Intermittent P0171 and p0300

[chevy1500]

HOLY $@&! Your long term FT B1 is stupid high about maxed out. There’s your problem. It’s having to dump fuel to B1 to compensate for B1 lean condention. So think about things that will only effect one bank... intake manifold gasket etc.

I changed the intake gasket ,maf,plugs,wires,fuel pump oem,sprayed around the intake no change in idle or fuel trim and it still has a slight idle shake oh and all the injectors are shooting like they should so i dont know whats next ??

 

[chevy1500]

Oh and i noticed that my new evap purge solenoid keeps purging everytime i touch it its always on too

 

[chevy1500]

I notice the cat temp is always higher than the bank 2 side if im reading it right

 

[chevy1500]

Hello guys back again with my intermittent p0171 pending code . I was driving my truck down the street with my scanner hooked up and i notice every time i let off the gas the LTFTRM1 spikes up to +24 as seen in above pics and every time i accelerate and let off the gas it will kick into. 4 cylinder mode and LTFTRM1 will spike i did this 5xs already so I checked everything once again so i dont know where to look besides fuel pump,intake gaskets and I switched the 02 sensors no change at all

 

[HiHoeSilver]

You have a vacuum leak on drivers side. You just haven't found it yet. Check the injector Orings?

Edit : can you see live o2 sensor data? What is bank 1 sensor 1 doing?

 

[chevy1500]

You have a vacuum leak on drivers side. You just haven't found it yet. Check the injector Orings?

Edit : can you see live o2 sensor data? What is bank 1 sensor 1 doing?

Yes i can see the live from that bank and 02s1b1 showing 0.765 lowest 0.80

 

[HiHoeSilver]

Yes i can see the live from that bank and 02s1b1 showing 0.765 lowest 0.80

Is it bouncing from one to the other and back every second or so ? It should be.

 

[chevy1500]

Is it bouncing from one to the other and back every second or so ? It should be.

Yes the numbers are changing every second

 

[HiHoeSilver]

Yes the numbers are changing every second

What happens to bank 1 short term when you get on the gas?

 

[chevy1500]

What happens to bank 1 short term when you get on the gas?

0.0 or - 0.8 -11.7 its irratic it keeps subtracting

 

[chevy1500]

 

[chevy1500]

part 2

 

[HiHoeSilver]

Bank 1 vacuum leak no doubt.

 

[chevy1500]

Bank 1 vacuum leak no doubt.

Ok just now i just sprayed some carb cleaner on #1 injector and the engine stumbled short term went up to - 10 sprayed again and its not doing it anymore smh

 

[HiHoeSilver]

Ok just now i just sprayed some carb cleaner on #1 injector and the engine stumbled short term went up to - 10 sprayed again and its not doing it anymore smh

You're getting warmer. You're on it now. That data is undeniable. Chase her down, bro. It's there somewhere.

 

[chevy1500]

You're getting warmer. You're on it now. That data is undeniable. Chase her down, bro. It's there somewhere.

Im.going to buy Orings now will give the update when im done

 

[chevy1500]

Update : changed the Orings and no dice still throws the p0171 code

 

[chevy1500]

Update : changed the Orings and no dice still throws the p0171 code

 

[chevy1500]

Update guys come to find out one day i was cleaning my 05 tahoe engine area while it was running so i was like let me take off the oil filler neck and she started surging a lil capped it back up normal so i went over to my 07 my filler neck wasnt seated all the way in due to a broken tab ...luckily i had a extra one i replaced it and no more p0171 codes but now i get smoky start ups in the morning or after sitting a few hours smh

 

[afpj]

duplicate sorry