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Old 08-26-2002, 02:15 PM
mbe32094's Avatar
Registered User
Join Date: Feb 2002
Location: Bay area, CA
Posts: 107
Hard Starting Solved 94 E320

Hard starting on my car was solved. Before I had a hard time starting the car. The first sympton was the car cranks but it won't start, a sign of no fuel going through the fuel injection. After a few minutes I tried again and it starts. The caused of the problem was the OVP. The OVP was replaced and the problem goes away. After a while the problem came back. I thought again was the OVP or the fuel pump relay. This time the sympton was the first time I crank the engine (hot or cold engine) it starts then dies. The second try was I have to depress the gas then start the engine and held the ignition key for about 4 seconds until the engine start. This time there was fuel going through the fuel injection. The first thing I suspected was the fuel check valve next to the fuel pump. replace it but still the problem exist. So after reading all the possible problems I decided to replace the fuel pressure regulator. The hard starting is gone. I can start my car now with only one try.Remember the sympton was the car is hard to start in cold or in hot engine. In cold engine the car will start but dies out after the ignition key is released. In hot engine you will have to hold the ignition key a little longer till the engine starts.
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Old 09-12-2002, 06:38 PM
Spencer 300E
Posts: n/a
I am experiencing simular problems with my 300E. At first it took two attempts to start and always fired up on the second. Now it has gotten worse, to the tune of cranking for a extended period pumping the gas to get it to go. If the car is only off for a few moments it starts perfectly. I was leaning towards the fuel check valve but would like your opionion.
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Old 09-12-2002, 07:43 PM
Join Date: Dec 2001
Location: Southern California, U.S.A.
Posts: 8,503
It sounds to me like a fuel pressure problem, too. Could be the fuel pressure regulator or fuel check valve.

Just know that your engine and fuel injection is likely different than mbe32094's '94 E320.

If your car is a 1993 300E, then it has the same engine (either 3.2 liters or 2.8 liter M104).

If your 300E is a 1992 or older, then it is a different engine entirely (3.0 liter M103) with a different fuel injection and engine management system (M104's are HFM fully electronic ignition, M103's are CIS systems).
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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Old 09-21-2002, 09:55 PM
mark mitchell
Posts: n/a
problem solved

My starting problem on my 93 300e was solved with a new wireing harness! After replacing everything else first...
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