New thread, but an old problem. My '86 560SL has developed a warm start problem...after sitting for 30 minutes to a couple of hours, especially in the heat (routinely above 100 here for the last month or two) the car starts but it won't 'go'. It will chug roughly at idle, but if I try to give it gas it just doesn't go and if I don't let off the gas it will stall. After a few minutes, it starts running normally and then runs great. Drove it to Tulsa and back this weekend and it ran great on the highway.

Replaced the fuel accumulator to no avail, so I checked fuel pressures tonight and they are all within specs - engine cold and running 6.4 bar, lower chamber about 6.1. Pressure drops to 3.5 bar when I shut off the car. I have left the gauge on to check any leaking off of fuel pressure and after approximately 2 hours, gauge still reads 3.1 bar (FSM indicates that pressure should remain above 3 bar for 30 minutes after shutting off the engine).

So, I am more confused now. Anyone have any ideas?

ryan

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RG Newell

1984 300D
1972 250
1986 560SL
1991 300CE