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  #1  
Old 04-06-2011, 12:29 PM
bakerblazer bakerblazer is offline
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2004 Trailblazer vibration issue

I have a 2004 Trailblazer that has started having a vibration throughout the vehicle while at idle such as a stop light or parking lot. If the transmission is in neutral the vibration will stop but immediately is back once in gear again. Vibration is gone as soon as rolling forward or applying accelerator. Could this be torque convertor?
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  #2  
Old 04-06-2011, 12:43 PM
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EwingJK EwingJK is offline
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There are numerous threads regarding this issue. The problem is collapsed motor mounts. You can find the threads using the search function.
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Old 04-06-2011, 02:32 PM
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Happened to me, and I was in denial for many, many months.
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Old 04-06-2011, 03:43 PM
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EwingJK EwingJK is offline
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Happened to me, and I was in denial for many, many months.
I started having this problem about two months ago. I bought the replacement mounts, but changing them out is not an easy task in the parking garage at the condo. Access to the top stud on the driver's side is hindered by the engine wiring harness bracket and PCM (#5 in the diagram). Turning the socket ratchet is nearly impossible in the small space provided. I'm going to take it to my brother-in-laws in the next week or so and try to get the mount nuts with pneumatic tools.

http://www.compnine.com/index.php?u=1&year=2005&artnbr=TS03-224&artsfx=NULL&supplgroup=NULL&catcode=56S&modelc ode=T&makecode=LC&modelseries=NULL&uid=1&modelid=7 156&capuid=1&majorgroup=03&grouptype=B
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Old 04-06-2011, 07:09 PM
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Quote:
Originally Posted by bakerblazer View Post
I have a 2004 Trailblazer that has started having a vibration throughout the vehicle while at idle such as a stop light or parking lot. If the transmission is in neutral the vibration will stop but immediately is back once in gear again. Vibration is gone as soon as rolling forward or applying accelerator. Could this be torque convertor?
Not sure if I have the exact same problem. For me the vibration happens either in our out of gear. It also is not constant. Some days it does it and other it does not.

Are you guys sure that it's the engine mounts even if I am at idle in neutral? If i could just get a confimation from someone that they have the same problem as me and have changed the mounts to fix it then I would jump on it. Roadie, yes I guess I am procrastinating like you. I suppose being at 110K my ride being an '05 I should just go for it and change the mounts. But being a father of a one year old makes it kind of a hard choice since I am the babysitter during my free time and we are tight for cash. I don't want to be changing parts nilly-willy.
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Old 04-06-2011, 07:23 PM
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If it comes and goes and isn't correlated with temperature (stops vibrating when warm), and if it happens in neutral, then it's probably not motor mounts.

A motor mount vibration is 10 Hz. Won't ever appear in the tachometer.
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Old 04-06-2011, 09:32 PM
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Originally Posted by the roadie View Post
If it comes and goes and isn't correlated with temperature (stops vibrating when warm), and if it happens in neutral, then it's probably not motor mounts.

A motor mount vibration is 10 Hz. Won't ever appear in the tachometer.
What I feel is a wavy back and forth motion at idle or it could be front to back IDK. Sort of like being in a big rig sitting in those air shock seats. I would say the sensation I feel is around 2Hz when a hertz is one cycle per second. When the problem occurs you can also hear at the exhaust a warbling tone to it (ever so slight). It makes an up and down tone like there is an idle problem/starving for gas. However I don't see my tach move at all (as you said). temperature makes no difference as you said. Kind of ruled out vacuum leak because it happens off and on. Very strange indeed. So everyhting leads me to think it the motor mounts but being that it happens in neutral has me concerned. The fuel sender was worked on and the thermostat replaced within a year. That is all the major maintenance outside of a full tuneup that I know of. Sorry to hijack this thread but thought my circumstances needed to come up and hopefully help someone out down the road. I am out. Thanks!
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Old 04-13-2011, 02:09 AM
MOZTANG MOZTANG is offline
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Originally Posted by Ralph_T View Post
What I feel is a wavy back and forth motion at idle or it could be front to back IDK. Sort of like being in a big rig sitting in those air shock seats. I would say the sensation I feel is around 2Hz when a hertz is one cycle per second. When the problem occurs you can also hear at the exhaust a warbling tone to it (ever so slight). It makes an up and down tone like there is an idle problem/starving for gas. However I don't see my tach move at all (as you said). temperature makes no difference as you said. Kind of ruled out vacuum leak because it happens off and on. Very strange indeed. So everyhting leads me to think it the motor mounts but being that it happens in neutral has me concerned. The fuel sender was worked on and the thermostat replaced within a year. That is all the major maintenance outside of a full tuneup that I know of. Sorry to hijack this thread but thought my circumstances needed to come up and hopefully help someone out down the road. I am out. Thanks!
Hey Ralph, you were quite involved in my other posts so Id figure I would chime in. Although I doubt this is the problem, I had similar vibration/rumbling at idle in my truck. My problem was that the fan shroud wasn't seated properly after replacing my fan clutch. It seemed like I had a heavy idle and at WOT my whole cab would shake. This happened to me a few times when I kept taking the fan on and off frequently, but the cab vibrating only happened on one of those occurrences. It's a long shot but it may be worth looking into considering how rough replacing the motor mounts are.
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Old 04-13-2011, 09:17 PM
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Quote:
Originally Posted by MOZTANG View Post
Hey Ralph, you were quite involved in my other posts so Id figure I would chime in. Although I doubt this is the problem, I had similar vibration/rumbling at idle in my truck. My problem was that the fan shroud wasn't seated properly after replacing my fan clutch. It seemed like I had a heavy idle and at WOT my whole cab would shake. This happened to me a few times when I kept taking the fan on and off frequently, but the cab vibrating only happened on one of those occurrences. It's a long shot but it may be worth looking into considering how rough replacing the motor mounts are.
I think I have narrowed down the issue. The vibration is worse when the engine is hot > 170F. I ordered a new AC Delco upstream O2 sensor and it will be here this afternoon. Will report back what I find. Xfingers. This is about as far as I am going replacing parts ad-hoc without a CEL.
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Old 04-18-2011, 12:11 AM
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Ralph_T Ralph_T is offline
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Quote:
Originally Posted by Ralph_T View Post
I think I have narrowed down the issue. The vibration is worse when the engine is hot > 170F. I ordered a new AC Delco upstream O2 sensor and it will be here this afternoon. Will report back what I find. Xfingers. This is about as far as I am going replacing parts ad-hoc without a CEL.
Installed the new O2 sensor today and filled up with gas and some techron again. Took the voy out on the highway for a 80 mile trip and had some interesting results.

First thing I noticed during the first half of the trip is that the pinging problem under medium acceleration was just as bad if not worse. I also noticed a decrease in vibration while the vehicle was warm. After coming back home I could barely percieve the vibration and pinging. Can this all be because I changed the O2 sensor? Huh, well I am happy.

One other thing I noticed while changing the O2 sensor was that I got a good view of the engine mount on the passenger side. It looks to be pancaked down to the thickness of a large donut and does not resemble the tall looking mounts you see in the pictures when purchased new. It also does not look anything like the right driver side mount which looks brand new. I am guessing the passenger mount is bad. Perhaps the slight imbalance created with the bad O2 sensor was amplified by the fact that I have a bad mount. Going to change the passenger side mount and will report back.
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