This is a continuing effort to get my newly aquired red 91 245 runing right. I got the car on ebay a few days ago from a Goodwill store in Indiana (200 miles from me). It has 230K verifyable miles. I first replaced a bad AMM (car will not stay idle after a few minutes of running). I can tell that it's running rich (slight popping from the exhaust). I first thought that the O2 sensor need to be replaced. After careful examining the sensor, it looks like it's good compared to a brand new one. As the car idles or runs, the O2 sensor output stays constant at ~0.5V. I checked the ECU and surprised to see that it has a 951 unit (looks like she already went through her original one). Upon replacing it with a known good 951, the O2 output signal immediately start to cycle between 0.1 and 0.85V. Also the idle speed came down closer to normal (0.9 compared to 1000 before the change). It idles and runs very smoothly now, only hope to get the idle down to close to 750 rpm.

I took the entire intake out this afternoon and scrub cleaned everything on that side. I'm pretty happy how far I already got with her. I'm sure one day I'll get the idle right. Thanks for reading. Erwin