silver_streak
New member
"I have a '01 Chevy vortec
"I have a '01 Chevy vortec 4.3 engine that is carburated( with 102 hrs) that is in my '01 Jetcraft that has a American Turbine jet pump (SD209). The problem that I'm having is under load/accelerating, the engine misses/stumbles at 3200 rpms. I cannot even get the boat on plane. It doesn't matter if the engine is warmed up or not. After pulling the plugs, I noticed black soot on them. Compression test was normal, and leakdown test was also normal. Here is a list of other things that I've checked out or replaced:fuel/water sep-new, gas tank drained, put in fresh fuel with a run of Sea Foam stabilizer/cleaner, checked for air leaks in fuel lines, new anti siphon valve, changed cap and rotor, plugs and wires, new coil and ignition module(EST), checked timing-was to specs, new fuel pump, and out of desperation put a new Edelbrock carb on it(1409)-this replaced the Holley 4160.After pulling the carb, I also noticed black soot on the bottom side/intake side of the primary throttle plate. The only thing in the ignition that I didn't change was the pick-up coil. I've been trying to figure this problem out for a few months. You can tell that I'm desperate to find the problem and correct it. Help! Any advice or pointers would be appreciated"
"I have a '01 Chevy vortec 4.3 engine that is carburated( with 102 hrs) that is in my '01 Jetcraft that has a American Turbine jet pump (SD209). The problem that I'm having is under load/accelerating, the engine misses/stumbles at 3200 rpms. I cannot even get the boat on plane. It doesn't matter if the engine is warmed up or not. After pulling the plugs, I noticed black soot on them. Compression test was normal, and leakdown test was also normal. Here is a list of other things that I've checked out or replaced:fuel/water sep-new, gas tank drained, put in fresh fuel with a run of Sea Foam stabilizer/cleaner, checked for air leaks in fuel lines, new anti siphon valve, changed cap and rotor, plugs and wires, new coil and ignition module(EST), checked timing-was to specs, new fuel pump, and out of desperation put a new Edelbrock carb on it(1409)-this replaced the Holley 4160.After pulling the carb, I also noticed black soot on the bottom side/intake side of the primary throttle plate. The only thing in the ignition that I didn't change was the pick-up coil. I've been trying to figure this problem out for a few months. You can tell that I'm desperate to find the problem and correct it. Help! Any advice or pointers would be appreciated"