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Old 11-14-2020, 09:26 AM   #1
Tanman47
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Buick century 2000

Looking to buy a 2000 buick century from a buddy. Test drove it yesterday and had a bit of an issue. When I accelerated there would be a heavy vibration and it would worsen trying to go up a hill or accelerating heavily. It would also stop accelerating if I pushed it to the floor or pushing too hard going up a hill. No vibration when coasting or letting off accelerator. There was a code for o2 sensor and exhaust recirculation sensor/system. Haven't taken a look at it other than test driving and popping the hood. Don't mind trying to fix it myself but just trying to rule out if it's a major/ expensive part issue.
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Old 11-14-2020, 11:25 AM   #2
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Re: Buick century 2000

Welcome Aboard!

Since this is a Century, can we guess that the engine is the 207 CID (3.4L) Chevrolet V-6? That makes a bit of difference, since the Buick 231 CID (3.8L) would have a potentially different diagnosis.
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Old 02-08-2021, 04:40 AM   #3
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Re: Buick century 2000

My 2003 Buick century V6. 3.1 L is doing the same thing. Throwing code P0405. Don't know what to do about it!
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Old 02-08-2021, 06:40 PM   #4
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Re: Buick century 2000

Does this engine have the electronic EGR valve? It will have a multi-wire electrical connector on the EGR valve actuator instead of a vacuum line.
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