I'll apologize in advance for the length of this post but I could really, really use some help with my carburetor.
I removed my stock instake and 2100 carburetor in July. I installed a new Weiand Stealth intake and Holley 570 Street Avenger carburetor from Summit. I expected the parts to work well out of the box but it has not turned out that way. From the start, I have had two problems I've not been able to fix.
Problem 1) I have a hesitation under moderate to heavy acceleration. It is brief and then the car takes off. I've checked for vacuum leaks, increased timing, changed accerator cams, changed pump nozzles, and several other things people have suggested. None of these have corrected the problem and I'm at a loss on how to fix it. I've stopped short of changing the jets which is the last suggestion I was given.
Problem 2) The Holley video which came with the carb states you should turn the idle mixture screws two turns out and then connect a vaccum gauge. You should adjust them equally until the vaccum is at the highest measurement. I've tried this but adjusting the screws made no difference in vaccum. I've just set them at 2 turns out and have left it but it seems this is not great and might contribute to the first problem.
As I stated, the most recent suggestion was to change to larger jets. Before doing this, I thought of buying an air/fuel gauge. Once I learned of the cost, I decided against it as I've already dumped too much into trying to get this carburetor to work. Instead, I thought I would pull the plugs to look at them.
Before changing the carburetor, I took pictures of the plugs and they were all the same and looked good. When I pulled them out last night, they are all a little darker. Plug 1, 4, and 7 are covered in a dark black powder. These are fed by the same side of the carb so I wonder if this is a sign the idle mixture screws should not be set the same on each side.
Any advice you can give would be greatly appreciated in fixing this problem? Any chance the carburetor is bad and should be returned?
I removed my stock instake and 2100 carburetor in July. I installed a new Weiand Stealth intake and Holley 570 Street Avenger carburetor from Summit. I expected the parts to work well out of the box but it has not turned out that way. From the start, I have had two problems I've not been able to fix.
Problem 1) I have a hesitation under moderate to heavy acceleration. It is brief and then the car takes off. I've checked for vacuum leaks, increased timing, changed accerator cams, changed pump nozzles, and several other things people have suggested. None of these have corrected the problem and I'm at a loss on how to fix it. I've stopped short of changing the jets which is the last suggestion I was given.
Problem 2) The Holley video which came with the carb states you should turn the idle mixture screws two turns out and then connect a vaccum gauge. You should adjust them equally until the vaccum is at the highest measurement. I've tried this but adjusting the screws made no difference in vaccum. I've just set them at 2 turns out and have left it but it seems this is not great and might contribute to the first problem.
As I stated, the most recent suggestion was to change to larger jets. Before doing this, I thought of buying an air/fuel gauge. Once I learned of the cost, I decided against it as I've already dumped too much into trying to get this carburetor to work. Instead, I thought I would pull the plugs to look at them.
Before changing the carburetor, I took pictures of the plugs and they were all the same and looked good. When I pulled them out last night, they are all a little darker. Plug 1, 4, and 7 are covered in a dark black powder. These are fed by the same side of the carb so I wonder if this is a sign the idle mixture screws should not be set the same on each side.
Any advice you can give would be greatly appreciated in fixing this problem? Any chance the carburetor is bad and should be returned?
