1967 Bronco 170 inline six with autolite carb manual choke
Last weekend I rebuilt my carburetor as I have had issues with a jerking, power failure, and back fire after the bronco is driven and warmed up. That said after the install I drive it and it seemed fine but I then had the same issue. So I am thinking it’s one of two issues and would be interested in anyone’s experience.
1. When I rebuilt the carb I thoroughly cleaned it and over all it was surprisingly in good shape. The one issue I couldn’t solve is I noticed the power valve sometimes sticks. So I cleaned it the best I could as the kit directions said don’t replace. When it’s perfectly centered it bounces up and down as it should. If you look at the photo below you can see it trends to move tub the side and stick so I centered out before reinstalling. That said if I pushed it all the way down it also sticks even when centered. It seemed to get stuck on the metal area where the bend slot opening is. So I am wondering if this is my issue that puts sticking? If it is sticking would it cause the shaking and power failure I mentioned? If this odd the issue I watched on mikes carb how to remove the plug and clean it properly which I can do once I find a plug lol
2. If the carb isn’t the issue do you think my problem is the fuel pump? If so can I replace it with a non vacuum pump or do I need the stock vacuum model. That said I do not have a vaccum wiper washer as I replaced it with an electric? The cost difference between the two pumps is almost double.
This is the vacuum version:
This is a cheaper electric one and can I use this as a replacement and if so how do I modify to make it work?
As background beside the above in my effort to solve my issue I already did the following;
1. Changed the plugs and the spark wires are pretty new
2. Replaced the ignition coil
3. Replaced the condenser and the points looked clean so I left that alone
4. Inspected the distributor and it looked clean
5. Replaced the main fuel line as I found a kink
6. The fuel tank was brand new a year ago and that looks great.
7. Did an over all inspection of the vacuums and everything looks fine but I don’t have a gauge so didn’t formally confirm each one
One
8. The bronco starts up easily, idles and drives perfect for a 15 minutes to an hour and then it slowly starts to jerk, hesitate, jerks more, loses power and then I cost to the side and it restarts immediately and then I can drive again. It never completely dies it line it gets it’s breath back and is normal. Then it will act up again.
9. All the ground areas seem to be fine but I don’t know all of them to be certain.
Its maddening and I would be really interested in anyone’s thoughts and help.
Last weekend I rebuilt my carburetor as I have had issues with a jerking, power failure, and back fire after the bronco is driven and warmed up. That said after the install I drive it and it seemed fine but I then had the same issue. So I am thinking it’s one of two issues and would be interested in anyone’s experience.
1. When I rebuilt the carb I thoroughly cleaned it and over all it was surprisingly in good shape. The one issue I couldn’t solve is I noticed the power valve sometimes sticks. So I cleaned it the best I could as the kit directions said don’t replace. When it’s perfectly centered it bounces up and down as it should. If you look at the photo below you can see it trends to move tub the side and stick so I centered out before reinstalling. That said if I pushed it all the way down it also sticks even when centered. It seemed to get stuck on the metal area where the bend slot opening is. So I am wondering if this is my issue that puts sticking? If it is sticking would it cause the shaking and power failure I mentioned? If this odd the issue I watched on mikes carb how to remove the plug and clean it properly which I can do once I find a plug lol
2. If the carb isn’t the issue do you think my problem is the fuel pump? If so can I replace it with a non vacuum pump or do I need the stock vacuum model. That said I do not have a vaccum wiper washer as I replaced it with an electric? The cost difference between the two pumps is almost double.
This is the vacuum version:
This is a cheaper electric one and can I use this as a replacement and if so how do I modify to make it work?
As background beside the above in my effort to solve my issue I already did the following;
1. Changed the plugs and the spark wires are pretty new
2. Replaced the ignition coil
3. Replaced the condenser and the points looked clean so I left that alone
4. Inspected the distributor and it looked clean
5. Replaced the main fuel line as I found a kink
6. The fuel tank was brand new a year ago and that looks great.
7. Did an over all inspection of the vacuums and everything looks fine but I don’t have a gauge so didn’t formally confirm each one
One
8. The bronco starts up easily, idles and drives perfect for a 15 minutes to an hour and then it slowly starts to jerk, hesitate, jerks more, loses power and then I cost to the side and it restarts immediately and then I can drive again. It never completely dies it line it gets it’s breath back and is normal. Then it will act up again.
9. All the ground areas seem to be fine but I don’t know all of them to be certain.
Its maddening and I would be really interested in anyone’s thoughts and help.
