P0171 & p0174
#1
P0171 & p0174
Been having issues for a while now without any codes. Symptoms include misfire under load and thats about it. Occasionally the SES light would flash while misfiring going up a hill on the freeway. Hills in general is the only time I would have the misfire, or getting on the freeway.
Anyway, did a light tow of a small trailer and it got really bad. SES flashed but when it was done it did not stay on. For sharts and giggles I decided to do a scan and codes P0171 and P0174 popped up, remember the SES Light DOES NOT stay on while running. Like I said I've been having this problem for the past year and a half with no avail in fixing it. Since it started I have done:
Plugs, wires, cap, rotor, air filter, fuel injector, fuel filter, fuel pump, intake gaskets. I've also swapped multiple sensors from another blazer to test if I had bad ones (I didn't).
I've looked up some probable causes and solutions to these codes, most I have done (replace parts, sensors). I tried testing for a vacuum leak but couldn't find anything. I also replaced O2 sensors 2 years ago (before the problem arose).
Hoping someone can maybe give me a few more ideas more direct to what I have going on, thanks.
Anyway, did a light tow of a small trailer and it got really bad. SES flashed but when it was done it did not stay on. For sharts and giggles I decided to do a scan and codes P0171 and P0174 popped up, remember the SES Light DOES NOT stay on while running. Like I said I've been having this problem for the past year and a half with no avail in fixing it. Since it started I have done:
Plugs, wires, cap, rotor, air filter, fuel injector, fuel filter, fuel pump, intake gaskets. I've also swapped multiple sensors from another blazer to test if I had bad ones (I didn't).
I've looked up some probable causes and solutions to these codes, most I have done (replace parts, sensors). I tried testing for a vacuum leak but couldn't find anything. I also replaced O2 sensors 2 years ago (before the problem arose).
Hoping someone can maybe give me a few more ideas more direct to what I have going on, thanks.
#3
Been having issues for a while now without any codes. Symptoms include misfire under load and thats about it. Occasionally the SES light would flash while misfiring going up a hill on the freeway. Hills in general is the only time I would have the misfire, or getting on the freeway.
Anyway, did a light tow of a small trailer and it got really bad. SES flashed but when it was done it did not stay on. For sharts and giggles I decided to do a scan and codes P0171 and P0174 popped up, remember the SES Light DOES NOT stay on while running. Like I said I've been having this problem for the past year and a half with no avail in fixing it. Since it started I have done:
Plugs, wires, cap, rotor, air filter, fuel injector, fuel filter, fuel pump, intake gaskets. I've also swapped multiple sensors from another blazer to test if I had bad ones (I didn't).
I've looked up some probable causes and solutions to these codes, most I have done (replace parts, sensors). I tried testing for a vacuum leak but couldn't find anything. I also replaced O2 sensors 2 years ago (before the problem arose).
Hoping someone can maybe give me a few more ideas more direct to what I have going on, thanks.
Anyway, did a light tow of a small trailer and it got really bad. SES flashed but when it was done it did not stay on. For sharts and giggles I decided to do a scan and codes P0171 and P0174 popped up, remember the SES Light DOES NOT stay on while running. Like I said I've been having this problem for the past year and a half with no avail in fixing it. Since it started I have done:
Plugs, wires, cap, rotor, air filter, fuel injector, fuel filter, fuel pump, intake gaskets. I've also swapped multiple sensors from another blazer to test if I had bad ones (I didn't).
I've looked up some probable causes and solutions to these codes, most I have done (replace parts, sensors). I tried testing for a vacuum leak but couldn't find anything. I also replaced O2 sensors 2 years ago (before the problem arose).
Hoping someone can maybe give me a few more ideas more direct to what I have going on, thanks.
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