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Chevy S10 - GMC S15 and Sonoma Vibrations

35 messages,  Last post on Aug 16, 2009 at 8:26 AM

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#33 of 35 rough shake. by py072888 Jun 15, 2009 (8:43 pm)
Grandfather has a 94 GMC Sonoma. 4.3L vortec. We rebuilt the motor about a year and a half ago. it had spun a bearing and we bought it that way. Replaced the crank and had rods cut and new bearings all around. New knock sensor. Lately he noticed that at low RPM's the motor shakes pretty rough. plug on knock sensor was broke so i replaced it. same problem. this motor has a balance shaft in it and i fear it is something to do with that. any ideas are greatly appreciated. if more info is needed please let me know. once highway speed is reached shake goes away as long as you are on throttle. if pedal is in only a little shake is at its worst. i believe timing is good. 12 degrees one way or the other i dont remember. will check it again tomorrow. is my timing off? what should it be? truck still has plenty of power. blows smoke and smells real rich. please help.
#34 of 35 More of a grinding then vibration by fatal22 Aug 08, 2009 (11:02 am)
I have a 98 s10. Its a 4 cy. 2.2 liter 5 speed. When I am driving 45 mph or above there is a horrible grinding noise coming from the passenger side. It stops when I let off the gas, and starts back up as soon as I put my foot back down. As of now, there is a 3 in drop on the truck which I am having removed because there are 17 in rims on it. There is no grinding when I brake. Also, if this helps at all, if I have my hand on the stick you can feel the vibrations of the grinding.
#35 of 35 Re: shever me timbers [aeunice] by fekj68 Aug 16, 2009 (8:26 am)
Replying to: aeunice (Oct 20, 2008 12:22 pm) I had a vibration problem on my 1998 S10 and it turned out to be the driveshafts. After replacing the U-joints I still had a bad vibration at certain speeds. Had to take it to a driveshaft repair shop and have the tubes replaced for $220. Now it drives smooth.

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