My father just gave me his '85 500SL. Shortly before he handed it over to me it started exhibiting problems starting once warm. In the past week we have replaced the fuel filter, pump, and accumulator. The problem still exists. We also swapped out the fuel pump relay...same results. I am inclined to believe it is fuel injectors leaking down. Is there a way to test this theory without taking the shotgun approach by replacing all of the injectors?

The car will always start but it is simply harder to start when warm. Any advice will be appreciated.

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Mike

'80 300D
'84 300D
'85 300D
'87 300D