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+1 on what Donmo says, this happened on my '87 cab and it turned out to be a nearly invisible break in the solders on the DME Unit. There are some excellent threads on how to find and repair this. I managed it which means its not that hard.
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Buck
'88 Coupe, '87 Cab,
'88 535i sold, '19 GLC 300 DD
Warren Hall, gone but not forgotten
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