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Discussion Starter #1
Hello,

I have a 2007 4.7L Limited. My problem is that when it gets hot outside I start to get random misfires. Last year it would only do it when it was above 85 degrees. This year it is starting when its 70 degrees out. If I'm on the freeway its ok unless its really hot out above 95 degrees. But if I'm in start and stop traffic it will misfire till I drive about 5 mins then it goes away.
The only faults that i get are the P0420, P0430, and the P0300 random misfire. Before i spent $1,000 on new catalytic converters i wanted to check around. Other forums say that this is a common issue with this engine but no one says what the fix is. My gas tank also makes a loud "POP" sound a few mins after i turn the jeep off. I don't know if there is a pressure issue causing problems delivering fuel, or if the catys are to hot causing issues with the 02 sensors, or what.
 

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Discussion Starter #4
I changed it out. It did not work though. Back to the drawing board.........
 
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