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  1. C

    Slight miss but 6 mpg!!? Need help

    Depends. But turns out my ecm (computer) is bad. Ordered one. I’ll let ya know what happens.
  2. C

    Slight miss but 6 mpg!!? Need help

    Also new plugs and air filter and engine flush then fresh oil and filter. No change.
  3. C

    Slight miss but 6 mpg!!? Need help

    I put all new plugs and wires and coils. No change. I put new throttle body. No change. All new charcoal canister. No change. New purge valve and vent Solenoid and filter. No change. I sprayed starting fluid all around intake while running. No change. I’ll try the smoke test but I’m close to...
  4. C

    Slight miss but 6 mpg!!? Need help

    I’m doing the oil servicing this weekend. And plugs and wires and coils as well. Here’s some more O2 data.
  5. C

    Slight miss but 6 mpg!!? Need help

    No I totally understand. :) but at this point it’s so frustrating. There’s no shop here in Orlando I trust to take it to. I’d love to drop it off and have a proper diagnosis but I just don’t have a place. I think I watched every scanner scanner video he has to try and learn but it’s a lot to...
  6. C

    Slight miss but 6 mpg!!? Need help

  7. C

    Slight miss but 6 mpg!!? Need help

    My scanner is showing in red some values for the throttle position sensor. Position A and B. And absolute throttle position at 5.8% at idle.
  8. C

    Slight miss but 6 mpg!!? Need help

    They were on it when we got it about 4 years ago. Might be time to upgrade.
  9. C

    Slight miss but 6 mpg!!? Need help

    Fuel pressure is at 48 when at idle. 58 when off then turn key to on position
  10. C

    Slight miss but 6 mpg!!? Need help

    Yes cleaned Maf. Ordered new one. Yes that o2 goes from .1 to .9
  11. C

    Slight miss but 6 mpg!!? Need help

  12. C

    Slight miss but 6 mpg!!? Need help

  13. C

    Slight miss but 6 mpg!!? Need help

    Yes I have a decent scanner.
  14. C

    Slight miss but 6 mpg!!? Need help

    Yes. I have a decent scanner.
  15. C

    Slight miss but 6 mpg!!? Need help

    Hi guys thanks for the add to the group. I’m having a real hard time trying to figure out what’s wrong with my 2008 GMC Yukon XL 5.3 4 x 4. I have a slight miss but no codes. I replaced everything in the evap system. Purge valve. Charcoal canister. Vapor canister vent valve. (Pump at gas station...
  16. C

    Slight miss but 6 mpg!!? Need help

    Also not showing anything for the misfire data. 0 which seems odd since I can feel it when accelerating and while sitting at a light. But not all the time very intermittent.
  17. C

    Slight miss but 6 mpg!!? Need help

    Yes I have been taking my scanner with me on my landscaping route and watching the fuel trims. They look fine. My o2’s also look fine at about 750 to 850. I added a pic of something I don’t understand. The throttle position numbers in the red.
  18. C

    Slight miss but 6 mpg!!? Need help

    Hi guys thanks for the add to the group. I’m having a real hard time trying to figure out what’s wrong with my 2008 GMC Yukon XL 5.3 4 x 4. I have a slight miss but no codes. I replaced everything in the evap system. Purge valve. Charcoal canister. Vapor canister vent valve. (Pump at gas station...

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