- Joined
- May 23, 2011
- Messages
- 187
- Reaction score
- 1
- Location
- Maryland
- My Car
- '73 Mach1, motorcycle, Ford Ranger
Looking for ideas - I have a 351C with an Edelbrock 750 cfm carb. It was running & idling fine a couple of weeks ago.
The car idles really rough, and it stalls out if you give it some gas; but if you hold the choke flapper partially closed (not all the way, but with just about a third of an inch slit open) it'll idle great, and it runs smoothly at higher rpm if you give it gas that way. I can even drive it like that, but it doesn't have a lot of power.
If I give it gas and get the rpms up, then open up the choke flapper all the way, it will run smoothly at 1500-2000 rpm. Have only done this in the driveway sitting still - not out on the road, as I don't have a manual choke hooked up.
I tried opening the idle adjustment screws further, but that didn't change anything.
Any ideas? I put the carb on about a year ago and have put about 600 miles on the car, maybe less. I try to drive it weekly - I do a 10 mile run or so.
Sometimes I get it dialed in and it seems to run and idle great; other times it idles low and runs like crap, and I can't figure out why or what to adjust. From what I've discovered about the choke flap, I'd guess that when it idles low & runs like crap, it's running lean - closing the choke would richen the mixture by cutting off air.
The car idles really rough, and it stalls out if you give it some gas; but if you hold the choke flapper partially closed (not all the way, but with just about a third of an inch slit open) it'll idle great, and it runs smoothly at higher rpm if you give it gas that way. I can even drive it like that, but it doesn't have a lot of power.
If I give it gas and get the rpms up, then open up the choke flapper all the way, it will run smoothly at 1500-2000 rpm. Have only done this in the driveway sitting still - not out on the road, as I don't have a manual choke hooked up.
I tried opening the idle adjustment screws further, but that didn't change anything.
Any ideas? I put the carb on about a year ago and have put about 600 miles on the car, maybe less. I try to drive it weekly - I do a 10 mile run or so.
Sometimes I get it dialed in and it seems to run and idle great; other times it idles low and runs like crap, and I can't figure out why or what to adjust. From what I've discovered about the choke flap, I'd guess that when it idles low & runs like crap, it's running lean - closing the choke would richen the mixture by cutting off air.