1999 500SL, 1988 SEC
If you read H.D.s threads over time you would see one where he developed a diagnostic tool to read various engine functions while driving. I mentioned that I thought that would be valuable information along with the readings of duty cycle, fd fuel pressures, and fuel relay voltage etc would be a great add to data On the cars operation. At that time I had the intention of making my own device just a little different from what H.D. Showed. Well I am partly there and am starting this thread to keep all of you informed. It has taken me so long just because I had to have someone cut the aluminum plate for the gauges to go in and other things had to be taken care of first. Right now all I have left to do is wire the thing to the proper places in the car which is still a big deal. I did install a new bung in the exhaust (other side from the one the car uses) and mounted a wide band oxygen sensor to it and ran the wires to this data reader inside the car so I could read the afu mixtures at different driving conditions. The other gauges as mentioned above are for electrical levels of varios things and the indicator lights are simply to let me know if things are getting power. This unit will not stay in the car but will have a plug where I can remove it when not being used. So far I think I have about $30 in this. This does not count the afu meter though. For the most part I assume I wont need it but if things seem wonky with the engine I can simply plug it in and have some information that should help me diagnose the problem. As I get going I will keep you posted of this progress.
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