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  1. R

    Fuel backing up in filler neck at pump

    Thanks a lot. This was very helpful.
  2. R

    Fuel backing up in filler neck at pump

    2011 Tahoe LT. So I did the research on here and determined it seems like the tank purge solenoid is bad. I’ve seen several threads that were a little confusing to me. To verify, we don’t have a metal flapper valve in the filler neck right? I honestly never paid attention to that and my thought...
  3. R

    Running rich after replacing all injectors

    So I replaced all the O2 sensors a while ago and they were GM replacements. It ran just fine too. It has all new GM sensors actually except the crank sensor. I think what did it is I fill up 3 miles from home. I read that it takes 7 miles from filling to learn what it needs to about what fuel is...
  4. R

    Running rich after replacing all injectors

    My apologies to fless as I did not see your comment suggesting this
  5. R

    Running rich after replacing all injectors

    Bingo!
  6. R

    Scan tool to reset ethanol percentage

    So I’m pretty sure I need to reset the algorithm for the virtual flex fuel sensor. Is there a scan tool that can accomplish this that’s not specific to GM? I’d like to be able to use it on other vehicles. Even better if I could permanently turn off AFM and get rid of the range module. 2011 Tahoe...
  7. R

    Running rich after replacing all injectors

    I just had a thought! Alcohol content reading off?
  8. R

    Running rich after replacing all injectors

    When I reset the fuel trims they work their way up to -18.8. Then they go to -30.5. I’m going to run it today and get some figures.
  9. R

    Running rich after replacing all injectors

    It’s steady at 43 which I see is normal for the LMG. Where can I see what numbers are normal for the other sensors? I think everything is normal other than the richness. I have an innova 5610 scanner. It reads everything.
  10. R

    Running rich after replacing all injectors

    Alright… after driving forever it’s running rich on both banks. There are zero vacuum leaks. Is it really just the injectors flowing way more than it’s used to? I don’t know what I could be missing.
  11. R

    Running rich after replacing all injectors

    I ordered the GM ones from Rock auto. The have the GM part numbers on them. The numbers matched the originals. I reseated the intake and retorqued it. Emptied a can of brake clean on it again. Nothing. And now there’s a hesitation off the line. It’s getting aggravating.
  12. R

    Running rich after replacing all injectors

    I’ll give it a try with the settling down. All of the connections are good. I can’t think of anything else it could be.
  13. R

    Running rich after replacing all injectors

    Alright… it’s still doing the same thing. I doused the intake and injectors in brake clean and there’s definitely no vacuum leak in that area now. I checked around for other leaks and I don’t see anything. When I put the range module in thought all is well. I don’t get it.
  14. R

    Running rich after replacing all injectors

    So it’s a seal. When I was spraying the intake what I couldn’t see is the brake clean was pooling up over the intake and getting sucked through the injector seal in the intake. It’s annoying cause I lubed the seals before putting them in. Oh well lol.
  15. R

    Running rich after replacing all injectors

    It’s either an injector seal or the intake manifold. I’m going to pull it and seat the injectors on the manifold properly off the car and just replace the gasket while I’m at it. How common is it to replace the upper intake gasket?
  16. R

    Running rich after replacing all injectors

    You were right. Big intake leak. Crazy cause it runs so smooth lol.
  17. R

    Running rich after replacing all injectors

    I guess I can spray some brake clean to check for one. It seriously is smooth
  18. R

    Running rich after replacing all injectors

    It’s not running like it has a vacuum leak. Also I put the range module back on and the fuel trim codes went away on their own after just 15-20 miles of driving.
  19. R

    Running rich after replacing all injectors

    It’s a 2011 Tahoe LMG 5.3. The injectors were the factory GM ones that I bought new from rock auto and matched the numbers of the ones I pulled off. I didn’t graph the fuel trims but they stayed at -30.5 driving on both banks and went down to -25.2 when idling. I did not pull a plug. The exhaust...
  20. R

    Running rich after replacing all injectors

    Ok so all sensors have been replaced a while ago except crank sensor. Plugs and wires done as well. All GM/AC Delco parts. I replaced all injectors last week and it’s running super rich. So much so it through the P0172, P0175, and P0420 low catalyst efficiency codes this morning. What’s weird is...
  21. R

    Low RPM idle and vibration 2011 Tahoe Z71

    Well crap lol. I guess I’ll be getting a tuner then. I was wondering if it was an AFM issue but it had a range unit plugged into the OBD port when I bought it. I like to do this myself so what’s a good tuner to get or does it even matter?
  22. R

    Low RPM idle and vibration 2011 Tahoe Z71

    Hello all. First post after owning the above mentioned Tahoe for a month. First I will list all I have done to it: AC Delco everything -air and oil filter with oil change -plugs -wires -coils -MAF -MAP -O2 sensors -cleaned injectors -cleaned throttle body -cleaned throttle body connector...

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