Random misfire

Asked by TracyTenney Jan 28, 2019 at 12:21 AM about the 2004 Dodge RAM 1500

Question type: Maintenance & Repair

2004 dodge ram 1500 after changing all coils, plugs, wires
and o2 sensor 1 bank 1 . i am still getting codes that says
random misfire and o2 sensor bank 1, high voltage check
engine light...where do i look next??

2 Answers
2,570

Sirkut_Interrupted answered 5 years ago

Does it have blackish exhaust? Or does it stink? O2 high voltage is picking up a extremely rich condition.. (fuel injectors stuck open, shorted on that kind thing. Or a bad map sensor telling the pcm to inject way too much fuel)

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2,570

Sirkut_Interrupted answered 5 years ago

O2 signal wire cld be shorted to the o2 heater wire making the pcm think its running rich taking away all the fuel giving you your misfires, its hard to tell

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