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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 General Tech Q&A > General

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  #1  
Old 10-30-2018, 05:14 PM
ladytex70 ladytex70 is offline
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Join Date: Oct 2018
Posts: 6
New to the TB/Envoy world...

And it’s a learning curve...I picked up an ‘03 Envoy in August after being in the Jeep world for almost 10 years. This engine/tranny combo is a different animal from what I’m used to and I’ve noticed a few quirks that are new to me, such as the throttle response is smoother and the engine power is much stronger than the old inline 6 that my ‘98 Cherokee had. I did the normal change all the fluids/tune up that anyone should do when they get a used vehicle. I do have to replace the fan clutch because she’s throwing the code for it and I did have to replace the ignition coil on cylinder #1. I do have one question for all of you guys...recently I’ve noticed a humming/drone like noise with a slight vibration when I start her up..this started when I had to turn the heat on for the first time last week; sometimes this goes away after driving her for a few minutes. Any suggestions on where to start troubleshooting? I’m not afraid to bust up my manicure..uh I used to own a Jeep😁😁
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  #2  
Old 10-31-2018, 07:11 AM
astroracer astroracer is offline
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2008 GMC Envoy Denali
Carbon Black Metallic 5.3L V8 4X4
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Location: Mid-Michigan
Posts: 68
Welcome to the forum! Hope we can help you out.
As far as the noise is concerned have you put a test probe (AKA screwdriver) on the A/C compressor? Clutch may be going out.
Mark
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  #3  
Old 10-31-2018, 10:21 AM
Ponvoy Ponvoy is online now
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2004 GMC Envoy SLT XUV
Carbon Metallic 4.2L I6 2WD
Join Date: Sep 2018
Location: Houma, LA
Posts: 9
Could also be a bad motor mount. If its noticeable when you put it in drive or reverse then its a possible culprit.
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  #4  
Old 11-01-2018, 10:30 AM
ladytex70 ladytex70 is offline
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I really appreciate the help..a mechanic friend of mine is coming over this weekend to help troubleshoot this and y’all have given us some starting points. So far I love this vehicle..comfortable ride, decent gas mileage for its size and what seems like a good engine/tranny combo. My ‘98 Cherokee had 210k on her when she spun a bearing and started losing oil pressure..it was time to let her go after 8 years.
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  #5  
Old 11-07-2018, 10:55 PM
johnny loops johnny loops is offline
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2002 GMC Envoy SLT
Monterey Maroon Metallic 4.2L I6 4X4
Join Date: Oct 2016
Location: middletown, nj
Posts: 17
Bad motor mounts and maybe a bad transmission mount is most commonly cited in these threads. What I and others experience is vibration when in drive but sitting at a stop for the first few minutes on a cold startup (vehicle not driven for hours). Stops if taken out of gear and not noticeable when you drive away. Engine rpms rock solid steady. Why only under these conditions I have not heard why. I have 80k miles, and this started at least 2 yrs ago, maybe 3 or 4 the way times goes by. Only put 5k per year on this truck.
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Old 11-07-2018, 11:17 PM
Dcubed Dcubed is offline
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2008 GMC Envoy SLE
Red Jewel Tintcoat 4.2L I6 2WD
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Location: DFW
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My 2008 started making a noise like it was the alternator bearing, I was checking things over, grabbed the fan, and it was loose!! I could wiggle it. The waterpump bearing was so bad that it let the fan move. I was not even losing any water! Oh, and by the way, I just let go of my 1999 Jeep Cherokee. I imagine it will hang around Ft Wainwright Alaska for the rest of its life.
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  #7  
Old 11-08-2018, 11:31 AM
mesprime mesprime is offline
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2002 GMC Envoy SLT
Pewter Metallic 4.2L I6 2WD
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Location: Atlanta, GA
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I would advise replacing the idler pulley when you replace the fan clutch since you will have the belt off anyway. Those tend to go bad and can cause the vibration you mentioned.
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  #8  
Old 11-08-2018, 01:31 PM
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Linusridesred Linusridesred is offline
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2003 Chevy TrailBlazer LT EXT
Summit White 4.2L I6 2WD
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Location: Roseville, CA
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I agree. I had a bad pulley that made so much noise it would cause my knock sensor to throw a code. Very easy to change and not expensive.
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  #9  
Old 11-15-2018, 09:38 PM
ladytex70 ladytex70 is offline
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Update: Evening everyone..figured I let y’all know how things are going. Turns out it is the fan clutch that is causing the noise that I’ve been hearing..so it’s time to order the part and get this changed out. Her motor/tranny mounts are in great shape and the a/c system is solid. My Envoy only has 134k on her motor, which is a nice change from the 210k that my Cherokee had on her when I sold it to a mechanic friend of mine. It’s also nice to have heat after not having it for 5 years thanks to a bad heater core in the Jeep..as much as I loved my old cranky brat the Envoy is definitely an upgrade; the only options I don’t have is the sunroof, leather seats and the V-8; which is fine with me. I plan on upgrading the sound system..I miss my Bluetooth system that I added to the Jeep. I would love to see if it’s possible to use the Onstar set up for the Bluetooth mic. Really appreciate the troubleshooting suggestions and look forward to any more info/suggestions that everyone has for the TB/Envoy.
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  #10  
Old 11-21-2018, 03:39 PM
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vipergg vipergg is offline
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2008 Isuzu Ascender
Midnight Metallic 4.2L I6 2WD
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If upgrading the sound system do the speakers too . They used cheap $10 chinese speakers in the standard radio and they will eventually fail . Had to replace all 4 in mine .
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