Riviera - Manuals & User Guides

Riviera Owners Manuals, User Guides, Instructional Help Documents & Information.


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I have 1991 Buick Riviera that I'm bringing back, the car is everything worked when I got a good place to start right. Will the computer went bad on it and blew up the water system, at point I'd already finished the suspension. I'm into the engine now I replaced the water system all new, Got a computer I was going to replace all major sensors. So I pulled the instrument cluster which was the only thing wrong with the car when I got it. I opened it and found someone had put electrical over the check engine light , it had never come on I thought the bulb might have been blown to. I sent while I did the engine work., it was suppose to be back before we were done. well that never happened. We wre finished when it arrived. I put it in and I get a check engine light, so I clear the codes start the engine no codes. You've got to drive the car awhile for the computer to start reading, this I did. While driving I got another check engine light I check for codes. it gives me 21,26,41. 21 is the throttle control sensor that been replaced already,26 is a quad driver and it's actually acomputer chip in the EMC,41 is the can sensor> So I replace the computer with a refurbished unit the last one was just out of a recycler pull codes again. All codes are gone, I take the car out put some miles on come back run codes thier all back. I've the position sensor with a meter it's within parameters. I have a recycled wiring harness ready to go on. But I need some help the way it is with code lights and all the damn thing is getting good gas mileage and runs like a bear.If you have an answer please send it thank you Rick
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