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  1. Burban22

    New Mechman 250 Alternator Question

    @Fless I’ll also look at alternator to see if it has the gap or not. Could have been replaced in the past 20 years.
  2. Burban22

    New Mechman 250 Alternator Question

    I have an 03 burb z71 with every factory option, bose, front rear trizone hvac. I've added a 500w amp with 2 12" subs and LED headlights but other than that its stock. Voltage gauge reads 14 all the time seems fine but when running a 140W power inverter on the rear power plug, if it draws more...
  3. Burban22

    Odd Bose radio issues. No sound when cold. Randomly powers off for a few seconds. Occasional theftlock briefly then works fine.

    20F this am and no sound no chimes but radio powers on and can change stations. Back to its old problems. Oh well.
  4. Burban22

    Long term and short term fuel trims intake leak, low idle, improving fuel mileage. Mpg

    Also replaced purge valve. No change in ST or LT fuel trims. That tells me the old purge valve is good. Going to put 500 or more miles on it in the next few days. Will see if the fuel trims change at all.
  5. Burban22

    Long term and short term fuel trims intake leak, low idle, improving fuel mileage. Mpg

    @Fless Key on engine off 52-54 idle pressure is the same as KOEO Blipping throttle it jumps to 60 then back to 52. Holding at 2 or 3k rpm still settles at 52 - 54. I did the balance test key on engine off, pulsed each injector and they all drop 4-7psi
  6. Burban22

    Odd Bose radio issues. No sound when cold. Randomly powers off for a few seconds. Occasional theftlock briefly then works fine.

    I performed the reheat Hail Mary on the rear seat audio circuit boards as well. I only heated up the bottom of the boards not the front. Didn’t want to melt the RSA display. Got both boards to 380F - 420F. Rear seat audio has always worked, but thought it would get rid of the RSA disconnect...
  7. Burban22

    Odd Bose radio issues. No sound when cold. Randomly powers off for a few seconds. Occasional theftlock briefly then works fine.

    Have had a few 30F mornings and radio has been working fine. Calling it fixed! Still have some odd issues like the radio will just randomly reboot. I'll be listening to radio and it just powers off then comes back on. Still get these codes (probably due to the random radio power cycle) U1000...
  8. Burban22

    Long term and short term fuel trims intake leak, low idle, improving fuel mileage. Mpg

    Disconnected battery for an hour and now get these values. Idle 2k rpm 3k rpm These are all done at operating temp and in park. I’ve noticed engine vibration and feels rough at 2k rpm but smooth at all other rpm, idle. Maybe it’s the clutch fan making vibration at 2k? 1.8k rpm is smooth...
  9. Burban22

    Long term and short term fuel trims intake leak, low idle, improving fuel mileage. Mpg

    I’ve checked the intake air temp sensor and it’s correct according to my scanner. Example 50 degrees out and iat is reading 76 idling.
  10. Burban22

    Long term and short term fuel trims intake leak, low idle, improving fuel mileage. Mpg

    Will disconnecting battery for an hour or longer reset the fuel trims? Probably taking it on a 200 mile road trip soon maybe it will relearn on that trip? My scanners don’t have an option to clear fuel trims but it says all emission test have run and passed
  11. Burban22

    Long term and short term fuel trims intake leak, low idle, improving fuel mileage. Mpg

    I’ll order a replacement delco or Delphi purge valve. 173k miles 2003 LM7 5.3 non flex fuel but I put a flex fuel pump in it with “robust fuel level sender”. The original fuel pump still worked but the gauge sender wasn’t reading level properly. Here’s the Carter P74905M fuel pump I put in...
  12. Burban22

    Long term and short term fuel trims intake leak, low idle, improving fuel mileage. Mpg

    Are you saying I should parts cannon replace the maf and iac to see if fuel trims change?
  13. Burban22

    Long term and short term fuel trims intake leak, low idle, improving fuel mileage. Mpg

    Thanks for the detailed reply! The burb runs great and I’ve seen 15 - 16 on highway going 70 (hand calculated) I’ve replaced: Fuel pump Fuel filter Intake tube and air filter box is aFE performance New NGK (from rock auto) spark plugs New Taylor racing plug wires 4 new Denso o2 sensors Deleted...
  14. Burban22

    Odd Bose radio issues. No sound when cold. Randomly powers off for a few seconds. Occasional theftlock briefly then works fine.

