Question about 2005 Chevrolet Impala

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I get a code po300 on a scanner wich says multiple cylinder missfire on a 2000 chevy impala 3.8 engine i have replaced the computer no help any suggestions would be greatly appreciated thanks

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Check and replace the plugs and see if the Spark plug wires need to be replaced too. Make sure the wires don't have any burn marks or arching on the exhaust manifold. The other thing to look for is dirty fuel injector and fuel pressure. Check the fuel pressure at the shredder valve, upon start up there should be 60psi to 65psi and when the engine is running it should drop 5psi. Good luck and hope this helps. keep me posted be glad to help.

Posted on Jun 15, 2009

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1 Answer

Misfire po300


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i can recommend you to RUN the scanner/computer for easy diagnostic and fix it. The electronic vehicle is complicated you have faulty the PCM or BCM.etc.
see the diagram attached.
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I have a 1999 Chevy Blazer 4.3 . It is running bad . I used an OBD II scanner and it pulled up a PO300 code which suggests a Laundry list of things that could be wrong . ...


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My 01 chevy blazer will idle rough. it gives me error codes, p0300 and p0135 and p0141. where do i find these problems


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Sir if the check engine ligh is flashing that indicates a PO300 code which is a missfire code. To determine which cylinder you will need a scanner to find out. The problem could be a failed sparkplug, a failed ignition module for that bank, a failed injector. At any rate it will require trouble shooting to diagnosis. Wish I could help more. Thank you

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1 Answer

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Get your local garage to put a scanner on the car. The early s-type used to suffer from ignition coil faults. If a fault has been hinted towards a specific coil then swap to a different cylinder and see if the fault follows wich will indicate a coil fault.

Has the vehicle had its spark plugs changed? every 70.000 miles as they tend to fail if left unchanged. Intake manifold requires removing to replace bank 1 plugs.

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