XCR1250 Posted July 3, 2021 Share Posted July 3, 2021 Anyone know good Mercury outboard forums?? Quote Link to comment Share on other sites More sharing options...
Gold Member EvilBird Posted July 3, 2021 Gold Member Share Posted July 3, 2021 What HP motor? Offshoreonly has a lot of good tech info but just for the Big horsepower Merc outboards. Quote Link to comment Share on other sites More sharing options...
XCR1250 Posted July 3, 2021 Author Share Posted July 3, 2021 22 minutes ago, EvilBird said: What HP motor? Offshoreonly has a lot of good tech info but just for the Big horsepower Merc outboards. 225 Optimax Quote Link to comment Share on other sites More sharing options...
Gold Member EvilBird Posted July 3, 2021 Gold Member Share Posted July 3, 2021 (edited) Try scream and fly . Com Usually some good tech guys there https://www.screamandfly.com/forumdisplay.php?20-Technical-Discussion&s=c33fa4a4e4121842b1923fa4181b0534 Edited July 3, 2021 by EvilBird 1 1 Quote Link to comment Share on other sites More sharing options...
XCR1250 Posted July 4, 2021 Author Share Posted July 4, 2021 20 hours ago, EvilBird said: Try scream and fly . Com Usually some good tech guys there https://www.screamandfly.com/forumdisplay.php?20-Technical-Discussion&s=c33fa4a4e4121842b1923fa4181b0534 I already belong to that site, no one knew how to help, some had similar issues and all suggestions didn't solve it. Had the boat at 2 Merc dealers including 1 a couple days ago, $700 later and they said they don't know what's wrong. Quote Link to comment Share on other sites More sharing options...
oldslowsledder Posted July 4, 2021 Share Posted July 4, 2021 What's it doing? Quote Link to comment Share on other sites More sharing options...
CFM Posted July 4, 2021 Share Posted July 4, 2021 23 hours ago, EvilBird said: What HP motor? Offshoreonly has a lot of good tech info but just for the Big horsepower Merc outboards. I’m a 20yr active (mostly tech ) member there (don’t tell Polaris550 lolol) and I would say no on outboard tech there. I would think scream and fly because more outboards, but xcr1250 says no help for his ....hmmmm Quote Link to comment Share on other sites More sharing options...
Gold Member EvilBird Posted July 4, 2021 Gold Member Share Posted July 4, 2021 2 hours ago, XCR1250 said: I already belong to that site, no one knew how to help, some had similar issues and all suggestions didn't solve it. Had the boat at 2 Merc dealers including 1 a couple days ago, $700 later and they said they don't know what's wrong. That is so frustrating.....I use to work on Boats and sometimes you really get into a pickle where nobody knows what the hell to do. Quote Link to comment Share on other sites More sharing options...
Gold Member EvilBird Posted July 4, 2021 Gold Member Share Posted July 4, 2021 3 minutes ago, CFM said: I’m a 20yr active (mostly tech ) member there (don’t tell Polaris550 lolol) and I would say no on outboard tech there. I would think scream and fly because more outboards, but xcr1250 says no help for his ....hmmmm Yeah I agree ....even stern drive stuff its tough to get help nowadays..not like it once was but thats all forums seems like. Ive probably read some of your posts then if you been there 20 years lol 🍻🇺🇲 Quote Link to comment Share on other sites More sharing options...
XCR1250 Posted July 4, 2021 Author Share Posted July 4, 2021 (edited) 9 hours ago, oldslowsledder said: What's it doing? Multiple issues for years, here's several, about 80% of the time it will bog when trying to take off, after perhaps 3-4 times it may finally plane off, another is low RPM's, should hit 5,600-5,700 and has done that sometimes, 3 days ago after I did a lot of work to it it started to come around, a few time it would rev up to over 6,000, then later on it wouldn't go over 4,100. Yesterday it would do 4,100 then after a couple hours of trying it would sometimes hit close to 5,000, then back to a hotshot bog and 4-4,100 rpms. When running well it will hit 71-72 MPH on GPS, otherwise 40-55 MPH when not running well. Things I have done, new computer, both new TPS sensors, external coils, all 12 injectors, new MAP sensor, fuel filter (twice), hose from compressor high pressure output to Starboard side rail (was leaking air), new spark plugs twice..fixed a small oil pump leak from a bad o- ring, new diaphragms for the tracker valve, fuel, and air..$4,000 later still issues. Checked compression and did a leak down test, all was within specs. Edited July 4, 2021 by XCR1250 Quote Link to comment Share on other sites More sharing options...
Gold Member 800renegaderider Posted July 4, 2021 Gold Member Share Posted July 4, 2021 (edited) 12 minutes ago, XCR1250 said: Multiple issues for years, here's several, about 80% of the time it will bog when trying to take off, after perhaps 3-4 times it may finally plane off, another is low RPM's, should hit 5,600-5,700 and has done that sometimes, 3 days ago after I did a lot of work to it it started to come around, a few time it would just up to over 6,000, then later on it wouldn't go over 4,100. Yesterday it would do 4,100 then after a couple hours of trying it would sometimes hit close to 5,000, then back to a hotshot bog and 4-4,100 rpms. When running well it will hit 71-72 MPH on GPS, otherwise 40-55 MPH when not running well. Things I have done, new computer, both new TPS sensors, external coils, all 12 injectors, new MAP sensor, fuel filter (twice), hose from compressor high pressure output to Starboard side rail (was leaking air), new spark plugs twice..fixed a small oil pump leak from a bad o- ring, new diaphragms for the tracker valve, fuel, and air..$4,000 later still issues. Checked compression and did a leak down test, all was within specs. What’s it getting for fuel pressure? it sounds like a bad fuel pump. Edited July 4, 2021 by 800renegaderider Quote Link to comment Share on other sites More sharing options...
oldslowsledder Posted July 4, 2021 Share Posted July 4, 2021 21 minutes ago, 800renegaderider said: What’s it getting for fuel pressure? it sounds like a bad fuel pump. Yep, I'd strap a fuel pressure gauge on it and go for a drive, see if it acts up 1 Quote Link to comment Share on other sites More sharing options...
