Thread: Misfire problem
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Old 10-04-2013, 07:54 AM
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tjbiker031 tjbiker031 is offline
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Join Date: Dec 2011
Location: Bradenton, FL
Age: 32
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Vehicle: 2002 Dodge Ram
Trim Level: SLT - Quad Cab
Color: Graphite Metalic
Engine: 2002-2007 287ci (4.7L) PowerTech V8 235hp 295lb/ft
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Originally Posted by namretsud View Post
Most newer vehicles are rev limited by the engine controller while not in drive. Another possibility is that you have a cat starting to go out on you. you can test by removing the o2 sensor on the side you suspect and tie it off somewhere safe while still plugged in and go for a drive. If you see improvement, then the cat on that side is going. Found this thru experience.

.........OR just use a IR Thermometer to test the input and output temps. The outlet should be 100* hotter than the inlet after running @ 2500 RPMs for 5 minutes. If not then you have a bad cat.

What namresud described is an incorrect way to test and will cause the vehicle to stay in Closed Loop operation (not good)
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Last edited by tjbiker031; 10-04-2013 at 10:53 AM. Reason: Proper diagnostic info added.
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