Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
1977 Qjet coughs and sputters
stushug:
I have a 1977 Grand Prix. I just had the engine rebuilt (stock specs). The carb was leaking from a lot of different places so I had it rebuilt also. Now, if I go past 1/4 of the way with the gas pedal, the engine coughs and sputters, while barely accelerating. I checked ignition, compression, wires and plugs and everything is fine. As long as I don't go past about 1/4 throttle, the car accelerates fine. It also idles perfectly. Looking for some help on this, any suggestions would be greatly appreciated.
Frank400:
Looks like it's running out of fuel. I once had the same problem when I forgot to install the spring under the apt screw and the primary rods were going own all the way, almost blocking the jets.
What is your carb number and with what kind of parts was it rebuilt ?
stushug:
Frank,
Top row of numbers: 17057274 Second row: 1517 ARN. The carb was rebuilt by Dennis Barker, so I assume the quality of parts were good. I'm thinking it may be getting too much fuel, I can always smell it, and the mileage is down to about 6mpg. The car used to get about 10-12 city and about 15-17 highway. I pulled a plug today and it's pretty loaded with carbon. I'm attaching a picture. Thanks for the help!
Frank400:
Very good unit, and that is most likely the original from your car, 1517 is the date code, 151st day of 77. Did you ask Mr. Barker about your issues ?
stushug:
Yes, I've spoken with him over the phone, but it's very difficult to work that way. He's located in Colorado and I live in Pittsburgh, PA.
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