P300 code, I have been getting a p304 code and have done the usual stuff. Plugs,ignition coil, plug wires. Car runs fine, shakes a little when at a stop but runs good otherwise.

Gene Newell

Asked by Nov 05, 2015 at 12:22 AM about the 2005 Dodge Neon 4 Dr SXT Sedan

Question type: Maintenance & Repair

Knocks when cold but gets quite when
warm. Today I got a p300 code, now what?
When I start the car it seems to lag when
starting like its starving for gas. It does start,
but just seems like it labors. Not sure what to
go next

3 Answers


The po300 code is a random misfire, since you replaced plug wires and plugs, Water in the gas can cause this. The po304 indicates a problem with #4 cylinder not firing properly, normal causes would be a plug, or wire, and or a coil for this cylinder. Since plugs & wires have been replaced, the coil would need to be checked out. Last would be a bad cylinder compression. Would do a compression test.

Gene Newell

Did a compression test today. Cylinder 1 was 120 #2 was 120 #3 was 90 #4 80. Did a "wet" compression test on #4 it shot up to 120. So now what is the motor junk or should I just drive it till it dies. Lol


Drive it till it dies, Dodge Neon really not worth anything but scrap price, so ya you have a dying engine. Compression shooting up to 120 means the rings are bad. Looks like more than one cylinder is bad. Sorry...

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