DONT GET BOSCH is ture. Some GM cars doint like them as well and will throw aP0300 too. Now did it do it before or after the plug change. If after, put the factory plug nt it and it should will go away. bad O2 sensors will not make a random miss fire

 

Yes they can... the front (upstream) Oxygen sensors are what tell the computer how much fuel to put in for each injection cycle.

Plugs will contribute more to a misfire and the OP already stated he will change them back to Coppers ASAP.

Faulty O2 sensors can definitely cause random misfires... go read up on how modern OBDII Internal Combustion Engines work and we'll talk.

 

A bad O2 will make eather a lean or a rich fuel mixture, and will blow off a code for bank 1 or 2 if it out of rang. O2 sensors are temp sensors.the O2 reads the exhaust temp to conclude how well the fuel is burning. hot for a lean, clolder for a rich mix. You can unplug a O2 sensor and the motor will still run with out skiping. I also know how a OBDII works. So I ask, if you know so much about OBDII, why are you asking for help?

 

no, disconnecting an o2 Sensor will cause the truck to run on the Open Loop fuel & spark tables, and if it doesn't like the results it gets from other sensors (MAP, IAT, etc.) it may change to Limp mode which causes misfires and bad performance, because it will add fuel.

So lets explain open loop for you. Open loop is a set of tables that are setup to bypass sensors in the event of failures and also to read from under WOT or aggressive acceleration that only allows additives up to a certain level and in set increments, which is why knocking must be tuned out of the Open Loop tables to effectively increase horsepower.

Closed Loop is a set of equations in which determines fuel, ignition timing and other running factors depending on engine & head configurations, which is all based upon MAP, IAT, Oxygen, and other sensor variables in order to determine instantaneous running conditions. If you would really like to get into Dodge Specific running equations, You will have to have an intermediate to advanced understanding of fluid mechanics, thermodynamics, and physics for starters, as well as a good foundation in mathematics so we can run through the derivatives and integration required in some calculations.

Removing one or more of the variables required to run in Closed Loop will cause erroneous values to be calculated and thus the computer will execute Open Loop in order to run somewhat correctly, and it will run checks on the system that is having problems in order to determine if Closed Loop can be used.

Now from what the OP has described we have narrowed things down to Plugs and O2 Sensor. The reason we think O2 sensors may be the issue is even though the computer is not indicating a DTC for the sensor all the time the sensor may still be reporting incorrect A/F readings in which causes the computer to either pull or add fuel incorrectly thus causing a misfire.

We also stated that if the new sensor and plugs do not solve the problem the injectors may be the problem, so we have covered that base as well. The bottom line is there is a problem with misfiring, which is caused by one of the following; Bad Air/Fuel Mixture, bad ignition, bad compression, and/or incorrect fuel octane. (there are more but those are the most common)

So in short yes you can run a truck without an o2 Sensor but it will cause poor performance, including but not limited to misfires.

Also, When did I ask for help? This isn't my thread buddy.

Before you go spouting false information why don't you read through the last 7 pages of troubleshooting we've done with the OP.

Otherwise, go increase your post count somewhere else, I don't have the patience today...

 

Your telling stuff i all ready know, but O2 sensors are not the problem all of the time. and will not cause a P0300

 

Wrong again, they can cause this issue, and when they do it is usually more severe than when plugs/wires/coils go bad.

http://www.obd-codes.com/p0300

 

I personally had a P0300 and it was caused by bad o2 among other things.
A bad upstream o2 will cause a misfire not all the time but sometimes under the right conditions. Skim through the link Izero posted. Hes got good facts and has put time into learning them. Not to mention he can provide them ASAP.

 

Did you ever get your problem solved?

 

thats what I mean just a O2 sensor alone will not do it alone. just a compile of other issues too

 

But even with just a bad o2 sensor alone could cause P0300.
Like i said it may not be every car/truck that has P0300 can be fixed with a o2 sensor but some can. But it dosent take a bunch of other failures to cause the o2 sensor to be the only culprit.