Deep Vibration at idle on 2003 TB - Page 4 - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

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Old 02-19-2010, 09:21 AM
ibidu1 ibidu1 is offline
Envoy Trailblazer GMC Envoy SLT
Black 4.2L I6 2WD
Join Date: May 2009
Location: Tampa FL
Posts: 410
Originally Posted by apcapt View Post
Throw me in this pile also. It's currently in the 50's here in South FL. and the vibration is driving us nuts. Checking for rocks and tranny mount this morning.

You wont find rocks in South Florida, maybe mangos
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Old 02-24-2010, 08:30 PM
Kwhite Kwhite is offline
Junior Member
2003 GMC Envoy SLE
Midnight Blue Metallic 4.2L I6 2WD
Join Date: Mar 2009
Location: Fort Lauderdale, FL
Posts: 9
Deep Vibration solved

Solved my vibration at idle today by replacing both motor mounts. Took the Envoy to the shop that normally works on her and they believed motor mounts were the problem. Of course I was concerned they would do the work, charge me and that wouldn't fix the problem as another mechanic told me the mounts looked OK because the engine wasn't moving around during rev up with foot on the break. The shop replaced with two GM mounts ($96 x 2) and for two hours of labor @ $65/hr. Runs smooth as can be The $130 of labor was well worth not having to spend my Saturday turning a wrench! The mechanic showed me the old mounts - you would never know they were bad by looking at them, but he did say the new mounts were about an inch taller than the old ones and they really don't break (1st mechanic was looking for broken mounts), but compress over time and become ineffective.
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Old 02-25-2010, 08:47 PM
tblazed's Avatar
tblazed tblazed is offline
Basic Vendor- DRL Killer
2002 Chevy TrailBlazer LS
Summit White 4.2L I6 2WD
Join Date: Sep 2004
Location: DFW - The Republic of Texas
Posts: 2,212
Originally Posted by coolcloo1019 View Post
Another thing I forgot to mention about this issue. If I am at a stop and it is vibrating, it will also go away if I give it a little gas while still at a stop (almost like power braking) but just enough to get the RPM up a little higher.
This is why I had my idle speed adjusted up 20 RPM from the stock idle speed setting of 613 to 633 RPM when I had my tune done. Took away a mechanical resonance in the drivetrain which would even make the steering wheel vibrate that was happening at the stock idle speed. Idles so smoothly now you can hardly tell it's running.
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Old 04-06-2010, 03:18 AM
cheeter6299 cheeter6299 is offline
Junior Member
2004 Chevy TrailBlazer LS EXT
Black 4.2L I6 2WD
Join Date: Nov 2008
Location: Alpharetta, GA
Posts: 4
Rumble / Shutter / Vibration when idle in Gear, not up to operation temperature....

I have been having this same issue for about a year now. I figured it was the torque converter, since the vibration/rumble goes away when in Neutral or Park. It progressively got a little worse during the winter, but I now realize that when the truck is FULLY warmed up (been running in traffic for 20+ mins and temp guage is dead middle about 210) ... the vibration is gone. It is almost as if, in my case, this problem is temperature related. I now let the truck warm up at least 5 mins before driving if it has been sitting overnight or for several hours... seems to help reduce the vibration sooner since the truck warms up to full operating temp more quickly. The Torque Converter was replaced under warranty around 43K (full fluid service then), truck now has 102K (vibration/shudder/rumble started around 88K). I had the tranny fluid services about 3k miles ago (filter and most of fluid, not all)... helped a little, but not much. They didn't find any metal shavings (other than the super fine stuff which you expect to see on the magnet in the pan) during the service. I also cleaned the throttle body. The Cam sensor issue does not apply (no oil leak around it). Plugs were replaced around 90K also. Also to note I have had the water pump replaced twice (so hopefully coolant is good and at proper mixture - 50/50). I had a mechanic friend mention the TCC solenoid, but my symptoms don't fit the posts in the those threads... ANY ideas? next stop transmission shop...
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Old 04-06-2010, 07:16 AM
skoehlke skoehlke is offline
2002 Chevy TrailBlazer LT
Graphite Metallic 4.2L I6 2WD
Join Date: Feb 2009
Location: Atlanta, GA
Posts: 150
Other ideas

Could be motor mounts. There are several references to bad motor mounts causing the vibration. Especially if it occurs in Drive, but goes away in Park and Neutral. I have the same issue and Motor Mounts (OEM replacements only) are my next item to replace.

You may also want to look at rocks in the transmission mount. That sometimes is a cause.
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Old 04-06-2010, 07:59 AM
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joemoto311 joemoto311 is offline
Senior Member
2004 GMC Envoy SLT
Carbon Metallic 4.2L I6 4X4
Join Date: Sep 2008
Location: Chesapeake, Va
Posts: 538
just a quick we read the entire thread before posting? just curious..............could be the motor mounts
I recommend replacing the flux capacitor once a year on the 02-04's
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Old 04-06-2010, 09:33 AM
mbergh mbergh is offline
Junior Member
2002 Olds Bravada
Pewter Metallic 4.2L I6 4X4
Join Date: May 2009
Location: Aurora, IL
Posts: 38
Motor mounts

The vibration on my Bravada was worse in the winte. The mounts compress and get harder in cold weather. As it has warmed up or the outside temp increases, the vibration is less. Replacing the mounts with OEM parts was the answer in my case. Maybe in yours too?
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Old 04-06-2010, 12:25 PM
iznit's Avatar
iznit iznit is offline
2002 Chevy TrailBlazer LS
Midnight Blue Metallic 4.2L I6 2WD
Join Date: Sep 2007
Location: Chula Vista, CA
Posts: 261
I had the same problem. It was my motor mounts. I ordered some new ones from gmpartsdirect and swapping them out stopped about 95% of the vibration while at a stop in drive.

I have a new transmission mount that should be delivered today so I'll swap it out after work and hopefully that will resolve the small amount of residual vibration left.
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Old 04-08-2010, 05:39 PM
bilihor bilihor is offline
Junior Member
2006 GMC Envoy SLT XL
Summit White 4.2L I6 2WD
Join Date: Nov 2009
Location: Canton, GA
Posts: 8
I will add my resolution. Had rough idle for a while, with mostly 300 code. Went to dealer and they "found" compression in cylinders 1 and 2 is less than on others. They had only one solution - replace head.
Went to a friend in local Big 10 Tires and explained to him exactly whats going on. Misfiring mostly when I stay on Drive at light or begin to drive.
he recommended to try and replace thermostat. According to him, engine is getting more gas to increase the temperature because thermostat is telling it is not warm/hot enough. This is causing a misfire on low rpm.
After replacing thermostat, everything back to normal. My 130K miles engine is quiet as new at 600 RPM idle and even MPG improved.
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Old 04-14-2010, 03:38 PM
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saranykm saranykm is offline
2005 Chevy TrailBlazer LS EXT
Superior Blue Metallic 4.2L I6 2WD
Join Date: Oct 2009
Location: san diego, ca
Posts: 255
i was gonig nuts yesterday....we had some decent rain here in san diego, so i decided to make a big splash behind the sonic burger....i get home, rinse the truck (while on) and shut it off....i get in the truck about hours later and i get that damn vibration while in a moving would come and go as it pleased....i dumped some fuel injector cleaner and filled up (needed it anyways) and it was still there, and drove me nuts....
thank god we have, i bet some rock is jammed up in the mount, although i did see other things on this link about a cam-position sensor... which i may change anyways only bucks at autozone and im going to clean the tbody again after the mobile 1 change on friday...i just hope there are rocks in the mount...that would make my life easier
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