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  1. Engine knock with stalls. Engine swap TB>Envoy

    02-09 Vortec 4.2L I-6 Engine and Drivetrain
    Let my oil get lower than I would like. 4.2 vortec in a 2008 GMC envoy. Sounds like rod berring knock and she drank 4 quarts plus honey. Drove it 3 miles and it stalled at every intersection. I also couldn't use drive, only 1,2,3 gears and then it would stall again slowing down/ stopping. I am...
  2. Vehicle stalls out when using left blinker??

    02-09 General Tech Q&A
    This was an issue I put up with a few months ago (by put up with, I mean I quit using my left blinker for awhile ??‍♂️) The issue started again just this morning. When turning on the left blinker the dash starts beeping like WWIII, Service Brake System appears on the dash, the “Brake” and ABS...
  3. 04 TrailBlazer EXT random stalling at stop lights

    I have an 04 trailblazer with the 4.2l, giving me absolute fits. For some reason, it randomly stalls at stop lights when the A/c or heat is all the way on. it usually acts like a slow stall, the RPMs drop way low, then quits, but then it starts right back up after i put it in neutral or park...
  4. [SOLVED] Stalling issues with 02 Envoy SLT

    The "How-To" and DIY Section
    It made me put solved up there? Not sure if that's correct. I have a 2002 GMC Envoy with a 4.2L motor with 143K on it. I recently started to smell gas coming from the right rear side of the truck, so I assumed it was the fuel filter. Then when I would come to a stop sign it'd feel like it was...
  5. '03 Envoy stalling out immediately after start-up

    Hello All, I bought my '03 Envoy SLE 4.2 I6 a few months ago and drove it over 1000 miles until one day it stalled on the road. It would start back up but then stall right away after 1 or 2 seconds. Of course CEL and no codes. The things I've looked at or done so far: Checked all fuses (both...
  6. 06 TB 4.2 stalling at low idle

    OEM Issues
    I have read many forums here, and nothing seems to help me, I have replaced the thermostat, ECT sensor, camshaft sensor, crankshaft sensor, fuel pump, and cleaned the throttle body. I am still stalling out once the engine is warm and I come to a stop. I am still having the same codes reading...
  7. [SOLVED] Stalling at Idle with A/C On

    OEM Issues
    OK, My 04 4.2L trailblazer has been stalling at Idle while stopped at a light Occasionally. I recently had it to the local GM Dealer and they recommended a fuel system cleaning, from the Fuel Rail, for which I have ordered parts for but haven’t come in yet. However the tech said that he had...
  8. Losing my mind over random stalling

    OEM Issues
    This is my first post although I have been a member for a while. I have a 2004 TB 4-wheel drive with the 4.2 . Roughly 145,000 miles. Over the last 2 weeks or so my TB has begun cutting out/ shutting down while driving at highway speeds and I have almost been in an accident twice because of...
  9. No power on hills, some power loss accelerating - Misc Codes

    OEM Issues
    I am thankful for all the folks in this forum, I have solved a few of my issues already and I am hoping with your help I can solve these last problems. Symptoms: It does not seem to matter cold or warm start, when I slightly press the gas pedal sometimes the engine will slightly stall then...
  10. 02 Trailblazer keeps stalling at idle and low speeds

    Hey guys, my 02 Trailblazer 4x4 I6 keeps stalling at idle and low speeds, especially with AC on. SOmetimes I have to hold brake and give it gas to keep it from dying, then sometimes it runs just fine. It has about 160k miles on her. There were no codes. I have taken the throttle body off and...
  11. Engine trying to stall, Low Oil pressure

    Ok, so yesterday I was waiting in line to pick up my daughter from school, had driven my '02 Envoy for about an hour previous with no problems, and out of the blue it starts coughing and sputtering, and eventually dies. Low Oil Pressure flashes. I start it up again, and for the duration of...
  12. Throttle body

    Need suggestions! I have cleaned throttle body and replaced camshaft sensor (it was throwing out code p0340) but it still shudders and stalls out, especially when braking or accelerating from a dead stop. Is the throttle body bad? Suggestions needed. I also reset the computer after cleaning the...
  13. [SOLVED] 2003 Envoy Severe Hesitation and Stalling

    just a note ...... i've solved a huge problem with my suv and it did alot of head scratching before i figured it out, here's what i did, i hope someone else finds it usefull..... Symptom: started out as intermittant loss of power then progressed over the weeks to hesitation and then sputtering...
  14. How to: Cleaning an I6 throttle body (video)

    Tools used: 1/4" ratchet wrench 1/4" drive 6" extension 1/4" drive 10mm socket 1/4" drive 8mm socket mini pick big pick (can use a small flathead screwdriver) toothbrush gloves (optional) rags can o' throttle body cleaner Procedure: A more detailed step by step can be found here remove...
  15. Frustrated!! Engine Stalls and SES light blink

    Hi, I have a 2004 Envoy 6 cyl. Every so often when I'm idling and a stop with the AC on the engine stalls. It starts right back up and everything is fine for a while. The engine also seems to be "bogged down" on these hot, humid days as well. I had it to a dealership 2 weeks ago and they...
  16. RPM dropping while driving at low speeds

    Hello, I am new to this site but I have an 04 TrailBlazer and when driving at low speeds my RPM drop and my car is at times stalling out. Has anyone had this issue? Does anyone know what may be causing it? This occurs more with the AC on. Thanks
  17. Stalling at Idle or Rough Idle - Read This First!

    OEM Issues
    If your (circa 2004) TrailBlazer/Envoy has 80-100k miles on the odo and your symptoms are stalling at idle or rough idle (stop lights, stop signs, parking lots, etc.) and you find yourself driving 'two-footed' to keep it from dying on you, then please read on. Based on past experiences with my...