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  1. M

    C0327 while in A4WD?

    So as an update, I had the same thing happen - but this time, it was more 'serious.' The code tripped (and the dash light) and I lost ALL the lights above the switch. I turned off the engine and shifted it to 2WD, and the four lights (plus N) would show up on the switch when I fired it up, but...
  2. M

    What is the rear wheel speed sensor?

    I imagine mine would have the separate wheel sensor as the speedometer works, right?
  3. M

    What is the rear wheel speed sensor?

    On my 04 Envoy, I've been getting a C0055 code on my Bosch scan tool. It says the MIL is requested - but it has NEVER tripped a light. I don't believe I have any other symptoms (though I may be mistaken - it's had this code since I bought the vehicle). I decided to probe further - using my scan...
  4. M

    C0327 while in A4WD?

    On my 04 Envoy 4.2L, I've noticed twice a 'minor' error. The first time, I was driving on the highway and it was pouring rain. I put the Envoy into A4WD just in case and it worked flawlessly - but it tripped a C0327 code. It would NOT shift to 4WD or 2WD (by turning the switch). Once I shut...
  5. M

    A/C Concerns

    So I know it's not the optimal solution, but I did some checks. I was low on oil in the system (using a oil tester) so I added some RedTek oil and also their dry12 (to remove moisture). In doing so, my A/C compressor is MUCH quieter (almost silent). I suspect I will need to do more work in the...
  6. M

    A/C Concerns

    I didn't check the gap - I actually didn't see any shims (would they be on the pulley itself or the clutch?). Also, the chirping goes like this: "chirpchirpchirpchirpchirp..." while the clutch is engaged, and it it's pretty loud. If it's normal, I'll live with it (of course, haha). I checked...
  7. M

    A/C Concerns

    04 Envoy 4.2L I've noticed that my AC compressor on my Envoy squeals when engaged - It will almost chirp while engaged (sounds like a bad bearing to me). I also have noticed that the AC line going over the engine frosts up VERY easily and the AC compressor DOES NOT cycle off very often. I've...
  8. M

    Which headlight bulb is the DRL in Canada?!

    I mean on sites like Canadian Tire. It lists the 9005 bulb for the Envoy as a highbeam, DRL; and the 9006 as just lowbeam. What I was trying to say is exactly that - I believe the listing is wrong (or that the 9005 is/was used for a DRL on other vehicles and the description was carried over)...
  9. M

    Which headlight bulb is the DRL in Canada?!

    Ah, thank you. So the listings that say High Beam, DRL are actually just more for generic information and not model specific?
  10. M

    Which headlight bulb is the DRL in Canada?!

    I've seen that it is supposed to be the high beam (physically lower bulb) on the Envoy. However, on mine, it is the low beam (physically higher bulb). Are bulb descriptions wrong, or is the DRL supposed to be the high beam?
  11. M

    Rear G80 fill plug replacement?

    That is actually great to hear! From what I gather, it's a 1/2" NPT? Does it matter what type of material it is?
  12. M

    Rear G80 fill plug replacement?

    So, I decided to check my rear diff fluid on my 04 Envoy - and the plug was stripped and very tight. I was able to get it out and check the fluid, and I was able to put it back in (for now), but I was wondering if anyone know of any part number for the plug, or if a universal one would work with...
  13. M

    PCMofNC Swap - couple questions

    So I got the PCM today - and was expecting to need to do the security relearn (set aside an hour) and the thing started up on the first attempt! There is definitely an improvement (however, I will admit, I don't see as large of an improvement as some have said). I did notice one issue though...
  14. M

    PCMofNC Swap - couple questions

    Ah okay. I thought that was the procedure for VATS. If I need to run my original PCM, I don't have to do it again? Only on new to the vehicle PCMs?
  15. M

    PCMofNC Swap - couple questions

    Even with VATS disabled?
  16. M

    PCMofNC Swap - couple questions

    So excited to have this tune! That said, I ordered the 'core' model as I live in Canada and didn't want to mess with shipping back and forth. As such, I will be swapping the PCM myself. In doing so, I just wanted to make sure I am doing it correctly. I imagine it is as simple as it seems -...
  17. M

    What did you do to your GMT today? [Part II]

    Well, ordered my PCMofNC tune! Can't wait to get it installed (hopefully next week if it doesn't get stuck at the border)!
  18. M

    Weird... issue/function of blower motor?

    Ah, interesting, so it IS a function. Thanks!
  19. M

    Weird... issue/function of blower motor?

    On my 04 Envoy, I've noticed lately (since it's been warm and the A/C is AMAZING) that when I am running the A/C, the blower motor will seem 'loud' and then periodically drop in volume. The force of the air coming out the vents DOES NOT seem to drop off - it just gets quieter. It seems...
  20. M

    Front suspension questions (what to replace?)

    Thanks for all the advice - I will speak with my mechanic on Monday to get him to replace the control arms and ball joints at minimum. I looked at the control arms and the bushings are pretty worn. I don't know if I plan to keep this vehicle for long - I bought it as a work vehicle, but I...
  21. M

    Front suspension questions (what to replace?)

    My 04 Envoy SLT has about 290k KM on it. I have some service history, and it does NOT look like the suspension has EVER been touched, however, looking at the control arm bushings, they look to be in decent shape (no cracks, etc). I checked my ball joints, and both lower ball joints have...
  22. M

    AC problem - yet another electrical gremlin?

    Ah, good to know.
  23. M

    Vacuum at FPR?

    Ah interesting. So then is fuel pressure just static then?
  24. M

    AC problem - yet another electrical gremlin?

    Okay, kind of figured that was the case. It seems odd that the AC system does not work at lower temps - I always assumed that the AC works at lower temps to defrost the windows and stuff faster in the winter...
  25. M

    Vacuum at FPR?

    Just another odd question from me! On my 04 4.2L Envoy, I noticed that the fuel pressure regulator does NOT actually have a vacuum source on it. The line that connects from the regulator to the intake resonator does NOT show vacuum (I don't believe it would as it is before the throttle body)...
  26. M

    AC problem - yet another electrical gremlin?

    So today I have an update! I noticed the ambient temp reading +4... AC was working. Get back in after a short drive, ambient temp was reading -20... AC not working. I jumped the AC relay using a short wire, and the AC clutch engaged and worked flawlessly. So I am certain now it is the ambient...
  27. M

    AC problem - yet another electrical gremlin?

    You know, the ambient temp on the ATC was showing -1... I'll keep an eye on that.
  28. M

    AC problem - yet another electrical gremlin?

    I'm back with another (possible) electrical gremlin on my 04 4.2L Envoy. I noticed that my AC compressor was not working yesterday. I turned on and off the HVAC, turned on and off the AC, and nothing. I did notice that the clutch would engage when the engine first starts, but would stop after a...
  29. M

    4L60E questions

    Hey, so I forgot to respond to this post. Thanks for the information, there is a LOT to take in. That said, I have actually just finished a transmission cooler. I went with a 24,000GVW which is overkill, but it was actually physically only slightly larger than a 10,000GVW and the same price...
  30. M

    4L60E questions

    I have a few questions regarding the 4L60E in my 04 Envoy 4.2L. First of all, my shift times from an OBDII scanner - how do I use this data? For example, what are 'factory' shift times? In doing a short drive, I had a 0.40 1-2 shift; a 0.38 2-3 shift; and a 0.38 3-4 shift. Alongside those...

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