2002 Buick Century egr valve

2002 BUICK CENTURY
128,000 MILES • 6 CYL • 2WD • AUTOMATIC
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CHARLES546
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i have had this car for 1 year.started getting bad fuel mileage.changed plugs and wires didnt help just kept getting worse and started haveing hessitation when accelerating.only does this after you drive amile or two when engine warms up.unplugged egr valve drove 50 miles car ran like anew car.plugged egr back up same problem again.put on another egr valve made no difference.what next.

thanks charles
Jan 29, 2010 at 2:51 PM
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SCOTTY DEE
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Has it been scanned for trouble codes?
Jan 29, 2010 at 6:45 PM
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CHARLES546
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yes scanned it had no codes.it only does it once it warms up.when cold runs perfect.

thanks charles
Jan 29, 2010 at 7:09 PM
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SCOTTY DEE
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Are you sure? When you unplugged the EGR a code would have been set. There could be an EGR cricuit issue, but with no codes......
Jan 29, 2010 at 7:15 PM
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CHARLES546
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yes it had acode after i unplugged it but cleared code and plugged back up.
Jan 29, 2010 at 7:20 PM
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SCOTTY DEE
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Did you go ahead and clean the EGR valve while it was off?
Jan 29, 2010 at 7:45 PM
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CHARLES546
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yes i sprayed real good with electronic cleaner but it really didnt have carbon buildup on it.donnt understand the vote proceder
Jan 29, 2010 at 8:04 PM
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SCOTTY DEE
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Did the pintle seem to have good spring to it? I'm sorry, give feedback casts votes.
Jan 29, 2010 at 8:14 PM
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SCOTTY DEE
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At this point I would want to drive the vehicle with a scan tool connected and read the live PID data, and see how the EGR valve if functioning in different speed and rpm ranges.
Jan 29, 2010 at 8:20 PM
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SCOTTY DEE
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Have you ever had the upper air intake and the lower fuel induction cleaned, and a new fuel filter?
Jan 29, 2010 at 8:24 PM
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CHARLES546
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no havent cleaned fuel system.when some of this snow melts iam going to unplig each sensor one at a time and see what that does.i am not a mechanic but if it runs great with egr unplugged doesnt seem like there is a problem with injectors or filter but you do this for a living so you should know. i am just lost on this.
Jan 30, 2010 at 11:59 AM