dean28dean 0 Report post Posted October 22, 2014 Hello, I own a Monterey CR250 2006 model with a Volvo 5.0 Penta GXI duo prop stern drive. Now it won’t rev above 3000rpm when under load, this problem I had before it was serviced, before it was serviced the problem was more intermittent sometimes it would get up to speed and other times it wouldn't, now it just won’t. When in neutral it revs perfectly it’s when it is under load it will only reach 3000rpm which doesn’t even get it up on the plane. Has anyone got any ideas on what the issue could be? I run the boat in Bermuda so it’s in salt water. Any assistance would be greatly appreciated. Share this post Link to post Share on other sites
GetAway 0 Report post Posted October 25, 2014 I ran into the same problem with a 5.7l GS Volvo, duel prop like yours, a 242 CR, I went to a place that tuned my engine up but didn't do it while the boat was in the water. I could only get up to 4000 rpm and it use to get upto 4800 rpm. I put the boat in salt water like you and retuned the engine myself. The timing was off a little. I tuned by the timing mark then by ear and I'm back upto 4800 rpms. My engine is carberated not electronic. I believe your engine is fuel injected so you have electronics that manage your engine. I have an 1988 Corvette with a 5.7 engine that has one plug that has one wire that has to be unplugged then you can time the engine using the timing mark on the flywheel. This may be the case with your engine, I'm not sure, I don't know anything about your engine but this is what I would look for. See if you can find a shop manual for your engine and that may show you what to do to be able to disengage the electronic timing so you can tune. Electronics are great when they work right but a pain to troubleshoot when they don't. Share this post Link to post Share on other sites
