Hi Gents,
I'll post up a proper log on my machine, but I need some help on the quick.
My 1975 Ranchero has had a transplanted 460 in it (probably an mid 70's lincoln motor). Whats happening is that it is dying after running around my neighborhood for roughly 20 minutes. First, I thought it was the Duraspark ignition, so I've replaced that with a 6AL box + Blaster 2 coil. This didn't remedy the situation. I also checked my timing and it's about 14° initial. I did notice it will move around a fair bit once set (every couple seconds it drops a couple of points...). Is this normal? Next, I thought maybe I was loosing fuel pressure, so I added a inline gauge and removed a filter that was mounted right before the pump. Then we figured it was running really hot and not properly circulating, so we changed the t-stat to a 180° one and checked for proper pump operation. This helped drop the underhood temps down a fair bit.
Now, when it's idling in the driveway, it's fine for 30-40 minutes, but underload, it will die after about 20 minutes of driving. I've checked the spark which is very fine, but it seems like the fuel pressure drops to 2.5 psi. After cooling off, it will jump back up to 7-8 psi and fire up. I have a feeling that this is fuel pump/carb related, but I'm not really sure. Thought about it being vapor lock, but since this is my first large V8/carb'd car I've had, I'm learning as I go.
This all started one day after driving out for a load of flooring in the city... but the day before I drove out to work, as well as to see a friend with no problems.
I know it's a novel, but I'm just trying to cover all that I did...
Thoughts? Advice? Any help is appreciated.
I'll post up a proper log on my machine, but I need some help on the quick.
My 1975 Ranchero has had a transplanted 460 in it (probably an mid 70's lincoln motor). Whats happening is that it is dying after running around my neighborhood for roughly 20 minutes. First, I thought it was the Duraspark ignition, so I've replaced that with a 6AL box + Blaster 2 coil. This didn't remedy the situation. I also checked my timing and it's about 14° initial. I did notice it will move around a fair bit once set (every couple seconds it drops a couple of points...). Is this normal? Next, I thought maybe I was loosing fuel pressure, so I added a inline gauge and removed a filter that was mounted right before the pump. Then we figured it was running really hot and not properly circulating, so we changed the t-stat to a 180° one and checked for proper pump operation. This helped drop the underhood temps down a fair bit.
Now, when it's idling in the driveway, it's fine for 30-40 minutes, but underload, it will die after about 20 minutes of driving. I've checked the spark which is very fine, but it seems like the fuel pressure drops to 2.5 psi. After cooling off, it will jump back up to 7-8 psi and fire up. I have a feeling that this is fuel pump/carb related, but I'm not really sure. Thought about it being vapor lock, but since this is my first large V8/carb'd car I've had, I'm learning as I go.
This all started one day after driving out for a load of flooring in the city... but the day before I drove out to work, as well as to see a friend with no problems.
I know it's a novel, but I'm just trying to cover all that I did...
Thoughts? Advice? Any help is appreciated.