P300 code-multiple cylinders misfiring

DMart03 · Feb 23, 2012

My truck was throwing this code last week so I changed my plugs and wires cuz they needed it...code went away. Well it came back today

Any other things that might be causing this? Help me out fellow ram'rs!
Thanks

BlackedOutHemi · Feb 23, 2012

Bad ground?

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03MopaRamman · Feb 23, 2012

I've preached and learned this one! Trust me, If your Plugs coils and wires are good, There is a real good chance Your Fuel Injectors are Real Dirty...P300 plagued me even into this latest Cam swap.

DIY or pay the $$. Up here it cost $200 bucks to have it done proffessionally. So far I have avoided that Option. No cel on my Truck since Dec when I fixed the problem.
I am due for my 3 month preventative cleaning (STP).

Hotroder383 · Feb 24, 2012

You did do cap and rotor with the plugs and wires right? I ask only because my truck the plugs looked good wires weren't bad but the cap was shot and rotor wore out.

DMart03 · Feb 24, 2012

Hotroder383 said:
You did do cap and rotor with the plugs and wires right? I ask only because my truck the plugs looked good wires weren't bad but the cap was shot and rotor wore out.

cap and rotor are good, i think i narrowed it down to the upstream O2 sensor

P300 code-multiple cylinders misfiring

DMart03

Member

BlackedOutHemi

Senior Member

03MopaRamman

RAM SPORT / 18 SRT

Hotroder383

Senior Member

DMart03

Member

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