Most likely it's an O2 sensor issue.
OBD-II Trouble Code: P0420 Catalyst System Efficiency Below Threshold (Bank 1)
hey guys i have one question relating to a tank fill up i did the other day
Car was running fine until i filled up the tank. i little bit down the road the car first started to like die out. i saw the RPMS drop to like 300, this happened while i was accelarating ever so slightly. since then when the car is on, doesnt matter if its in park, neutral, or in drive, it feels like there is this THUMP coming from the back of the car, you can kinda hear it to, when this happens the car bogs a little. i ran that tank till it was empty and filled it up again at a different station and still no difference, also it hessitates to accel sometimes. could it be the fuel pump??? something wrong with that first full tank or something else??? car started ticking to. DD so please help
sorry dont mean to hijack the thread but i felt someone could help me here since i think it might be fuel related and since thats what you guys were talking about...
Thanks
oh, forgot to mention that after the car started to die out the first time, the next day i died out completly at a stop sign
Car was running fine until i filled up the tank. i little bit down the road the car first started to like die out. i saw the RPMS drop to like 300, this happened while i was accelarating ever so slightly. since then when the car is on, doesnt matter if its in park, neutral, or in drive, it feels like there is this THUMP coming from the back of the car, you can kinda hear it to, when this happens the car bogs a little. i ran that tank till it was empty and filled it up again at a different station and still no difference, also it hessitates to accel sometimes. could it be the fuel pump??? something wrong with that first full tank or something else??? car started ticking to. DD so please help
sorry dont mean to hijack the thread but i felt someone could help me here since i think it might be fuel related and since thats what you guys were talking about...
Thanks
oh, forgot to mention that after the car started to die out the first time, the next day i died out completly at a stop sign
Your symptoms sound like a fuel pump, is the car throwing the CEL? If so get the code pulled at an auto parts store and tell us.
Run some 93 thru it just to see if it was the gas to, and change the fuel filter as soon as possible, might as well start cheap and see if that is the problem...
thanks for that link my ford book is word to work except this link had given me better understanding of what im watching on the o2s on predator thanks.to the guy with problem what type of scanner you using?a bad cat can happen anytime or never.an o2 is like screws on a carb.when they are bad your pulse rate 4 injectors change .then to much fuel gets to cats.o2 are a cheap repair .
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No the car is not throwing any codes other wise i would just check it with my tuner. I already changed the fuel filter and no change. Where i live the highest octane we have is 91 and thats the only thing i use. i tried some octane boost when i went to fill up the tank this last time and still no change... If it is the fuel pump how much do you think that would cost me??? Can i install it myself or is it too hard???
thatks again for any help:SNSign: