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  #1  
Old 04-24-2003, 10:50 PM
agood's Avatar
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What is this?

Round thing with electrical connections mounted on the driver's side fenderwell, under the hood.
Thanks
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What is this?-mvc-821s.jpg  
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  #2  
Old 04-24-2003, 11:00 PM
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that's the diagnostic port

xp
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  #3  
Old 04-24-2003, 11:08 PM
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If you're talking about your '83 SD, I beg to differ with xp190. There is no diagnostic hook-up on your car car. The part in question is the "tach amp". If you remove it, the tachometer won't work. If the tachometer doesn't work, that part is a common cause for this problem.
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  #4  
Old 04-25-2003, 10:14 AM
agood's Avatar
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Yes, this is from the 83 300sd.....
How can there be a diagnostic port when here is no ECM?
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1994 E320
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1990 300 SEL
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  #5  
Old 04-26-2003, 10:17 AM
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sorry I was only going on what I know about my car

xp
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  #6  
Old 04-26-2003, 01:55 PM
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It diagnoses RPM.
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  #7  
Old 04-26-2003, 10:59 PM
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yep in my old 300SD this little jimmy came loose a few times and I had to tighten her back up to get my tach going.
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