Search results

  1. mikemhp

    2004 Yukon..A/C just blowing, not blowing cold

    update- hooked up a relay bypass tester to the a/c relay in fuse box, air conditioning came right on. swapped out that relay (#8866) with the same one next to it, the horn to test. a/c still didn't come on, and the horn still worked ????
  2. mikemhp

    2004 Yukon..A/C just blowing, not blowing cold

    2004 yukon slt 175,000 miles recently replaced computer and fixed transmission issue- A/C was working great, now just blows regular air. not hot nor cold no matter where the temp setting is any suggestions?
  3. mikemhp

    Electrical Gremlins Again

    HELP! 2004 yukon w/180K miles. 5.3 (i believe) great overall shape, but having transmission slippage issues. upon shifting from either park or reverse into drive, transmission wants to start in 3rd gear, and stay there (occasionally). i have had electrical issues in the past, replaced fuse...
  4. mikemhp

    Transmission problem or fuel problem??

    2004 yukon 350- 145,000 miles past couple of weeks been having an issue accelerating. feels like it starts out in 3rd gear from dead stop. won't upshift when at highway speeds either. just hangs out at appx 2K rpm. from standstill it will accelerate ok, but not like normal (first gear, 2nd...
  5. mikemhp

    Strange issue-

    recently replaced fuse block after a major electrical mystery. all is working now, however the fuel gauge now operates in reverse. full tank of gas shows as E (with low fuel light on) and as i drive during the week it steadily goes towards F. obviously something is running backwards, but...
  6. mikemhp

    interior lights issue

    is that a type of scan tool?
  7. mikemhp

    interior lights issue

    2004 yukon slt 2wd. replaced computer, reset security lockout code with the key, starts up great now. however, everytime it starts, the heater comes on full blast no matter what setting it is on and the dashboard lights stay illuminated after removing the key which slowly drains the battery...
  8. mikemhp

    'FLASHED' PCM HELP NEEDED

    new braunfels, TX.. halfway between Austin and San Antonio. what exactly is a 'tech2'? i thought i could purchase an already flashed PCM, install it, and then have the dealer program it to the vehicle? am i totally off-base? i can and do a lot of my own mechanical work on the truck, but...
  9. mikemhp

    'FLASHED' PCM HELP NEEDED

    needing a new PCM module- been hearing lots of differing advice on what/where best place to purchase a new one what does 'flashed' exactly mean? i realize i might have to get it to the dealer to program it to my truck, but would like to avoid dealer pricing on the unit itself. thoughts...
  10. mikemhp

    2004 yukon starter/ignition/wiring issues

    swapped out ignition switch with another new one, batt light still comes on on dash. only goes out when i pull both IGN A and IGN B fuses. still no crank, no start. at a loss here........... any ideas? neutral safety switch maybe?
  11. mikemhp

    2004 yukon starter/ignition/wiring issues

    UPDATE (again).... saw a video how to crank engine by jumping #30 and #87 terminals on starter relay... engine cranks over right away... thinking there is a 'starter interrupt' or similar somewhere on the alarm system i never knew was installed on the truck.. batt holding charge with...
  12. mikemhp

    GMDLBP Programming issues

    having similar issues- batt keeps draining, no click, no start... never even knew there was an alarm on the truck... when charging battery, red light on gmdlbp module keeps blinking... could this be draining my battery? already tested starter, good,,, changed alternator, new battery, new...
  13. mikemhp

    2004 yukon starter/ignition/wiring issues

    that was one of the first things i replaced.... can it be tested? right now i have disconnected power from all the stereo amps, no fuses blown at all, battery has been on charger for 2 hours, reading 12.6, all lights, a/c, dash lights come on like normal, but no crank, no click, no start at...
  14. mikemhp

    2004 yukon starter/ignition/wiring issues

    performed parasitic drain test and pulled fuses one at a time.. here are the suspects: ALL TESTS PERFORMED WITH METER SET AT 10A ON THE DC AMP SETTING.... PCM B (20A) WENT FROM -1.57 TO -1.22 IPC/DIC (10A) -1.57 TO -1.20 TBC BATT (10A) -1.57 TO -1.39 IGN A (40A)...
  15. mikemhp

    2004 yukon starter/ignition/wiring issues

    yes... still starts up in morning, batt not draining as much anymore with everything re-connected after replacing all relays at fuse box under the hood... however, batt light on dash is still lit up. very slow batt drain with engine off, but starts up strong every day since that latest fix...
  16. mikemhp

    2004 yukon starter/ignition/wiring issues

    saw a video regarding a ground wire that goes to the rear of the engine block and suggested to un bolt that and splice a new one over to the braided ground wire on the upper side of the firewall (engine compartment)... question is- on my truck, that wire isn't bolted... just hard-wired to the...
  17. mikemhp

    2004 yukon starter/ignition/wiring issues

    update- swapped starter and park lmp relays. solved batt drain problem. truck starts right up now, but with key off, batt light on dash stays on. in addition, when i turn key off, it used to open the door locks after engine turns off. that is no longer happening. would replacing all the relays...
  18. mikemhp

    2004 yukon starter/ignition/wiring issues

    now i'm getting a drop in voltage from the 2nd new battery even with negative cable disconnected!!!! wtf????? update- voltage drop went away.... think i just needed to let the computer go back to sleep. still having batt drain issues after starting it up then shutting it off... have checked...
  19. mikemhp

    2004 yukon starter/ignition/wiring issues

    new alternator, same issue. something is drawing 31vac from the battery with engine on
  20. mikemhp

    2004 yukon starter/ignition/wiring issues

    alternator tested good at o'reily's saw another video to test for bad alternator diode... w/engine running, put the meter on 200Vac to check for ac volts. read 31.0...... think it should be reading zero is that an indicator of a bad alternator diode even though it tested good at the shop? not...
  21. mikemhp

    2004 yukon starter/ignition/wiring issues

    if i disconnect alternator and check voltage should i be seeing any kind of drop with the engine off? looking to determine if alternator is bad before i take it out and go have it tested; buy a new one
  22. mikemhp

    2004 yukon starter/ignition/wiring issues

    yep... alternator. battery has been charging 2 hours, reads 11.9v, alt disconnected, started right up with no drain on voltage. all accessories came on like normal. plan now is to pull alternator and swap out for new one, FULLY CHARGE the battery, and fingers crossed, problem solved...
  23. mikemhp

    2004 yukon starter/ignition/wiring issues

    i did a further test on the alternator.... thinking that is what is bad. disconnected the alt, hooked up the battery, and charging battery again now. but first time i tested it in that setup, no voltage drop from battery. the stereo/amp setup looks like it is wired better than the rest of the...
  24. mikemhp

    2004 yukon starter/ignition/wiring issues

    update- tried pulling those fuses, radio stayed on... (it's aftermarket with its own separate positive lead and 250A fuse... wired correctly) battery was dead again this morning, pulled it out and charged it up to 12.4. installed it in truck, put the meter on it and immediately it dropped down...

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