As I said, I'm in over my head.
Here goes. My car (66 GT, 289 4V) has a surge that is especially present at around 55 MPH. This is annoying, so I thought I'd try to fix it. I follow Pony Carbs suggestions and rotate the distributor until the car idles the fastest. I turn it until it can't go any further due to the thermostat housing. Still surges.
About the same time, my present carb started acting up. No problem. I have an extra 4V that was rebuilt by Pony Carb a few years back. I pull the problem carb--gunked up--and put on the new one. I can't believe what a difference it makes. As for that, I'm feeling good about myself.
Anyway, the surging gets worse. I replace the distrib cap--mine was a bit worn--and the plugs as my previous carb was running a bit rich. No difference.
I remember reading that surging can be caused by a overly lean carb setting. I richen the carb settings a bit (1/2 turn in small incriments) and no luck.
So, I give in, get a timing light, a get a pal to teach me to use it. We have the car set at about 6.5-7 degrees, but still surges.
Ok, here's the questions.
A) What is your car timed at? What is too much timing?
B) What in the devil can cause this surging? I'm pulling my hair out in big chunks, and I don't have much to spare!
I realize that I went about this in a goofy way, but timing and carbs is not my strong point. (Yeah, I know. That's obvious!)
Any and all ideas appreciated!
Thanks for reading.
--P
Here goes. My car (66 GT, 289 4V) has a surge that is especially present at around 55 MPH. This is annoying, so I thought I'd try to fix it. I follow Pony Carbs suggestions and rotate the distributor until the car idles the fastest. I turn it until it can't go any further due to the thermostat housing. Still surges.
About the same time, my present carb started acting up. No problem. I have an extra 4V that was rebuilt by Pony Carb a few years back. I pull the problem carb--gunked up--and put on the new one. I can't believe what a difference it makes. As for that, I'm feeling good about myself.
Anyway, the surging gets worse. I replace the distrib cap--mine was a bit worn--and the plugs as my previous carb was running a bit rich. No difference.
I remember reading that surging can be caused by a overly lean carb setting. I richen the carb settings a bit (1/2 turn in small incriments) and no luck.
So, I give in, get a timing light, a get a pal to teach me to use it. We have the car set at about 6.5-7 degrees, but still surges.
Ok, here's the questions.
A) What is your car timed at? What is too much timing?
B) What in the devil can cause this surging? I'm pulling my hair out in big chunks, and I don't have much to spare!
I realize that I went about this in a goofy way, but timing and carbs is not my strong point. (Yeah, I know. That's obvious!)
Any and all ideas appreciated!
Thanks for reading.
--P