few more questions
#1
few more questions
2003 5.4 if oxygen sensors are bad would it cause a truck to miss, got 4 oxygen sensor codes, truck misses from about 60-70 every now and then, if the fuel pumps weak wouldnt it be sluggish ALL the time,
ran the codes and nothing but the 4 02 sensor codes, how can we tell if theres no code!
ran the codes and nothing but the 4 02 sensor codes, how can we tell if theres no code!
#2
ok so i pulled the codes, they are P1151 P0172 P0175 and P0174
quick question what rpm or gear is the truck in when it misfires at 60-70mph? is it at wot?
a weak fuel pump generally shows up at higher rpms when the pump isnt supplying the fuel that the engine requires. a bad fuel pump feels almost exactly like a partially clogged cat. o2 sensors wont necessarily cause misfires but when it sends a signal to the pcm and the pcm changes the a/f mixture then it can sometimes feel like a misfire.
#3
i just wanted to make sure everyone knew what the codes were.
quick question what rpm or gear is the truck in when it misfires at 60-70mph? is it at wot?
a weak fuel pump generally shows up at higher rpms when the pump isnt supplying the fuel that the engine requires. a bad fuel pump feels almost exactly like a partially clogged cat. o2 sensors wont necessarily cause misfires but when it sends a signal to the pcm and the pcm changes the a/f mixture then it can sometimes feel like a misfire.
quick question what rpm or gear is the truck in when it misfires at 60-70mph? is it at wot?
a weak fuel pump generally shows up at higher rpms when the pump isnt supplying the fuel that the engine requires. a bad fuel pump feels almost exactly like a partially clogged cat. o2 sensors wont necessarily cause misfires but when it sends a signal to the pcm and the pcm changes the a/f mixture then it can sometimes feel like a misfire.
well i say miss, it feels like its missing, some guy at ford said it was the transmission slipping and made it feel like its missing, but thats a load of bs cuz hes had the filter and fluid changed 2x now and doesnt rag on it
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#9
if you can find someone with a scanner that can pick up misfire data then i would have them drive it with the scanner hooked up. it'll make things much easier since it wont throw a misfire code. that or just start replacing the coils.
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