    42F this am and radio works fine! Door chimes and sound I’ll have to wait for a really cold 20F or below morning and test but before it wouldn’t work at temps below 50F.
  15. Burban22

    Odd Bose radio issues. No sound when cold. Randomly powers off for a few seconds. Occasional theftlock briefly then works fine.

    @Doubeleive Thanks for the tip. I had reflowed those leg connections last time I had it out but unfortunately no improvement. Hopefully by heating the main and power boards up fixed it.
  16. Burban22

    Odd Bose radio issues. No sound when cold. Randomly powers off for a few seconds. Occasional theftlock briefly then works fine.

    I’m getting pretty good pulling this out of the dash and removing the guts to get to the main board. I got the main and small power board HOT. Like Brooke shields 1980s hot. I used my heat gun on medium - high heat. 600F to 800F on medium low fan and went as evenly around bottom of board...
  17. Burban22

    Odd Bose radio issues. No sound when cold. Randomly powers off for a few seconds. Occasional theftlock briefly then works fine.

    Yeah it’s starting to piss me off now. Got a random locked message yesterday, cycled key and it’s back to normal. Ugg, I may tear the damn thing down one last time so it’s just the main board in the metal shell, I can get it stripped down but can’t really remove it from the metal box shell...
  18. Burban22

    What can I gain from a tune?

    Amazon is getting a new batch in around November 15th, I have 2 ordered, expected to ship on that date. I’ve ordered from summit as well for other parts. If I get more brand new bad sensors from Amazon I may try Delphi knock sensors. Lots of knockoff brands I won’t try, and reviews of Dorman...
  19. Burban22

    Long term and short term fuel trims intake leak, low idle, improving fuel mileage. Mpg

    2003 suburban z71 5.3 LM7 Here’s some of the info on reading STFT and LTFT
  20. Burban22

    Long term and short term fuel trims intake leak, low idle, improving fuel mileage. Mpg

    From some YouTube videos, I’ve educated myself on monitoring short term long-term fuel trims to diagnose intake, leaks, or bad oxygen sensors. I recently replaced all four oxygen sensors new spark plugs new wires suburban runs very good but fuel mileage isn’t the best 14-16 on the highway at...
  21. Burban22

    What can I gain from a tune?

    Experience with BBP has been good. They’ve done several tunes for me. 97 k1500 5.7 03 burb 5.3 04 Yukon xl Denali 6.0 Only issue is once the Denali with 6.0 was tuned, it now throws a CEL complaining about the rear knock sensor (2) low voltage. This was never an issue before the tune. I reached...
  22. Burban22

    What can I gain from a tune?

    Blackbear tune definitely woke up the ol 2003 z71 burb. I also replaced stock restrictive muffler with magnaflow. My 03 burb with stock 5.3 feels like it pulls stronger than the family’s 6.0 AWD Yukon xl Denali. Both are Blackbear tuned but the burb has 3:73 gears where the Denali has 3:42 or...
  23. Burban22

    LS engine history

    I have 2 sbc and 2 LS engines. I like how the L31 vortec 5.7 makes more low end torque than the LM7 5.3. The LM7 really only makes power in the upper rev range. My 2018 L86 6.2L is amazing and makes plenty of power throughout the rpm range, gets good mileage for its displacement.
  24. Burban22

    Odd Bose radio issues. No sound when cold. Randomly powers off for a few seconds. Occasional theftlock briefly then works fine.

    This summer I reflowed all the large soldier joints and where all the pins connect to the board. I’m amateur at best. I just held my soldering iron on the joint until it liquified then moved on to the next. Only other thing I’m capable of is busting out the heat gun and trying to evenly heat...
  25. Burban22

    Odd Bose radio issues. No sound when cold. Randomly powers off for a few seconds. Occasional theftlock briefly then works fine.

    40F degrees this am. Kept radio in house. Hooked up in cold suburban and works just fine so it’s definitely the radio acting up when it gets cold. Rules out the Bose amp under the console or anything else.

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