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1999 Buick Century Custom 3.1L Poor Idle Quality
Posted to GM Driveability on 6/6/2008 14 Replies

I need some help with this Buick. Runs good, good power below about 2500 rpm and at part throttle. Above a certain throttle opening, or at about 2500 rpm, under load or in neutral, it starts a rythmic idle fluctuation and loss of power that continues until you...

14 Replies Received (View Replies)

  Related Documents & Media  1999 Buick Century Custom

 
Message Closed w/FIX

car Vehicle Data

1999 Buick Century Custom

VIN 2G4WS52M8X
Engine3.1 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI / SEFI
EmissionsOBD-II Compliant
SymptomsPoor Idle Quality
OccursAlways, at About 2500 RPM

Trouble Codes

P0449PCM Internal Fault
Message Closed w/FIX

car Vehicle Data

1999 Buick Century Custom

VIN 2G4WS52M8X
Engine3.1 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI / SEFI
EmissionsOBD-II Compliant
SymptomsPoor Idle Quality
OccursAlways, at About 2500 RPM

Trouble Codes

P0449PCM Internal Fault