MAP and it doesn't change, I can also unplug the IAC with no change. Occasionally it will sound like it hiccups and will idle down but watching the injectors when it does this they completely shut off for a second then come right back on, it does not idle down. The motor sounds and runs great it just won't idle down.
When I started removing the floors in the boat I found a lot of the relays laying around the interior, and there is a spare fuel pump in the glove box. This leads me to believe the previous owner had issues with it also. I am fully understanding that the previous owner unloaded this boat on me, however I got it for a good price and still don't have money in it to be upside down, yet. I am what I consider a shade tree mechanic. I only have hand tools, no scan tools, no pressure guages, etc. I know this isn't the best situation but its the one I'm in. I would like to resolve this issue without having to take it somewhere and lose half the season and possibly thousands more than I would to fix it myself. The next part I'm thinking is the ECM. With the research I've done it looks like the culprit but wanted some more information and input on my specific situation before spending that money.
Sorry for the long post, I wanted to give all the info I had so I could get the best help possible. Thank you in advance!
Doug