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Dan, Technician
Category: Buick
Satisfied Customers: 24458
Experience:  Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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I have a misfire code 300 and the car is sputtering with low

Customer Question

I have a misfire code 300 and the car is sputtering with low fuel pressure and unsteady rpm...I have changed the fuel pressure regulator and the sputtering started after I put on a new catalytic converter. Could the fuel injection be the culprit outside
the fuel pump?
Submitted: 2 years ago.
Category: Buick
Expert:  Dan replied 2 years ago.

Hello, my name is***** is the fuel pressure reading your getting?

Customer: replied 2 years ago.
It's like 30 to 40
Expert:  Dan replied 2 years ago.

The fuel injection could not cause low pressure, the only other thing would be wiring/connection problem. I'd monitor power/ground at fuel pump, if pump maintains steady voltage and ground then replace the pump. Let me know how it goes or if you have more questions. Thanks.

Customer: replied 2 years ago.
Expert:  Dan replied 2 years ago.

No problem, let me know how it turns out. Thanks again and have a great day!