goodforbrains
New member
Hi, so I have a 1988 ish Nissan ns90a. I have done a lot of work to this guy and am close to the finish line. I have taken it out a few times now and the engine won't rev past 3000 rpms. It idles great and runs very good all the way up to 3000 rpms. I am not getting any alarms so I'm not sure if she is going into limp mode or not. When I turn the key to start, I think that the horn is supposed to beep. I don't get any tone. So I took the oil sensor bullet apart and ground the end to the block and the horn activates. I reconnected that. I disconnected the water pressure switch and the overheat sensor at the electrical box. Dropped her in the water today and I get the same 3000 rpm max. I read somewhere that when the oil level sensor triggers, the engine doesn't go into limp. The oil light in the tach doesn't illuminate (I checked the bulb the other day). So I don't think it is the level sensor. I raised the motor to bottom hole... same results. Prop is 13.25x17. 17' Proline. Prop is in good condition. Brand new Atwood bulb and fuel tank is a portable that I use for my 9.8 four stroke with no issues. New factory fuel pump and gasket. New factory carb kits. Cleaned carbs 3 times. All new fuel lines. Original fuel connectors at engine. Compression is 135 in all 3 cyls. Brand new factory waterpump kit. I need some guidance on what my next steps should be. Thanks for reading and helping!
