1987 420sel 120,000 miles. Difficulty starting after the car has been driven and warm. Let the car sit after its been driven and it cranks forever (15sec) before it starts. When the car is cold it starts better but not perfectly. The supply line to the distributor is producing enough volume. Please tell me it's a simple, yet more importantly, a cheap repair! Should I replace the fuel relay? It's not the ignition coil.

It sounds like the car is not holding fuel pressure at rest. It could be the fuel pump check valve,injectors or the fuel distributor. Try having the problem diagnosed to avoid needless expense.

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W.R.Durrance
ASE Master Tech
Mercedes Tech 19 Years