Vibration under load - 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 General Tech Q&A > General

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Old 01-13-2019, 07:08 PM
Olejbrown Olejbrown is offline
Junior Member
2006 Chevy TrailBlazer LT
Silver 4.2L I6 2WD
Join Date: Mar 2017
Location: Mooresville NC
Posts: 12
Vibration under load

So I have an 06 trailblazer with the 4.2 and besides it's usual little issues I got a couple I want to run past you guys. The first one is easy I believe my fan clutch is sticking. Here and there the fan runs at full tilt until you stop and idle for a second then it seems to run normally. The motor isn't getting hot and usually it's on the first drive of the day. Wanted to run this one past you guys and see if you agree and if there were any easy fixes. The new and strange problem as that in gear while not moving the engine has a deep low vibration. It doesn't sound unhealthy just like it's working harder than it should be or idling to low. It got new plugs, fuel pump, actually all kinds of stuff about two years ago so I don't think it's a simple tune up issue. If I put it in nuetral or park it idles up and it's fine. It's got about 165000 on it but that is not nearly long enough for an inline motor to be clapped out. When I replaced the intake gasket last year (vacuum leak) it did have some gunk but I don't think it was an abnormal amount. Still runs good, no loss of power, once it's warmed up and driven for an hour or so it doesn't seem to do it as much but I can still feel it.
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Old 01-13-2019, 11:22 PM
EnvoyBoy2004's Avatar
EnvoyBoy2004 EnvoyBoy2004 is offline
TrailVoy Alumni
2004 GMC Envoy SLT
Graphite Metallic 4.2L I6 4X4
Join Date: Sep 2014
Location: NY
Posts: 1,985
The vibration you are feeling is probably the motor mounts. This is a common symptom. When replacing them use only OEM parts, aftermarkets are junk.

As far as the fan clutch problem, it is probably time to replace it, and while you're at it, replace the water pump too. Hayden makes a pretty good fan clutch.
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Old 01-16-2019, 11:55 PM
johnny loops johnny loops is offline
Junior Member
2002 GMC Envoy SLT
Monterey Maroon Metallic 4.2L I6 4X4
Join Date: Oct 2016
Location: middletown, nj
Posts: 26
Same problems

I have similar vibration, and increased over time from just when cold. My honest mechanic says do not bother to replace until gets worse as it is not all that cheap. As to the fan clutch, mine got to a point where it threw the code for being engaged when not commanded by the PCM. And was almost always engaged. Replaced with Hayden, but still does engage when start moving after stopped, even in cold weather, so I suspect some sensors are off. However all else is fine and just living with it as have nothing to troubleshoot.
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