04 4.2 engine vibration - 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 05-14-2012, 12:27 PM
Morrisj Morrisj is offline
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2004 Chevy TrailBlazer LS EXT
Green 4.2L I6 2WD
Join Date: May 2012
Location: Louisiana
Posts: 5
04 4.2 engine vibration

Need a little help, the engine vibration is driving me crazy, it's most noticeable at idle to 1500rpm, you can feel it in the seat and has trim pieces rattling. I have changed the motor mounts, and water pump they both helped but just a little, fan clutch doesn't have any slack in it, was thinking mabe the balancer. I also have new plugs, and cleaned the throttle body, and it runs fine. Also after I changed the water pump I have noticed occasionally there will be bubbling in the resivoir, it never looses water or runs hot or warm even and only does it when I turn it off. Thanks in advance

04 trailblazer ext, 4.2 165k
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  #2  
Old 05-14-2012, 02:57 PM
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cliffordhenline cliffordhenline is offline
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2003 GMC Envoy SLE XL
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What kinda motor mounts did you use cus the factories are hydraulic and are the only recomended ones to use... qftermarkets just dobt cut it
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  #3  
Old 05-14-2012, 03:10 PM
Morrisj Morrisj is offline
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2004 Chevy TrailBlazer LS EXT
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I think they were anchor got them from rock auto
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  #4  
Old 05-14-2012, 03:23 PM
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cliffordhenline cliffordhenline is offline
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2003 GMC Envoy SLE XL
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Yep there have been alot of people haveing probs with those
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  #5  
Old 05-14-2012, 04:16 PM
Morrisj Morrisj is offline
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2004 Chevy TrailBlazer LS EXT
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Thanks I'll check into getting the hydronic ones
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  #6  
Old 05-22-2012, 11:48 AM
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SHILOW SHILOW is offline
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2003 Chevy TrailBlazer LTZ
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Quote:
Originally Posted by Morrisj View Post
Thanks I'll check into getting the hydronic ones
Buy the mounts from the dealer.
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  #7  
Old 11-28-2012, 07:15 PM
Morrisj Morrisj is offline
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2004 Chevy TrailBlazer LS EXT
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Well I finally got around to changing the mounts, bought a set from the dealer and wow what a difference it's like new again, the aftermarket mounts were definitely the problem they were terrible from day one, they have been on for six months and the passanger side was collapsed about a half inch thanks for the help on this now the wife will get off my back about it.
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  #8  
Old 12-03-2012, 12:53 PM
jsinga jsinga is offline
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2003 GMC Envoy SLE XL
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Glad to hear you got rid of your problem!
Did you notice the vibration worse in forward and not in reverse. Our 03 Envoy has buzzing vibration at low speed and sitting still until it runs a while and warms up. But it is completely quite in reverse. I think the motor mount is the problem. Has anyone changed motor mounts and can comment on what a bad one looks like?

Thanks,

JS
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  #9  
Old 12-06-2012, 08:09 PM
Traill--Blazing Traill--Blazing is offline
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Quote:
Originally Posted by jsinga View Post
Glad to hear you got rid of your problem!
Did you notice the vibration worse in forward and not in reverse. Our 03 Envoy has buzzing vibration at low speed and sitting still until it runs a while and warms up. But it is completely quite in reverse. I think the motor mount is the problem. Has anyone changed motor mounts and can comment on what a bad one looks like?

Thanks,

JS
A bad motor mount sometimes will make a rattle noise on the inside, shake it and listen. Most of the time you cant tell. After a certain amount of time the rubber wears out and causes the engine to drop 3/4 inches and starts to rub on the bracket which is what causes the vibration. It causes a bad ground were when you turn on the heater/AC the vibration will sound even worse, when you start the car you will feel the engine jump, even when turning it off, when you change the shifter from Park-reverse-drive-neutral you'll realize a different vibration why,cause the engine rotates different directions when you change the shifter. Do not use any jobber mounts, I did this and everything that I read on this site about them is true. There horrible, feels worse then before. You could only use the genuine ones from the GM dealer. I changed mines even the Transmission Mount and It feels like a brand new truck. Good Luck....
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  #10  
Old 12-06-2012, 08:32 PM
Morrisj Morrisj is offline
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2004 Chevy TrailBlazer LS EXT
Green 4.2L I6 2WD
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Location: Louisiana
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On ours it did seem to be worse in drive than reverse, the original mounts had oil on the passanger side mount, then I made the mistake of changing them with aftermarket mounts I believe those were worse than the bad ones that were on it, it took me a few months to get around to putting GM mounts back on it ,when I pulled the aftermarket ones off the passanger side mount was collapsed I could actually tell it was collapsed from looking at it from the top side of the engine, but both times I changed them it was the passanger side mount that showed the most wear, don't waste your time or money on aftermarket ones you have to buy them from GM I picked mine up from the dealer for $70 each I got a good deal on them I think they list for $100 each
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