2003 Buick Century Sedan 3.1 from North America
My 2003 Century transmission was shifting slowly and engaged harshly when it did engage in gear. Flushed the ATF and had the filter changed. Seemed to work better after running 10 minutes.
I dropped the transaxle and replaced all four solenoids after being convinced that was the problem.
Transmission shops quoted 1600 to 2200 to fix, so I figured it out myself and replaced the parts. The car ran 50% better, but still had a few hard shifts and would not always start from a stop without some delay. But when warmed up was more reliable. Made me think that there could not be anything wrong with the transmission parts, because sometimes it worked flawlessly.
Tried a Luca's transmission treatment and it helped some more. Then I read on the Seafoam additive and after adding it, it cured the problem 100%. Why didn't I try that first. Dropping the transmission in the garage at home was no easy task. Glad that's behind me for good.
I love the Buick. It feels solid on the road and runs as you would want a car to.
Would you buy another car from this manufacturer? Don't Know
Review Date: 15th November, 2009