Random misfire and code P0300

Tiny
KATHY JO
  • MEMBER
  • 2008 DODGE AVENGER
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 70,000 MILES
I have the vehicle listed above my boyfriend got it from one of his friends. It has a motor from a 2011 and it my question is the motor and exhaust that was originally in the car had the air injection system on it but the 2011 motor that they put in the car it did not have the air injection system. So with them leaving the exhaust manifold from the 2008 motor on to the 2011 motor will that cause it to have a random misfire? How much does that air injection system actually have to do with this? Is this why I'm having a problem because I got a code p0300 random misfire.
Monday, September 2nd, 2019 AT 1:12 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 52,273 POSTS
Hello,

Usually the random misfire is a mixture issue I would try a new MAP sensor. Remove it to see if it holds vacuum. Check out the diagrams (below). Please let us know what you find. We are interested to see what it is. Also make sure you have the correct spark plugs it will not run correctly with anything else the chart is below as well.
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Tuesday, September 3rd, 2019 AT 6:18 PM

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