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Why is my truck shaking?

Tiny
PIERCEDWOLF
  • MEMBER
  • 1996 GMC SIERRA
Ok, we were having problems starting our truck. We changed the starter, that did not fix it, we changed the fuel filter that didn't fix it. We changed the spark plugs and now it shakes horrible. Pls help.
Saturday, October 8th, 2011 AT 12:25 AM

9 Replies

Tiny
CARADIODOC
  • MECHANIC
  • 33,879 POSTS
Do you mean shaking while driving or the engine is vibrating when the truck is standing still? Why on earth would you suspect the starter as causing that? If the engine is vibrating when the truck is not moving, and it got worse after replacing the spark plugs, you have two or more of the spark plug wires mixed up.
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Saturday, October 8th, 2011 AT 1:07 AM
Tiny
RIVERMIKERAT
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Idling? Driving? Idling: Check timing and air filter. Check for vacuum leaks.
Driving: Probably wheel balance issue.
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Saturday, October 8th, 2011 AT 1:09 AM
Tiny
RIVERMIKERAT
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Answered in other thread. Timing probably if the engine is shaking. Vacuum leaks. Wheel balance if while driving.
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Saturday, October 8th, 2011 AT 1:09 AM
Tiny
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The truck was not shaking before. We were having issues starting the truck is why we changed the started.
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Saturday, October 8th, 2011 AT 1:14 AM
Tiny
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It is shaking while driving and at red lights.
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Saturday, October 8th, 2011 AT 1:15 AM
Tiny
RIVERMIKERAT
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While driving is most likely a wheel balance issue. While idling is most likely either timing, vacuum, or switched plug wires.
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Saturday, October 8th, 2011 AT 1:25 AM
Tiny
RIVERMIKERAT
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See my last answer.
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Saturday, October 8th, 2011 AT 1:25 AM
Tiny
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Ok thank you
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Saturday, October 8th, 2011 AT 1:29 AM
Tiny
MHPAUTOS
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At red light? Then may be you have crossed a few leads over, and you have a misfire, I would be checking this first.
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Saturday, October 8th, 2011 AT 1:55 AM

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