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  1. MAY03LT

    P0705 "Trans Range Switch Circuit"

    The park/neutral switch also contains the trans range switch. The trs has 4 circuits and depending on where the selector shaft is, it will ground the appropriate circuits. Since there's 4 circuits each with 2 possible values, there are many different combinations. If the pcm sees an invalid...
  2. MAY03LT

    NEED HELP 97 Cheyenne: 4 wire trailer brake stolen, truck will not start 5.0 w/700R4

    My card is up to 2011 but I've lied to it and have been able to read some 12/13's. Maybe it will work the same in reverse. Tell the tech2 it's a 2000 and see what you got. And I'm with sparky the only relation between the trailer and the no start would be if power was sourced from the column...
  3. MAY03LT

    NEED HELP Can p0171 be related to sais

    So SAIS is ruled out. Is the pcm at the latest calibration? I've yet to see fuel delivery cause a p0171 in these trucks but that doesn't mean it isn't possible. Since it's passed vac leak test multiple times, it might be the next step (assuming pcm cal is the latest and greatest). Testing fuel...
  4. MAY03LT

    What are you doing today?

    Today I had the chance to use one of the gm data bus splice packs. 05 astro with no communication with any module. Popped the shorting bar, jumped pcm to dlc, and presto we have contact! Not sure if I'll get to see this one through since the shop that I work at is scared of things like this but...
  5. MAY03LT

    Would you drive through this?

    Exactly. We got enough rain locally that some roads collapsed (ours did not) and there's no way to tell until it's too late. I'm sure I'm going to get this kind of flack when I go back to work on Monday LOL A comparable size SUV with a blue oval on the front.:lipsrsealed: A lot less time...
  6. MAY03LT

    Would you drive through this?

    No sir I sat this one out. I told my neighbor "I can miss work and have to pay for a tow, or just miss work". That neighbor said fuck it and missed work, and paid for a tow, and got charged with accident causing property damage.
  7. MAY03LT

    Would you drive through this?

    This morning the only entrance/exit to my neighborhood looked like this. Based on the water levels on the vehicles that tried to make it, it was at least 18" (although over 24" is possible). While the tow trucks were busy unsticking cars, and neighbors were talking about the situation, a state...
  8. MAY03LT

    Back to bad MPG heat range causing it?

    I was in the same boat and got mine from amazon. There's a 67415 (fits 02-04) on amazon right now for under $160/shipped. Advanced wanted over 3 bills. Also worth noting, I've been having such good luck with delphi pumps that I'm going to use theirs for my wifes Tahoe. Are the codes you're...
  9. MAY03LT

    Back to bad MPG heat range causing it?

    Those stupid canister clips break all the time, a ziptie is a great substitute. It's hard to describe how to situate it so the evap line stays on but it sounds like you have some technical skills so it shouldn't be too hard to figure out. For the fuel sender I would try to get to the fuel pump...
  10. MAY03LT

    I think my starter went out, tips on R&R welcome.

    Mine just crapped out a couple weeks ago. I went in through the top and it wasn't too bad. I couldn't see the top bolt at any point until it was out. Also the vac line to the booster has to come off.
  11. MAY03LT

    Aftermarket radio wiring

    One thing worth noting, there is no "switched 12v wire" in the oem radio harness that typically connects to the aftermarket radios red wire. The fancy adapter also provides this connection. But there are several other places where this signal can be found, I used the thick pink wire in the...
  12. MAY03LT

    Front brake seal question

    The front hub/bearing assemblies are sealed.
  13. MAY03LT

    WTF is THAT Sound in the Background....?

    It did sound like a whisper. I'm terrible at decoding things though. Also you reminded me that the wife is ascared of them ouija boards. Maybe the whisper was telling me to exploit her fear of them.
  14. MAY03LT

    2004 TB Cranks but no start help..

    I'd pull the ignition switch out, put the key in run, and roll the ignition switch dial through acc-run-start and see what you got. This would verify that the switch isn't sticking (leaving only the cylinder as the cause), and we'd know if there was power after going from crank to run. In some...
  15. MAY03LT

    NEED HELP Can p0171 be related to sais

    This video has some good info on the sais and has some o2/fuel trim tidbits.
  16. MAY03LT

    NEED HELP Crank no start 2002 envoy 265000km Slt swb

    If he bench tested the pump and it worked, it points to a problem with power and/or ground to the pump. If you have the means to do your own electrical tests, the gray wire in the fuel pump connector is the power and the black wire is the ground. Remember that the power wire will only have power...
  17. MAY03LT

    Are V8 models Rare?

    Rare enough that I've worked on countless trailblazer/envoy/etc's and have seen three with the v8.
  18. MAY03LT

    What did you do to your GMT today?

    Went out at lunch break and had a no crank condition. Starter took a crap @ 196k. Better that it happened on lunch break then 5 o'clock, that would have sucked. I don't know if any of the OGs remember the up top/fenderwell/underneath debates but this was 100% up top.
  19. MAY03LT

    Overheating issue...please chime in

    Does the 'check gauges' light come on when the oil pressure drops to 0?
  20. MAY03LT

    NEW GM headlight relay (relay #46) GM part# 13506836

    You got it. Yeah the bcm controls the signal to the hdm. IIRC 100% duty for low beam, 70% for drl/perimeter lighting (roughly 2v less).
  21. MAY03LT

    2005 GMC Envoy needs some work

    My Trailblazer and Tahoe have this combo: Low beams replaced with HID Fog lights replaced with HID Silverstar high beams Auto fogs (fogs come on with lows) 6-Hi (fogs and lows stay on with highs) Tis great for the dark country roads.:yes: Some people clean the MAF, MAP doesn't need it.
  22. MAY03LT

    Park Lamp DRL

    The control side is on point. The output side looks like it will work on paper but I haven't done anything like that myself so I can't say it with as much certainty.
  23. MAY03LT

    Another random stall out thread.

    Nice. Yeah 5v I tap signal at the pcm.
  24. MAY03LT

    Another random stall out thread.

    There's a ckp signal pid in one of the engine data thingys. But I've personally verified that the live plot won't catch a fast spike or drop out of cam/crank. You might get lucky and have it drop long enough to get some hard evidence.
  25. MAY03LT

    NEED HELP P0440 code popped up again

    Evap leaks can be a real pita because the tools needed to properly test the system are pricey. So we're kinda limited to visual inspections and statistics. Did you check the gas cap o ring for cracks? Hows everything look around the canister/vent valve?
  26. MAY03LT

    NEED HELP Stalls/dies and key stuck intermittently

    Are the wires going into the plug that you messed with red with white stripe, black, and yellow?
  27. MAY03LT

    What are you doing today?

    Got cracking on this 2.4 honda timing chain tensioner, this has to be one of the tightest bolts in existence. My beastily compressor and badassily impact said "I don't think so" to the crank pulley bolt. So I committed several violations of the automotive code of procedures. My triple stacked...
  28. MAY03LT

    Overheating issue...please chime in

    The clogged radiator is still bugging me. Mostly because I don't know what goes on with the shops process for determining a clogged/unclogged rad, and partially because the passages are so small that once they are gunked up, that's all she wrote. Can you duplicate it sitting in park? Like if...
  29. MAY03LT

    New ecm. but won't start

    Treat it like a typical crank/no start. Can you hear the fuel pump run? Also if you have the means to scan the pcm, post up any codes. Never know if something was unplugged during diagnostics.
  30. MAY03LT

    Overheating issue...please chime in

    So it did get a new rad not just the cap? Just making sure we're on the same page.:cool: