Quote:
Originally Posted by aa010175
I put the car all back together after finding nothing wrong that I can see. The car started up and ran normally. But before I started the engine I looked at the codes again that was tripped. It had a PO300 random multiple cylinder misfire detected and a P0303 cylinder 3 misfire detected and a PO304 cylinder 4 misfired detected. After driving it 2 miles PO172 system to Rich bank one showed up again but nothing else. What would make cylinders 3 and 4 misfire and could a misfire trip a P0172 code? Thanks Dave
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Unburnt fuel from misfire(s) will cause a rich code. Fix your misfire problem and the P0172 will likely go away. If your spark plugs for cylinders 3&4 are wet with fuel then you have a spark problem or too much fuel for the mixture to spark and ignite. A bad injector seal will not show up in resistance testing. Do you still have your old injectors?
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