So I just had my motor built, 60% overs, rods, mahl cut and coated pistons, valve springs, keyed everything, welded water pump, studs, girdled, ats dual fuelers, gt3788r with s472 twins, dts intercooler and tuned by kory. I had injector issues to start off with but I believe I got those handled. Balance rates at 30mpa are below 1.
Problem is I have a miss. Not present at idle or at least not detectable thru balance rates and sound of the engine running. There's no pre det so it doesn't seem like an over fueling problem. It gets more pronounced under load and it is all the way thru the rpm range. We did compression tests and those came out fine. We added another ground to the block just in case it was a grounding problem since I relocated the batteries to the frame rail. The only codes it's showing is a low voltage code for the oil pressure sensor and high pressure ac sensor (p00522, p00530). It is present on every tune and doesn't seem to change with any of them. We checked the injector harnesses before we assembled and hooked a volt meter up to check from the ficm plug to the injectors and from the ficm to the ECM. No shorts detected. I towed with it this weekend and going up a steep grade with a 6k pound boat just maintaining speed, it made an almost machine gun like sound at around 2000 rpm. Didn't sound like a fuel knock, more like a starter without enough amperage to turn over and a little quieter. It did the same thing before I had the motor built. The only parts that weren't replaced was the wiring harnesses, the glow plug controller, and the ficm. New crank speed and cam shaft sensors. All the other sensors are off my old engine.
My mechanic is scratching his head at this point and my wallet is begging for mercy. Any ideas on what else to check or what else could be wrong would be greatly appreciated.
Problem is I have a miss. Not present at idle or at least not detectable thru balance rates and sound of the engine running. There's no pre det so it doesn't seem like an over fueling problem. It gets more pronounced under load and it is all the way thru the rpm range. We did compression tests and those came out fine. We added another ground to the block just in case it was a grounding problem since I relocated the batteries to the frame rail. The only codes it's showing is a low voltage code for the oil pressure sensor and high pressure ac sensor (p00522, p00530). It is present on every tune and doesn't seem to change with any of them. We checked the injector harnesses before we assembled and hooked a volt meter up to check from the ficm plug to the injectors and from the ficm to the ECM. No shorts detected. I towed with it this weekend and going up a steep grade with a 6k pound boat just maintaining speed, it made an almost machine gun like sound at around 2000 rpm. Didn't sound like a fuel knock, more like a starter without enough amperage to turn over and a little quieter. It did the same thing before I had the motor built. The only parts that weren't replaced was the wiring harnesses, the glow plug controller, and the ficm. New crank speed and cam shaft sensors. All the other sensors are off my old engine.
My mechanic is scratching his head at this point and my wallet is begging for mercy. Any ideas on what else to check or what else could be wrong would be greatly appreciated.
so now I have to replace that before I can start it again and take a video of the miss fire that's really the biggest issue I need to fix.
