Hey guys.. I've been messing with this van for a few weeks now. I can't get the missfire to go away. Its a 2005 Dodge Caravan with the v6. I believe 3.3.

First - New Plugs and Wires from Napa (Got the Premium wires)

It ran better, but still had a light coming on for p0300 and somtimes for a cylinder. Once for cyl 3, once for cyl 6, So i put a new coil pack in it as well. Now coming back p0300 and p0306.

I'm now at a loss for what to do. I'm trying to keep this as cheap as possible, but has proven to be getting expensive slowly.

Thanks for any help!

 

A quote from a popular OBD code info site:

"Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open."

 

I'll check for any vacuum leaks. Wouldnt I get an EGR code if it were the valve? Any way to test for a intake manifold leak? Thanks for your help!

 

EGR code? It would be heavenly if that were the case.

Manifold leak test? I like to use brake cleaner because it doesn't leave an oily film. Start the engine then spray the brake cleaner around the manifold seal. If you hear the rpms change at a certain spot you found a leak.

Another cause would be low fuel pressure. Check pump pressure with a pressure gauge.

http://www.random-misfire.com/