Deep Vibration at idle on 2003 TB - 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

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 12-29-2009, 07:56 PM
cptmedic cptmedic is offline
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2003 Chevy Trailblazer
Silver 4.2L I6 2WD
Join Date: Apr 2009
Location: Alabama
Posts: 5
Deep Vibration at idle on 2003 TB

I have a deep vibration at idle and in gear. When I place it in neutral or park the vibration used to go away. Now it is there but not as bad as when in gear. When I accelerate it goes away. I have cleaned the throttle body. It is not that type of vibration. I have had two shops check it. The shop its in now is about to check the cam shaft pulley. They also replaced two motor mounts which did not stop the vibration. They did say something about the exhaust being tight. Any guesses or suggestions?
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  #2  
Old 12-29-2009, 08:28 PM
the roadie's Avatar
the roadie the roadie is offline
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2004 GMC Envoy SLT "Roadiemobile"
Extreme Offroad Pewter 4.2L I6 4X4
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I've got the same thing, and haven't changed anything yet like motor mounts, but my throttle body is clean. I seem to recall some folks have gotten relief with a cam position sensor or a cam position actuator swap. Neutral or reverse, sitting still at a light, is OK. In gear and it rumbles like it's a semi truck.

But not an erratic idle where it goes up and down 50-100 RPM. Much higher frequency, like 10 Hz.

I bought a cam sensor as a cheap first experiment.
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  #3  
Old 12-29-2009, 08:38 PM
cptmedic cptmedic is offline
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2003 Chevy Trailblazer
Silver 4.2L I6 2WD
Join Date: Apr 2009
Location: Alabama
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Cam Sensor

How hard is that to install? How much?
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  #4  
Old 12-29-2009, 09:39 PM
skoehlke skoehlke is offline
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2002 Chevy TrailBlazer LT
Graphite Metallic 4.2L I6 2WD
Join Date: Feb 2009
Location: Atlanta, GA
Posts: 150
Vibration

I have a very similar problem. I have not been able to resolve my vibration issue either.

I was wondering if the shop replaced your motor mounts with OEM ones? Apparently the aftermarket products are not reccomended by other trailvoy members. There are several links on this site about how poor the aftermarket products are.

I have not replaced my Camshaft Actuator yet, that is next on the list. I am also contemplating a pre-cat O2 sensor.
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  #5  
Old 12-30-2009, 10:00 PM
skoehlke skoehlke is offline
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2002 Chevy TrailBlazer LT
Graphite Metallic 4.2L I6 2WD
Join Date: Feb 2009
Location: Atlanta, GA
Posts: 150
Update

The wife drives the car on a daily basis. She said that the vibration has been minimal the last few days. It is somewhat cool here in ATL. I have also noticed that the vibration tends to get worse when the temperature gets warmer. Mostly when it is 50 or more.

How weird is that?
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  #6  
Old 01-04-2010, 10:08 AM
cptmedic cptmedic is offline
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2003 Chevy Trailblazer
Silver 4.2L I6 2WD
Join Date: Apr 2009
Location: Alabama
Posts: 5
Vibration Update

Well, still no relief. Replaced the crank shaft sensor, had cam shaft pulley checked...throttle body cleaned;they have been through it from one end to the other. The only thing I have not done is replace the cam shaft sensor. Motor mounts were OEM. Driving with vibration uuuuughhhhh!
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  #7  
Old 01-04-2010, 11:17 AM
03trailb 03trailb is offline
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2003 Chevy TrailBlazer LT
Sand Beige Metallic 4.2L I6 4X4
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Location: canada
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I am currently going through the same thing with my 03. keep us updated with any progress, thanks.
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  #8  
Old 01-04-2010, 11:43 AM
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Robert1101 Robert1101 is offline
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2003 Chevy TrailBlazer LS
Majestic Red Metallic 4.2L I6 4X4
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Quote:
Originally Posted by cptmedic View Post
I have a deep vibration at idle and in gear. When I place it in neutral or park the vibration used to go away. Now it is there but not as bad as when in gear. When I accelerate it goes away. I have cleaned the throttle body. It is not that type of vibration. I have had two shops check it. The shop its in now is about to check the cam shaft pulley. They also replaced two motor mounts which did not stop the vibration. They did say something about the exhaust being tight. Any guesses or suggestions?
Is the vibration still there when you remove the serpentine belt? DO NOT drive it with the belt off.
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Earth first, we will strip mine the other planets later 3.73's, G80, 4X4, PCMforLess, Flowmaster 70, K&N 57
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  #9  
Old 01-04-2010, 04:15 PM
03trailb 03trailb is offline
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2003 Chevy TrailBlazer LT
Sand Beige Metallic 4.2L I6 4X4
Join Date: Jan 2010
Location: canada
Posts: 11
Ok, I changed the spark plugs, cleaned the throttle body which was filthy, and installed a new fuel filter (old one was pretty plugged) and I am still experiencing this vibration. Is there any way an exhaust leak at the manifold cause this? Thanks.
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  #10  
Old 01-04-2010, 11:27 PM
Kwhite Kwhite is offline
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2003 GMC Envoy SLE
Midnight Blue Metallic 4.2L I6 2WD
Join Date: Mar 2009
Location: Fort Lauderdale, FL
Posts: 9
vibration

Hi Guys,

I have the same issue on m '03 Envoy (118,000+ miles); vibration while I'm in gear while stopped with my foot on the break. There is not a vibration when in nuetral or moving faster than 5 mph. I've cleaned the throttle body, just had a rebuilt transmission put in (vibration was there before transmission change), one mechanic said "old cars do that" another said he would have to spend a day with the Envoy to try to figure it out. My next stop is the dealer!

A couple threads are on this sight and people said they had broken transmissin mounts or pepples in the transmission mounts. Any new solutions or ideas I would love to hear about it.

Kevin
Fort Lauderdale
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