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What can cause gas mileage to decline after installing a rebuilt carburetor that was rebuit by a carburetor shop?
Wiki User
∙ 14y ago
Your question is a little vague, but here are a couple of ideas for you. The carburetor float is adjusted incorrectly. The carburetor was modified, or replaced with a modified part that doesn't meet the original carburetor specs. A test you can perform to determine if it is the carburetor causing the problem would be to drive the car for 5 miles, then stop and remove one of the spark plugs. It should be a clean leaning to a gray color. Any black sooty stuff on the plug means too much fuel coming from the carburetor.
You also need to make sure you did your part correctly. Are all of the vacuum lines connected and in the original positions? Spray some WD-40 around the carburetor while running to see if there is a vacuum leak. The engine will change rpm if there is.
Adjust the idle mixture if you haven't already. The carb shop would have set it to manufactures specifications, but may need to be adjusted to your car.
Wiki User
∙ 14y ago
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uneven or non true surface of 1 or all surfaces, wich can cause a bad seal. or a carburetor that you have had rebuilt by 2 separate people but still it is still not working properly ( like my self )
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Horse power for a 1986 Chevy silverado 305 engine?
Freshly rebuilt with good carburetor at 5000 rpm, 200 horsepower maybe a little more
