truck jus fixed, still problem

[fordtruckin]

i just got my truck scaned at Autozone and they said the O2 sensiors were bad. I took it to my local auto shop, and he said the truck was running lean, but it was fine, so all he did was clear the codes, NOW I GET BAD GAS MILEAGE!!!!! someone please help me!!!

 

[udmsvt]

if you have a bad o2 sensor, it can cause the vehicle to run lean or rich. the bad 02 sensor doesnt reall do a whole lot to you beside up-ing the mix, thus reducing gas milage.

when was the last time you did your sensors?

and BTW, even though the code says sensors, it may not be.

 

[fordtruckin]

never got the sensiors replaced before, the check engine light came on sunday. now its off tho.. wat else could it be that could cause the bad gas mileage??

 

[udmsvt]

dunno. i had a 97 contour that did a similar thing. it actually threw several codes and i tried to fix them one by one but never did because i refused to change 02 sensors. it would come and go but most of the time, it would be there.

i know i had a plugged cat convertor, and needed a new egr also, but i dont know what else. i would look into the 02 sensors anyways, i know it should only have 1 or 2 and its usually not that hard to do.

 

[slow-demon]

Is it a SOHC engine. IF it is there is a "Program" (similar to a recall) from ford which is related to the lower intake manifold seals. The leaking seals causes the engine to have a small vacuum leak and run lean. I know it has been talked about a lot on this forum. Call your ford dealer and ask them to run your vin number and see if there is any open recalls or programs for your vehicle.

 

[udmsvt]

good idea...didnt think about a vacum leak, and not being a SOHC owner, i had no idea about the issue.