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Newbie question regarding misfires...

 
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Old 12-28-2011, 10:30 PM
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Newbie question regarding misfires...

My 99' is returning a p1399, p300-p304, p131 codes. From what I understand, these codes relate to misfiring and a bad primary o2 sensor. From what I've gathered on this forum, I know there are multiple potential causes to misfiring, but can the bad o2 sensor lead to misfiring? And considering the worst case scenario, if the misfiring is actually due to low compression in one of the cylinders, why would I still be getting p300 - p304 on all the other cylinders?

I am thinking that the presence of p300-p304, suggests that the problem is not related to compression loss (unless it's the unlikely case that all cylinders have low compression), because how would misfiring in one cylinder cause misfiring in adjacent cylinders.

Last edited by zadeh79; 12-28-2011 at 10:55 PM.
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Old 12-29-2011, 03:20 PM
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Re: Newbie question regarding misfires...

Most common misfires are caused by the EGR ports needing to be cleaned, spark plugs, spark plug wires, cap/rotor, or lastly a bad injector.


If the o2 sensor isn't reading properly, it could cause less/more fuel to be dumped in depending on how the ECU reads it. So yeah i guess it could have some effect on misfires. Change the sensor first, reset the ecu and drive around. It may take more than 40 miles or a week etc for the codes to return (if they were to return).
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