Very bad vibration
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New User
Joined: Nov 2010
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Very bad vibration
Hope you guys can help. My truck is vibrating very bad. It doesn't do it while idling. It's worse at lower speeds. When given the smallest amount of gas it make a rattling noise. When I get up to speed it doesn't seem as bad but it's still there. It also seems to worsen when going up an incline or coasting down a decline. I've been told the torque converter or coil pack. Any suggestions?
Hotshot
Joined: Jul 2005
Posts: 11,931
Likes: 180
i vote for coil misfire. YOu dont have a code or light i assume... You should get one soon. Sometimes you can play with the throttle and make the miss worse, or jump in and out and that should eventually throw a code to tell you which COP.. Untill that time, your basically blind on which one to change out.
Laughing Gas
Joined: Oct 2003
Posts: 967
Likes: 0
From: DC
Agree with bad COP. You can get a new one and do a little trial and error by moving it from cylinder to cylinder 'til you find the problem. I think a good scanner (not code reader) will show you live data that will indicate the fault as it happens. You may also have a stored code that you can look at.
Elder User
Joined: Jan 2008
Posts: 973
Likes: 0
From: Gatineau, Quebec
First off... it would help if we knew what we were talking about.
Tell us what truck you drive....what engine? what year? transmission?
...all this comes into play.
Are we talking about an engine vibration or a driveline vibration.
A bad coil pack or COP would cause an engine vibration
a bad torque converter will cause a driveline vibration.
You'll have to post more before I go out on a limb and tell you to start replacing this or checking that.
Tell us what truck you drive....what engine? what year? transmission?
...all this comes into play.
Are we talking about an engine vibration or a driveline vibration.
A bad coil pack or COP would cause an engine vibration
a bad torque converter will cause a driveline vibration.
You'll have to post more before I go out on a limb and tell you to start replacing this or checking that.
Elder User
Joined: Jan 2008
Posts: 973
Likes: 0
From: Gatineau, Quebec
leaking around a seal does not mean your diff is shot.
Is there damage inside the diff
Perhaps the vibration is simply the result of bad u-joints. The leaking seal may or may not be a result.
Something told me you were talking about a driveline vibration though.
Is there damage inside the diff
Perhaps the vibration is simply the result of bad u-joints. The leaking seal may or may not be a result.
Something told me you were talking about a driveline vibration though.
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New User
Joined: Nov 2010
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also, we connected a code reader to the truck and it would not power on. the reader is good as we checked it on two other trucks. my CEL is not on but why would the code reader not come on? any ideas?
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Elder User
Joined: Jan 2008
Posts: 973
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From: Gatineau, Quebec
If the vibration is in the drivetrain, there will be no code.
It should still power up though and run check for codes and indicate that there is none.
I did see that happen once this summer when I went to check for codes on my uncles '04 chev truck down east. I just laughed and told him that GM was the problem.
But seriously, check out your U-joints! Crawling under the truck and trying to jiggle the shaft to see if you have movement is not enough usually. You usually have to remove the joint. If your shaft was shaking that bad, you likely would be wise to change them. Small price to pay for peace of mind.
It should still power up though and run check for codes and indicate that there is none.
I did see that happen once this summer when I went to check for codes on my uncles '04 chev truck down east. I just laughed and told him that GM was the problem.
But seriously, check out your U-joints! Crawling under the truck and trying to jiggle the shaft to see if you have movement is not enough usually. You usually have to remove the joint. If your shaft was shaking that bad, you likely would be wise to change them. Small price to pay for peace of mind.
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Freshman User
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I had a similar vibration on my 99 f150 supercaband i ended up changing tailshaft bushing in transfer case. I also had bad pinion bearings with no leaking around the seal, I also changed carrier bearings while I had it apart. Hope this helps took me almost a year to find it, everyone was telling me it was clutches in rearend that was causing my vibration.Bearing kit for 9.75 was about $200 and i done the work with a good friends help that is a mechanic at the school bus garage.
Lead Driver
Joined: Sep 2006
Posts: 7,907
Likes: 143
The code reader/scanner is normally powered from pin 17 off the data link connector.
Check for a bent pin or a pin push back.
Next check for a blown fuse that supplies the power to pin 17.
This fuse also supplies some other functions you may find missing if blown.
Good luck.
Check for a bent pin or a pin push back.
Next check for a blown fuse that supplies the power to pin 17.
This fuse also supplies some other functions you may find missing if blown.
Good luck.
Fleet Mechanic
Joined: Jul 2010
Posts: 1,354
Likes: 31
From: Winnipeg
If you have a drive-line vibration/growling noise and the front diff seal is leaking, it's possible the front pinion bearings are worn out. My experiences have been the smaller front pinion bearing.
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