Hey everyone, I just finished a rebuild of a 2100v with a 350 mag MPI. Had the block machined, new rings, new bearings, heads gone through, and new gaskets.... a completely new motor. After I finished rebuilding it, I took it on the water. It would plane out, lacked power, and would foul plugs very quickly. I took it to a local marina, and had them set the timing with their computer, and now I do not have enough power to get onto plane, and as soon as I give the boat any throttle, it backfires through the intake.
I replaced the plugs, rotor, distributor cap, fuel pressure regulator, wires, ignition module in the distributor. I am getting 35 (not sure the units of measure) when I hook up a vacuum gauge at idle, the Mercruiser service manual says it should be around 15. I am getting 62 psi fuel pressure at the schrader valve at idle, and today I checked it while running, and it was up around 80 at one point. I changed the fuel pressure regulator with a genuine part yesterday, and it did not solve my high fuel pressure. Lastly I have traced the plug wires 3 times to ensure I had the firing order correct.
I am at a complete loss here, ready to throw on a carburetor.... Any insight anyone can give me would be greatly appreciated!!!!!
I replaced the plugs, rotor, distributor cap, fuel pressure regulator, wires, ignition module in the distributor. I am getting 35 (not sure the units of measure) when I hook up a vacuum gauge at idle, the Mercruiser service manual says it should be around 15. I am getting 62 psi fuel pressure at the schrader valve at idle, and today I checked it while running, and it was up around 80 at one point. I changed the fuel pressure regulator with a genuine part yesterday, and it did not solve my high fuel pressure. Lastly I have traced the plug wires 3 times to ensure I had the firing order correct.
I am at a complete loss here, ready to throw on a carburetor.... Any insight anyone can give me would be greatly appreciated!!!!!
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