Question-when changing injectors, do you have to bleed the system afterwards, or can I just swap them?

3 days ago (Monday) I pulled off the fuel rail and cleaned the soot off of all 4 injectors. I also cleaned the MAF sensor and changed the air filter. Then I cleared all the codes from the computer. For the next hour, I drove around and there were were no codes. The car idled smoother, and all seemed great. Then, one by one, the 3 lights came back on (TC, ABS, and check engine). Some, like the TC, came on while the car was not moving-sitting at a traffic light. When I checked for codes, I had 4-2 for P0131 and 2 for P0171. I had only gotten that code once before, about a month ago, then never got it again until Monday. Since then, I have checked for codes 3 times a day, and only get the 131 code.

The car has 84,000 miles on it. How long do fuel injectors last? The engine has more hours on it than the miles predict-lots of city driving and lots of the car just idling while I wait for people (either to keep the heat or A/C on).

I need to get this resolved in the next 2 weeks so I can pass inspection.

Thanks for any help you can provide

 

The fuel injectors shouldn't need to be bled from what I am aware.

Fuel injectors can last forever, or crap out after a few miles - too many variables to make an estimate on their life.

the p0131 points to the downstream o2 sensor - ie: https://www.obd-codes.com/p0131

I suspect your downstream sensor is either needing a replacement or has a wiring issue - "•Faulty o2 oxygen sensor
•Short to voltage on O2 signal circuit
•High resistance or open on O2 signal circuit"

That p0171 might be gone, or waiting to pop back on - have a read on that issue: https://www.obd-codes.com/p0171

edit update: ACK! - make that the Upstream sensor!

 

If the injector wasnt injecting properly wouldnt it be running VERY poorly? Could be a simple fix with that O2 sensor! Cheaper than injectors!

 

Whaaaaaat? the starting post was already posted elsewhere - arghhhhh.

this thread is CLOSED.