2003 Buick Rendezvous Service Engine light on

2003 BUICK RENDEZVOUS
31,000 MILES • 6 CYL • 2WD • AUTOMATIC
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2003 Buick Rendezvous mileage 31,000. Service Engine light on. Car runs rough between 35-40 Miles per hour. Code reader says EGR Flow Low. Replaced EGR vacuum regulator and EGR valve with no luck. Lots of black smoke in exhaust when under hard acceleration. Service engine light used to be intermittent but now it's always on.
Oct 19, 2010 at 10:15 PM
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Your problem may be a failing mass air-flow sensor or possibly oxygen sensors. Try temporarily unplugging the primarily oxygen sensors and test drive the car. If your problem persists, the mass air-flow sensor probably needs to be replaced.
Oct 19, 2010 at 10:21 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.