Hi All! I have an 04 v6 auto that I picked up for $800. It was running on 4 or 5 cylinders and barely idled. When I tore into it, I found that the ignition coil had been replaced with one from a 99 and wired incorrectly (Cyl 3 & 4 were swapped). The harmonic balancer was also from a 99. I replaced the plugs, wires, ignition coil. Harmonic balancer with parts for an 04 3.9 (The VIN indicates it's a 3.9) and the engine smoothed out a lot but it's still kind of rough. I've also replaced the engine and transmission mounts with Ford parts. I know the car was in an accident 5-6 years ago from the carfax and the front fender and bumper were replaced and poorly redone but what I don't know is if they dropped an engine from a 99 or just took parts off of a 99 (I assume 99 because the plug wires were the style for a 99 and the harmonic balancer was for an externally balanced engine). The labels on the driver's side valve cover are either absent or torn and unreadable. Is there some way to check to see which engine this is? I don't want to ruin the engine by running the wrong harmonic balancer and I'd like to get the vibration under control. 1500 RPM will rattle your teeth!
Thanks!
Thanks!