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New User

Nov 25, 2012, 4:38 PM

Post #1 of 2 (1045 views)
Misfire Sign In

I have a 2004 Impala 3.4 that I have changed the plugs & wires.

When the engine is cold it starts well and idles smoothly.

Once it warms up the idle is rough and I get the P0300 code again.

Any ideas?


Ultimate Carjunky / Moderator
Discretesignals profile image

Nov 25, 2012, 4:58 PM

Post #2 of 2 (1023 views)
Re: Misfire Sign In

P0300 is a random misfire code. The code doesn't point to any particular cylinder. Without knowing which cylinder(s) are skipping, you won't have any direction. Your going to have to take it to a shop that can access the misfire current and history information using a high end scan tool to determine which cylinders are skipping. Once you have that information you can focus on those cylinder and determine the reason for the misfires.

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

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