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1998 Dodge Dakota Base Reg Cab 112 WB Sport

1998 Dodge Dakota
Trim Info:
Rear Wheel Drive, Reg Cab 6.5'
20 mpg city / 25 mpg hwy
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August 14, 2012, 7:32 pm

Steve M

Question: PO300 code - random misfire

I recently had my check engine light come on in my 2005 Dodge Dakota. It has a 3.7 L V6 engine.

I used an OBDII reader on it and "PO300 -random misfire detected" was the code that came up.

What makes it somewhat more odd is my after market car alarm stopped working as soon as the CEL came on.

I first checked to see that my battery was still good. Go with the easiest one first. It seems it is fine, so it isn't due to lack of charge. What made me think it might be that is when I first start the truck, the engine runs low idle/rough for 20 45 seconds, then the idle becomes normal and I have no problems. While the idle is rough the CEL flashes and after it the issue goes away the light comes on solid.

I am looking at getting the plugs, coil packs and fuel filter replaced as it is likely due for such treatment.

Does anyone have any other theories as to what this may be, factoring in the check engine light behavior, the rough idle for the first 20 to 45 seconds then returning to normal and the car alarm ceasing to work when the problem arose?

I appreciate all input and ideas and advice!

August 19, 2012, 8:42 pm

Ron W
Expert Mechanic

The flashing check engine light indicates severe misfire. the solid light is the code stored. Definitely start with spark plugs. It may be all you need to fix the issue.

For all hard starting or engine performance issues, you should always start with the basics. Make sure the tune up items are done and check the charging and starting systems. The engine must have the basics done in order for it to be able to run correctly. Many things can cause this type of problem, and the simplest sometimes get overlooked.

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