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I have had this problem on my 740 as well. It would start great first thing in the morning and again when I left work for home but if I happened to turn it off and needed to restart within a couple of hours, it may not turn over.
In my case, it turned out to be the wrong size battery. The one I picked up was just under the minimum cold cranking amps required. I only discovered this when I went to replace it after it failed to hold a charge. I had the problem on and off for ~4 years and numerous diagnostics. New battery with proper cranking amp rating and I haven't had a recurrence.
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1989 740GL (239K)
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