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How to Adjust a Quadrajet

Back when it was introduced in the early 1960s, the Quadrajet was hailed as fuel delivery technology. The design was meant to help with maximum fuel economy as well as low exhaust emissions. Many mechanics of the time were unfamiliar how to work on it and designated it a "junk" carburetor. However, modern day mechanics realize that they are fairly easy to tune up, and with slight adjustments, they can have your car running at its best.

Instructions

1

Gather your tools and safety gear along with your Quadrajet manual. It is a good idea to run through and familiarize yourself with the diagrams and instructions in it.

2

Look for the adjustment screws. They are often found on the Quadrajets barrel side. You want to turn the screws hard enough to bottom them out. When they reach all the way down, screw them back in two complete turns.

3

Crank the car and let the engine idle. Give it time to warm the motor up.

4

Locate the carburetors vacuum hose and disconnect it. Then take the tachometer and hook it to the vacuum port. If it does not hold to the vacuum port, you may need to replace it since it can cause the vehicle to flood or run rich.

5

Begin adjusting the screws one by one. Continue this until the tachometer reaches the highest rating. After the meter peaks, repeat the adjustments.

6

Complete the adjustments by setting the idle to 1,000 RPMs with the car in park.

Posted by Unknown at 5:58 AM

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