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.

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

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

223,925

Rowefast answered 9 years ago

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.

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Gene answered 9 years ago

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

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223,925

Rowefast answered 9 years ago

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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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.

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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.

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