Originally Posted by hbofinger

Hi,

I got a 1989 560SEL that is rough on warm start after standing for 10 minutes or so. Cold start is fine. The start itself is fine, it just that the engine vibrates as if not running on all eight. Some addition background:

• Accumulator - New
• Fuel flow check valves at pumps - New
• EHA - new
• Injectors & holders & seals - did those about 10 years ago
• Fuel filter - new
• Idle after cold start - perfect! Smooooooth.....
• idle after a minute or so after warm start - perferct! Smoooooth!

However, even if I press the gas pedal after a warm start the engine vibrates as it picks up rpm. The overall vibration settles down after a minute or so.

A good friend of mine suspects the injector seals. Any other ideas?

Mileage 128k (Love the car!)