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Old 03-12-2001, 09:07 PM
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Join Date: Jan 2001
Posts: 12
Thanks for looking!
I have an intermittent no-start problem with my new to me 93 300E 2.8. It has the later (I think) engine in it with no distributor, 3 coils, plugs and coils underneath cover in valve cover.

It will occasionally fire and die when cranked and then will not start for a while. Happens more often when warm or hot, but has happened when cold. Usually will start after a LONG crank if you press accelerator to the floor allowing more air in. When it starts this way it runs ROUGH for 5-10 seconds and gradually smooths out. Has never quit while running. When stopped at light, after about 5-10 seconds starts to vibrate a little, like idle is too low.

There is proper pressure on the fuel rail when it will not start, within 2-3 psi of normal operating pressure.

Thanks for any suggestions where to look. Can't find anything in the MB CD-ROM manual.


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Old 03-12-2001, 09:25 PM
J.HIDALGO's Avatar
Registered User
Join Date: Jul 1999
Location: Jax, FL
Posts: 1,785
It could be a lot of things but, do a search on the fuel pump relay or the overvoltage relay (OVP), behind the battery. Specially, if you have jumped started the car recently. Other more obvious things to check like spark plugs, wires, cap and rotor, ignition coil, cold start valve.
Happy hunting.
'86 300E
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Old 03-12-2001, 10:44 PM
David C Klasse's Avatar
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Join Date: Jan 2001
Location: Mission Hills in the City of San Diego
Posts: 2,352
Check OVERVOLT RELAY like Hidalgo said, likely culprit of your problem.
2006 E350 w/ 155k miles (Daily Driver)

1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
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Old 03-14-2001, 08:33 PM
Posts: n/a
Ditto last 2 replys. Check the overvoltage relay, then Fuel Pump Relay. I Had the same problem. The Overvoltage Relay corrected my problem.


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