This one still stumps me after several years. I also have a '92 300e with about the same number of miles (200K+)but it always starts up immediately. I can swap out the parts and haven't figured it out. The computer is different but everything else is pretty much the same.

I think the problem is in the fuel system since it starts up immediately when cold (the cold start injector helps).

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89 300te 222,222
92 300e 190,000