Have you made any logs? Watch the rpm the system is seeing, when that tach wire gets noise it will throw the rpm to 20,000 and flood the engine.Pitched just under 2. Can't tell what the plugs look like when it's happening because when it idles back down they get a correct color on them. I'm getting AFR readings spiking up to 20 on the handheld monitor. I was able to get it to run correctly once and ran it across 5 acres of horse pasture. I would post a pic how I was slinging the engine at time of build but I can't seem to get them to upload It feels like it's gagging on fuel because the injection thinks it's lean and the injectors are running wide open
I hope this finds you made progress on it brother, as we all know what the Peace River looked like this week.So I didn't have a problem until I bolted the gearbox on and reconfigured the rigging to fit. Damn thing thinks it's running lean and what I can only assume is it's flooding the engine with fuel trying to correct what information the O2 sensor is relaying. Now I removed the 2 barrel and installed a 4 barrel thinking that it was an issue of not enough CFMs. Couldn't barely get it to turn up over 4000. Same thing is happening with 4 barrels so it wasn't a CFM problem. Thought maybe it was a HP capability issue. 2 barrel is rated at 400. Motor makes 425 at 4850. Thought it was close enough initially. 4 barrel is rated for 600. I've increased volume to the pump. Removed the fuel pump power source from the injection unit internal fuel pump relay and hooked it up direct to battery using an external relay triggered by the internal relay. Still no joy. Changed O2 sensors to rule out faulty sensor. Nope not it. Now from my experience with these FiTech injection systems on vehicles they are super sensitive to outside issues, especially exhaust leaks. That said when I was fabricating the new rigging I was hanging the engine and gearbox from the headers with nylon slings. Could I have damaged the header gaskets allowing it to suck fresh air at the head sealing at higher rpms and feeding the O2 sensor with false readings? This is my next step. I have some dead soft aluminum header gaskets to replace the original felpro standard exhaust gaskets. I took it out Labor day and the damn boat wouldn't get out of it's own way! 2 miles and turned around, thought I was gonna sink it a couple of times. The following sea was coming over the transom and the blade was bailing water. I didn't have enough power to throttle up when it was happening. Talk about STRESSFUL. No shallow marsh around here test. Peace River is up right now. Until I figure this it's gonna stay on the trailer. Aggravating MFer!!!!!