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2003 Buick Century stumbles on acceleration

Tiny
BIKEWREK
  • MEMBER
  • 2003 BUICK CENTURY
  • 3.1L
  • V6
  • FWD
  • AUTOMATIC
  • 180,000 MILES
Just changed spark plugs, oil & fliter, trany & fliter, and the o2 sensor. Going down highway it will start to stumble on hard acceleration. Did not do it before
Friday, October 9th, 2015 AT 10:59 PM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check fuel pressure with a gauge auto parts rent it. Also clean throttle plate on both sides and iac hole with choke cleaner. I am assuming check engine light is not on. If it is scan for codes. Should be 52-59 psi key on only
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Saturday, October 10th, 2015 AT 6:17 AM
Tiny
THIS IS MIKE
  • MECHANIC
  • 686 POSTS
Bikewrek
10/12/2015

will try it. Thanks very much
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Monday, October 12th, 2015 AT 11:09 AM
Tiny
BBAASPENCER
  • MEMBER
  • 6 POSTS
Buick Century throttle position sensors are one of the most common things I replace when you have a mid-throttle hesitation. The check engine rarely comes on is why it's so hard for the average person to diagnose. The photo below is a 2003 Century with only 77k miles and the mid-range dip is due to a bad TPS. I used an Autotap program on a Dell laptop to catch it. Replacing the sensor instantly restored it to "like new" performance.
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Sunday, October 9th, 2016 AT 7:05 PM

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