We are having a hard starting problem with our '96 E320. I starts OK when it's cold, but when it's warm we have to crank on it for a while, probably 20-30 seconds before it will start. If I re-start it within a couple minutes it will fire right up, longer then that I'm cranking on it again. There is plenty of power and the fuel mileage is fine. The Mass Air Sensor was replaced a few weeks ago due to stalling incidents, the problem started before that and seems to be unrelated since it is continuing. The battery is about 6 months old and I replaced the plugs last week. It always starts eventually, but it is kind of annoying that it doesn't just fire right up like it used to. Anyone else had this problem?

Thanks,
Doug

'80 300SD 152k
'96 E320 128k
'76 VW Westy ?43k
'87 BMW K100RS 100k

you need to find out if you are loosing fuel pressure when
you turn the engine off. this will cause this problem.

george

Thanks, I check that.

Fuel pressure reg ......just pull the vacuum hose off reg wait for few minutes see any gas come off fuel reg. if yes replace the pressure reg.

__________________
MB STARS Master Guild Technician,17 years MB tech
14 years independent shop owner

check thread, warm start problem e320 and change CPS and Crankshaft Reference Sensor,Worked like a charm for me!!!