trouble codes for 1998 expedition
I have a 1998 expedition, v8 5.4L. i have trouble codes P0136, P0156, P1131, P1151, P0171, P0174. I changed all 4 oxygen sensors and it still runs really rough. i was told to change the mass air flow sensor. i'm really a novice and it took me all day to change the oxygen sensors with the help of my wife who has skinny hands. any input or suggestions would be appreciated.
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First of all oxygen senors CAN NOT make an engine run bad. Its not possible, but im not sayin yo wasted your money by replacing the sensors. With the codes u have, ur vehicle is telling me that your o2s are not switching properly, upstream and downstream and banks 1 and 2. U are also running lean on both banks. The tricky part is figurin out y ur o2's are not switching correctly. U could have catalst issues, fuel issues and air issues. Its hard to determine whats happening without seeing what the o2s are actually doing.
U r correct the mass air flow sensor can cause some of these issues. The sensing elements are so small and sensitive i have seen a bug wing or leg make an engine run awful. U can remove the sensor and inspect it closely see if u can see anything. I would recomend using MAF cleaner to clean the sensor. Due not use brake parts cleaner it can damage the sensing elements in the sensor. U can also use some air duster, u know the compressed air made for keyboards, works really good. U do not want to use shop air unless it is regulated really low, this can also damage the sensing elements. U may also want to check for vacuum leaks. Check around your PCV hoses, and any rubber vacuum hose. I would also recommend checking your fuel press... I hope some of this information helps and good luck... |
i removed the MAF sensor and sprayed it generously with MAF cleaner and then used compressed air to try and clean it. hopefully i didn't damage it because i used shop air (did all this b4 reading your post). i did notice some trash (maybe a bug wing) stuck to it and it wouldnt come off. so i carefully removed it with my finger nail. again hope i didn't damage it more (remember i'm a novice). no change in how it's running. I appreciate your advice. i think i'm gonna change the sensor and see what happens. got a friend that has connections at a parts store to let me try and see what happens and then bring it back if it doesn't fix the problem. after that it may roll down a cliff unmanned. only problem is there aren't many cliffs in south louisiana. LOL thanks again
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I can't believe you wasted all of that money and time on this. Your problem is nothing more than a large vacuum leak at the intake manifold. So either the intake gasket has a problem or the PCV elbow at the rear of the intake is split open.
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well, einstein, maybe i'm not as smart or have as much experience as you. fyi it was the pcv hose that split at the rear of the intake.
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Originally Posted by elpadrino13
(Post 9583245)
maybe I'm not as smart or have as much experience as you.
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believe you me i would've asked first if i knew about the website before i started the process but i didn't. bottom line is i wasted the time and money but the website genuinely helped me fix the problem, and i did learn a valuable lesson for the future. not sure why your frustrated, my mistakes are my mistakes no one elses.
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