O2 and PCV shot. no get up and go

[Barrett86]

OK, im back from forever, so i now know my o2 sensor on the drivers side im guessing its the p0171 bank 1 system too lean code. if i use a code reader to clear it, it will come on a mile or 2 down the road so its shot. i know my PCV valve is messed up. So if i stomp it now, it takes like 4-6 seconds before it does its get up and go.now why would it take that long. could having a messed up PCV screw with it.i have a replacement but trying to get hard plastic over that nipple on the new pcv is a joke. btw its a 99 XLT with the 4.0 SOHC. and i know having a bad o2 will make my gas mileage go way down. im getting like 12 mpg, is that normal for the 4.0, and i know for a fact my 86 bronco with the 5.0 got way better so is it just my bad o2 thats giving me **** mileage.

 

[ThePhoenix]

normal is higher. I get 15-16mpg...IMO 20 is possible

when I had the same codes, it was a clogged fuel filter and old plug wires

 

[NHale623]

Why are you so certain your oxygen sensor is shot? Maybe the engine is really running lean?

 

[Barrett86]

im sure because it keeps throwing the same code. i also replaced 9 year old plugs and wires, why is it that old ppl dont ever have tune ups done. so now i have new plugs and wires and i notice more power it just hesistates, as per the issue of a bad o2 sensor and a plugged pcv valve.

 

[aldive]

Your mileage is indeed low.

I would look upstream from the O2 sensor(s) for your problem.

Good luck ....

 

[Barrett86]

for what like vac leaks. i need some insight. i hate v6's so im not going to go fiddling around.

 

[NHale623]

Looking for a vacuum leak would be a very good start. Especially around the lower intake manifold.

A scanner to look at the function of the oxygen sensor would also be helpful.

 

[Barrett86]

found my get up and go problem, as i said my pcv valve was bad i replaced it and i have way more get up and go now. now to tackle the low mpg issue lol.

 

[ThePhoenix]

let us know

 

[Turdle]

You can go to an exhaust shop to have the cats tested-they usually do this free of charge as an estimating procedure. I am inclined to think they may be clogged a bit.

 

[Barrett86]

alright will do. but how would my cats being clogged give me low MPG.

 

[aldive]

alright will do. but how would my cats being clogged give me low MPG.

By not allowing th motor to exhale.

 

[Barrett86]

exhaust shop where i got my exhaust done said my cats are fine ALL FUKIN 4 OF THEM.y the hell would ford be retarded and put 4 of them on our rigs.

 

[Turdle]

yeah-
in case one burns out, there is a secondary one to protect us all from certain death.

Same logic would put 2 tires at each corner.

 

[Barrett86]

yah thats 2 cats NOT 4