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  1. Mechanic421

    Cheap ODB2 scanners any good?

    Efilive can do anything a tech2 can do and flash your tune if you choose.
  2. Mechanic421

    Hello from STL

    Welcome to the site.
  3. Mechanic421

    Thank you FL!

    Welcome I just moved to North Carolina.
  4. Mechanic421

    04 Yukon Denali self accelerates briefly at prolonged idle

    Wish I knew someone in your area.
  5. Mechanic421

    04 Yukon Denali self accelerates briefly at prolonged idle

    Just moved to North Carolina from south east Florida.
  6. Mechanic421

    04 Yukon Denali self accelerates briefly at prolonged idle

    Were are you located?
  7. Mechanic421

    04 Yukon Denali self accelerates briefly at prolonged idle

    A good shop/scanner should catch the glitch while data logging.
  8. Mechanic421

    Horsepower gains?

    Yes u r right, but we all can’t afford a duramax.
  9. Mechanic421

    Horsepower gains?

    I am pulling up some good grades. I never tow in od. And when I hear it unlock the converter I let off some and let it slow some before it kicks down to second. I don’t like the 4500 pulls either.
  10. Mechanic421

    I want a Silverado SS

    I will take some. Here is a pic of my beast.
  11. Mechanic421

    I want a Silverado SS

    I am about to mod a customers SS and am a little jealous!
  12. Mechanic421

    Towing Question

    Get used to the clunk they all do it. I have had two now. But I’m am going by my experience. Yours my be a different clunk . Mine is transfer case chain. There is a update but I just live with it. I can make mine clunk at will at parking lot speed.
  13. Mechanic421

    04 Tahoe engine replacement, L33 or LQ4?

    Hard decision i have a lq4 and love it. But weightlose is always good thing in trucks.
  14. Mechanic421

    New to Statesville North Carolina

    Thanks
  15. Mechanic421

    I/M Readiness WILL NOT set

    Smoke test for a leak
  16. Mechanic421

    How to reset Long Term Fuel Trim without Tech2

    Unhook negative cable wait 5 minutes reattach.
  17. Mechanic421

    New to Statesville North Carolina

    So October I moved from Port St Lucie Florida to Statesville North Carolina. Well the Denali kicked ass no issues with my 7by16 enclosed trailer over loaded twice 750 miles! I get about 10.5 mpg loaded or empty trailer. Wind Resistance is a *****. So my truck has BBK one and three-quarter inch...
  18. Mechanic421

    Corvette Servo on Denali?

    There is a separate servo for 4th apply.
  19. Mechanic421

    Gibson exhaust update/ review 04 Yukon Denali xl

    I have had a Gibson exhaust system for a couple years now and love it. But a month ago I drilled out heads and put bbk 1 3/4 primarily shortly headers. Wow should have done that a long time ago! So smoother,picked up 2 mpg and I swear it is quieter.
  20. Mechanic421

    2006 GMC Yukon XL air lift install

    Depending on how close to heat sources they are. I did not intstall on my 06 . Had them maybe 2 years of hard towing.
  21. Mechanic421

    Mishimoto 1999-2014 GMT800/900 Performance Radiator R&D

    I have this radiator in my 06 Denali XL lots of mods , south Florida heat,2200-2400 stall converter that makes lots of heat pulling my 5500 lbs 7by16 cargo trailer (large brick). Definitely keeps my temps under control but I was feeling it should cool better though, so yesterday I took my grill...
  22. Mechanic421

    Misfire on 3 and 7 2003 5.3 almost 300k

    Regardless when you change the pcm crank relearn as to be done!
  23. Mechanic421

    Misfire on 3 and 7 2003 5.3 almost 300k

    Always have to do a crank relearn when you change pcm,timing chain, crank sensor , engine and maybe even the cam sensor.
  24. Mechanic421

    Front Differential Noise

    Four jack stands and a long thin screwdriver you should hear the noise through the handle. Hopefully
  25. Mechanic421

    Update on the Denali for you guys.

    Looks great

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