Gold Member 800renegaderider Posted July 4, 2021 Gold Member Share Posted July 4, 2021 17 minutes ago, oldslowsledder said: Yep, I'd strap a fuel pressure gauge on it and go for a drive, see if it acts up Yup. I’d think the plugs would have shown it running lean also. My money be on a failing pump. Quote Link to comment Share on other sites More sharing options...
Mark32786 Posted July 4, 2021 Share Posted July 4, 2021 (edited) Have you checked volts when it’s going good vs bad? I’ve also come across two merc motors ( one four, one opti) that had a harness problem that showed itself only with trim in the all the way down position. Wire was pulling itself away at the split causing the issue on both in that position the four stroke had a miss the computer wouldn’t pick up occasionally though. the opti was a low rpm at max throttle. Edited July 4, 2021 by Mark32786 Quote Link to comment Share on other sites More sharing options...
CFM Posted July 4, 2021 Share Posted July 4, 2021 9 hours ago, EvilBird said: Yeah I agree ....even stern drive stuff its tough to get help nowadays..not like it once was but thats all forums seems like. Ive probably read some of your posts then if you been there 20 years lol 🍻🇺🇲 Pm’d you. Yes, i would bet you have. Quote Link to comment Share on other sites More sharing options...
CFM Posted July 4, 2021 Share Posted July 4, 2021 (edited) Not to say it’s your problem , but for diagnosing . To quote myself, You don’t know anything about your efi engine if you don’t know it’s fuel psi. Key on, engine off. Key on, engine on. Under way with full thfottke and top rpm. Edited July 4, 2021 by CFM Quote Link to comment Share on other sites More sharing options...
XCR1250 Posted July 5, 2021 Author Share Posted July 5, 2021 1 hour ago, 800renegaderider said: What’s it getting for fuel pressure? it sounds like a bad fuel pump. All 3 pumps are new a few days ago. Quote Link to comment Share on other sites More sharing options...
XCR1250 Posted July 5, 2021 Author Share Posted July 5, 2021 Forgot that in my "what I've done", fuel pressure is good, checked by myself and 2 Merc techs at 2 dealers. 1 Quote Link to comment Share on other sites More sharing options...
Gold Member 800renegaderider Posted July 5, 2021 Gold Member Share Posted July 5, 2021 1 minute ago, XCR1250 said: Forgot that in my "what I've done", fuel pressure is good, checked by myself and 2 Merc techs at 2 dealers. 👌 well that rules out that. Hmm Quote Link to comment Share on other sites More sharing options...
CFM Posted July 5, 2021 Share Posted July 5, 2021 15 minutes ago, XCR1250 said: All 3 pumps are new a few days ago. So is the pressure correct now ? Quote Link to comment Share on other sites More sharing options...
XCR1250 Posted July 5, 2021 Author Share Posted July 5, 2021 1 minute ago, CFM said: So is the pressure correct now ? It was correct with both sets of pumps, old and new, I simply replaced them as part of trying to figure out what was wrong, this is the engine I had on the boat I sold F7-Ben, I kept the engine however, it's run the same on both boats, frustration to say the least. Quote Link to comment Share on other sites More sharing options...
oldslowsledder Posted July 5, 2021 Share Posted July 5, 2021 11 hours ago, XCR1250 said: It was correct with both sets of pumps, old and new, I simply replaced them as part of trying to figure out what was wrong, this is the engine I had on the boat I sold F7-Ben, I kept the engine however, it's run the same on both boats, frustration to say the least. Did you have the fuel pressure gauge on it when it acted up? 1 Quote Link to comment Share on other sites More sharing options...
XCR1250 Posted July 5, 2021 Author Share Posted July 5, 2021 36 minutes ago, oldslowsledder said: Did you have the fuel pressure gauge on it when it acted up? Did not when on the Lake, the 2nd. dealer Tech did however. Quote Link to comment Share on other sites More sharing options...
oldslowsledder Posted July 5, 2021 Share Posted July 5, 2021 10 hours ago, XCR1250 said: Did not when on the Lake, the 2nd. dealer Tech did however. Was the dealer able to get the boat to act up? With CDS hooked up they could have got a 'snapshot' of data when it happened, between that and a fuel pressure gauge it should hopefully give you a push in the right direction. Quote Link to comment Share on other sites More sharing options...
XCR1250 Posted July 5, 2021 Author Share Posted July 5, 2021 (edited) 1 hour ago, oldslowsledder said: Was the dealer able to get the boat to act up? With CDS hooked up they could have got a 'snapshot' of data when it happened, between that and a fuel pressure gauge it should hopefully give you a push in the right direction. Yes it acted the same for them as for me. Both Techs had a Mercury analyzer on it, I was with the first Tech for 2-1/2 hours, he couldn't figure it out. What both dealers techs told me was because of the year of the engine (1998) the analyzer does not measure check everything until a couple years later, last Tech said the black air injectors are known to be an issue so I installed the blue air injectors, didn't help. Engine was a traded in US Coast Guard engine that only had 98.2 hours on it when I bought it, it has about 140 now. Edited July 6, 2021 by XCR1250 Quote Link to comment Share on other sites More sharing options...
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