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Car shaking

Tiny
TINA HARRIS
  • MEMBER
  • 2003 BUICK LESABRE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 187,900 MILES
I the changed the plugs, wires, and coil pack. I checked engine light flashing on and off. Reading a PO300 code, Random misfire code?
Tuesday, May 17th, 2016 AT 9:40 AM

4 Replies

Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
Okay. Was it doing the misfiring before you changed the parts?
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Tuesday, May 17th, 2016 AT 10:03 AM
Tiny
TINA HARRIS
  • MEMBER
  • 3 POSTS
No, it was running fine. Then one morning it heard a squeaking sound and it started to shake and the check engine light started flashing.
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Tuesday, May 17th, 2016 AT 12:50 PM
Tiny
TINA HARRIS
  • MEMBER
  • 3 POSTS
I am sorry, yes it was misfiring before we changed the parts.
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Tuesday, May 17th, 2016 AT 12:51 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
Hi Tina,

Does it misfire under power if so, then I would check the compression to see if all cylinders are okay it could be an injector,

here are two links that can help you

https://www.2carpros.com/articles/how-to-test-engine-compression

and

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

let me know what you find

Best, Ken

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Saturday, May 21st, 2016 AT 1:10 PM

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