I've been chasing this problem for a while now. It started last summer when my 2007 dodge dakota slt 4.7 would misfire when running the ac or hauling a trailer. During the winter the truck ran fine with no problems. Now it's summer again and I'm getting random multiple misfire. Code p0300. When the truck is cold it starts and runs fine.Only when the truck reaches normal operating temperature does it start to have random multiple misfires on all eight cylinders according to my scanner. I been chasing the issue for months now. I replaced the fuel pump assembly, replaced all the spark plugs and all the coils. Replaced all the upstream 02 sensors. Replaced the cam and the crank sensors. And last I replaced the map sensor. And I'm still having a multiple misfire problem. My fuel pressure is 50psi constant. Air flow is 8.4 g/s at idle and 20g/s at 2500rpm. All the injectors are pulsing at the same rate. Spark advance is around 5 to 8 degree's at idle and around 30 at 2500rpm. Need help. ASAP
What makes this problem better or worse?
No misfire when cold. Misfires when at operating temperature.
How long has your 2007 Dodge Dakota had this problem?
RepairPal Certified shops can diagnose and repair your 2007 Dodge Dakota. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
Hello, misfire is going to be caused by:
-spark plug concerns
-coil concerns
-base engine concerns
-valve train concerns
-fuel injector concerns
That's about it. Cylinder head and base engine should be tested - perform a compression test and leak down test.
Make sure ANY and ALL parts used are original MOPAR parts.
You're in the wrong area looking at air flow and oxygen sensors and MAP sensor influence
Use this link to find some shops near you that can help with your concern:
www.repairpal.com/repair-shops
All spark plugs, coils, and injectors are new oem parts. And the truck only has 56,000 miles on it. It only misfires when warm. It starts fine and runs normal until it gets up to temperature.
Joseph- I have the exact same problem with the same year make and model as yours. I've been trying to figure it out for years now. Only a warm weather problem. Had any luck yet?
All spark plugs, coils, and injectors are new oem parts. And the truck only has 56,000 miles on it. It only misfires when warm. It starts fine and runs normal until it gets up to temperature.
Joseph- I have the exact same problem with the same year make and model as yours. I've been trying to figure it out for years now. Only a warm weather problem. Had any luck yet?