In the final part of our four part series on carburetor upgrades we install the vacuum lines, attach the throttle linkage, hook up the electric choke and make the final adjustments. Also, this is a good time to replace the any old vacuum lines with new ones.
Main Points – How To Install The New Carburetor
- Replace any vacuum lines that are old, cracked or dry rotted. Be sure to connect the vacuum lines to the correct ports. The guide that came with the new carburetor should show which ports is timed and which port is for the manifold. Some engines use ported or timed vacuum while others use manifold vacuum. Most cars with an automatic transmission use manifold vacuum. Be sure to plug vacuum ports that will not be used.
- Install the throttle linkage and a new return spring. This will help ensure that the throttle linkage performs well. After the linkage is installed test it by moving the linkage backwards and forward several times. Make sure it can travel its full length without binding or getting stuck. It should move smoothly through its entire range.
- Connect power to the electric choke. Ground the black wire to the electric choke housing. The red wire, or positive wire, should be routed to the fuse box. Use one of the terminal marked accessory or keyed accessory. Do not attach the positive wire directly to the coil or the alternator. That will cause problems in the long run.
- Now the installation is complete. The next step is priming the carburetor. Crank the engine for ten or fifteen seconds to prime the carburetor. If the engine starts, turn it off.
- Find a friend and have him or her start the engine and rev the engine a few times while you observe the carburetor. You are looking for fuel leaks or vacuum leaks. Fix any you find.
- Run the engine for a few minutes to bring the engine up to standard operating temperature.
- The next step is to adjust the air fuel mixture. The goal is to get a good smooth idle. This can be done by ear in most cases. The screws that control the air fuel mixture are located on the carburetor. Remember, they only control the air fuel mixture at idle RPMs. These adjustments do not affect the air fuel mixture during normal or even performance driving.
- There is another idle adjustment on the throttle linkage. Again this can be done by ear. The goal is to get a good smooth idle. If your car has a tachometer, you also use it to do a more precise adjustment.
- Finally, reinstall the air cleaner.
Congratulations! You have successfully installed a carburetor and are now an official shade tree mechanic.
For advance carburetor tuning tricks check out this video. It explains how to replace the jets and the metering rods. The standard set up from the factory meets most requirements for most cars. These adjustments are for those trying to squeeze every ounce of performance out of their muscle car.
Finally this video explains some advanced troubleshooting for those that are having problems. Major issues explained include idle speed problems and how to find vacuum leaks. Remember most problems are caused by dirt in the carburetor or a vacuum leak. Check those out first.
The rest of the “How To Replace A Carburetor Series” is below:
- Part One – Carburetor Upgrades, Introduction To The Carburetor
- Part Two – Carburetor Upgrades, Removal Of The Old Carburetor
- Part Three – Carburetor Upgrades, Installing The New Carburetor (First Half)
- Part Four – Carburetor Upgrades, Installing The New Carburetor (This Article)
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Edelbrock Performer Carburetor On Amazonor
Edelbrock Performer Series Carburetors On ebay