It does have an egr valve follow this link for the position
Thread Replacing the EGR valve
SOURCE: need buick century egr diagram
If your car runs bad with an EGR code then I would suggest that the EGR valve be replaced. I would like to know what code was set on your computer. It would help greatly. When the EGR malfunctions, you will have rough idle and possible stalling. If you have a code indicating EGR it may also condem the cat converter.Please show any codes that are set. Thanks Moe
SOURCE: Where is the flasher unit located on a 1986 Buick Century?
it still could be kinda behind ashtray area. if i remember correctly, just left of ashtray attached to small bracket. real bugger to get to
SOURCE: 1996 buick century, I had a tune up and egr valve
Have an auto parts store check for the code. It is possible that you have a bad O2 sensor or your catalytic converter is clogged.
SOURCE: 1993 buick century 3.3 transmission modulator help
it is located on the side of the transmission case, it has a vacuum hose going to it, make sure that hose is good and has vacuum from the engine going to the modulator, here is a picture of the modulator so u can ID it.
Testimonial: "thanks for all of your help hopefully this it it seems wierd the photo you gave me not really the same as what i have found but it is close "
SOURCE: fuel guage fluculates on my
this is a very common problem with this vehicle, they have redesigned the fuel level sensor for it. Unfortunately the sensor is located inside of the fuel tank attached to the fuel pump, you will have to remove the fuel pump from inside of the tank and replace the sensor which will require you to drain and remove the fuel tank first, or take it to a repair facility
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