DeathBySanity
Well-Known Member
- Messages
- 44
- Reaction score
- 3
- Points
- 57
- Boat Make
- Yamaha
- Year
- 2005
- Boat Model
- SX
- Boat Length
- 23
Soooo...*UPDATE* ... *Not* bad ecu (4/4/21 then on 5/21/21 confirmed the ECU was bad)?
I think I have a bad ECU (not any more, but reasons still valid). Reason being is 1. there is fuel in starboard engine. 2. The boat runs purrrrfect and then it doesn't. After 15-20 minutes of being under load, the boats RPMs go crazy. Good thing I bought this boat a 3 weeks ago and just mounted a tower with a sick bimini, an had her serviced to now buy a ECU rant over lol.
I am going to swap ecu's to see if the issue moves motors to confirm. Is there any way to confirm this with the YDS before, or is swapping them the best route?
Update***
YDS does not show any thrown codes.
4/4/21 - Swapped ECUs and issue did not move to port it remained in starboard engine assumption is ECU = Good
Took laptop with YDS cable out to diagnose and found out starboard an port have different connectors... and I guess I had the port connector, so no new data.
4/11/21 - I did disconnect the temp sensors from the boat to see if I had an over temp issue...Specifically, the starboard engine was at a solid 98 degrees (using a temp gun) before the issue kicked me in the groin again! When it did, I disconnected the temp sensors (green and blue connectors in the front an back of engine) to get rid of the nagging issue of a potential bad over temp cut off switch, and the issue laughed at me and said "that wasn't it peasant."
Being master a master boat technician as I have owned a boat for 10+ minutes and completed an oil change, I swapped out fuel pumps to eliminate insufficient fuel pressure as an issue. I know this does not address the fuel in oil issue, but I may be chasing two separate issues... Any logic to this?
4/18/21 - Okay update # lost track. I got the YDS hooked up and the issue never showed itself
... While stationary, I performed the injector test. It passed with flying colors on injectors 2-4, but I didn't hear any clicking on #1. This would explain the fuel smell in the oil, but still does not help with the intermittent issue. I plan to pull the throttle body finally and see if it is a computer issue, or if it is an injector issue (swapping injectors and performing the fuel pump pressurizing test & firing the injectors). Getting there, just not as fast as I would like.
@Beachbummer, I have all the tools in the boat to swap coil packs now. If I get the issue, I will YDS the boat to get the graph, and then I will swap the packs to see if it swaps sides.
5/1/21 - Had issue and captured YDS see link below for the CSV files. While on water swapped the coil packs from port to starboard. Boat ran pretty bad.
5/9/21 - Swapped ECU and noticed my bad one was modded/repaired. See pic in the post I made on 5/10/21. Going to test all injectors and spark out the coil packs.
5/21/21- Hooked up spark tester on both starboard and port engines; all 8 cylinders good to go. Pulled fuel rail on starboard engine to ohm out the injectors. All injectors tested out at 12.3 -12.5 on starboard. But while I was digging the injectors out, I found one heck of a surprise! See pic below.
Yes, that is some crazy engineering, wiring injector 1 to injector 2. So while I had an ECU issue with injector one, someone thought it was a good idea to wire them together so they both fire at the same time (possibly to overcome an injector .
So I clipped the wire, installed the injectors and the fuel rail. They all seemed to fire, since the bad ECU was moved to port (comparing to the test performed on 4/18/21). At this point I was relieved and stressed about the wiring so I only did the YDS injector test on port side. Injectors 2 and 4 would fire, 1 and 3 would not. This confirmed the ECU being bad since I just swapped them. Finally, I confirmed I had a bad ECU. I then ordered a new ECU.
5/28/21 - Took off port side fuel rail, tested all injectors. Injector 2 ohm'd out at 18 so I replaced it. I also replaced the ECU. So everything fired up appropriately and seemed to run just great. Then a few hours later when I tried to start the starboard engine, it did not want to start. after 5 min of trying to crank it, bam... it worked like nothing ever happened. I think I am fighting a new issue now. Any ideas?
