Reads a P0300 multi Misfire and a P0230 Fuel Pump circuit failure. Where i should start?

Question

The personal OBDII reader didn't pick up the codes, went to Advanced Auto, and used their reader and that's what popped up on my 2004 Pontiac Grand Am 3.4L.

Comments

A falha de algum injetor pode baixar a pressão na linha de combustivel também o caso é desmontar e investigar os componentes ! Pressão de Bomba e Injetores "

The failure of an injector can lower the pressure in the fuel line, also the case is to disassemble and investigate the components! Pump and Injector Pressure"

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Thank you for the advice. Upon further inspection, found a plug wire had burnt through and was arcing against the motor. After changing plugs and wires, the issue no longer exist.

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Thank you for sharing! I'm glad you found the problem.

Answer 1

Any other symptoms? At some point the fuel pump may have stopped working, causing the engine to misfire. I recommend checking or replacing the fuel pump relay. If the problem persists, replace the fuel pump.

P0300 Pontiac Code - Engine Misfire Detected
Read more: https://www.autocodes.com/p0300_pontiac.html

P0230 Pontiac Code - Fuel Pump Relay Control Circuit
Read more: https://www.autocodes.com/p0230_pontiac.html