Jonathan
Video of RPMs flaking out - https://drive.google.com/file/d/1NnRDYexW5tO9MuVpY74sJL4ci36k99af/view?usp=sharing
CSV YDS files - YDIS Runs - Google Drive
I think I have a bad ECU (not any more, but reasons still valid). Reason being is 1. there is fuel in starboard engine. 2. The boat runs purrrrfect and then it doesn't. After 15-20 minutes of being under load, the boats RPMs go crazy. Good thing I bought this boat a 3 weeks ago and just mounted a tower with a sick bimini, an had her serviced to now buy a ECU rant over lol.
I am going to swap ecu's to see if the issue moves motors to confirm. Is there any way to confirm this with the YDS before, or is swapping them the best route?
Update***
YDS does not show any thrown codes.
4/4/21 - Swapped ECUs and issue did not move to port it remained in starboard engine assumption is ECU = Good
Took laptop with YDS cable out to diagnose and found out starboard an port have different connectors... and I guess I had the port connector, so no new data.
4/11/21 - I did disconnect the temp sensors from the boat to see if I had an over temp issue...Specifically, the starboard engine was at a solid 98 degrees (using a temp gun) before the issue kicked me in the groin again! When it did, I disconnected the temp sensors (green and blue connectors in the front an back of engine) to get rid of the nagging issue of a potential bad over temp cut off switch, and the issue laughed at me and said "that wasn't it peasant."
Being master a master boat technician as I have owned a boat for 10+ minutes and completed an oil change, I swapped out fuel pumps to eliminate insufficient fuel pressure as an issue. I know this does not address the fuel in oil issue, but I may be chasing two separate issues... Any logic to this?
4/18/21 - Okay update # lost track. I got the YDS hooked up and the issue never showed itself
... While stationary, I performed the injector test. It passed with flying colors on injectors 2-4, but I didn't hear any clicking on #1. This would explain the fuel smell in the oil, but still does not help with the intermittent issue. I plan to pull the throttle body finally and see if it is a computer issue, or if it is an injector issue (swapping injectors and performing the fuel pump pressurizing test & firing the injectors). Getting there, just not as fast as I would like.@Beachbummer, I have all the tools in the boat to swap coil packs now. If I get the issue, I will YDS the boat to get the graph, and then I will swap the packs to see if it swaps sides.
5/1/21 - Had issue and captured YDS see link below for the CSV files. While on water swapped the coil packs from port to starboard. Boat ran pretty bad.
5/9/21 - Swapped ECU and noticed my bad one was modded/repaired. See pic in the post I made on 5/10/21. Going to test all injectors and spark out the coil packs.
5/21/21- Hooked up spark tester on both starboard and port engines; all 8 cylinders good to go. Pulled fuel rail on starboard engine to ohm out the injectors. All injectors tested out at 12.3 -12.5 on starboard. But while I was digging the injectors out, I found one heck of a surprise! See pic below.
Yes, that is some crazy engineering, wiring injector 1 to injector 2. So while I had an ECU issue with injector one, someone thought it was a good idea to wire them together so they both fire at the same time (possibly to overcome an injector .
So I clipped the wire, installed the injectors and the fuel rail. They all seemed to fire, since the bad ECU was moved to port (comparing to the test performed on 4/18/21). At this point I was relieved and stressed about the wiring so I only did the YDS injector test on port side. Injectors 2 and 4 would fire, 1 and 3 would not. This confirmed the ECU being bad since I just swapped them. Finally, I confirmed I had a bad ECU. I then ordered a new ECU.
5/28/21 - Took off port side fuel rail, tested all injectors. Injector 2 ohm'd out at 18 so I replaced it. I also replaced the ECU. So everything fired up appropriately and seemed to run just great. Then a few hours later when I tried to start the starboard engine, it did not want to start. after 5 min of trying to crank it, bam... it worked like nothing ever happened. I think I am fighting a new issue now. Any ideas?
Jonathan
Video of RPMs flaking out - https://drive.google.com/file/d/1NnRDYexW5tO9MuVpY74sJL4ci36k99af/view?usp=sharing
CSV YDS files - YDIS Runs - Google Drive
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