From 0 to 1 MPH in 100 yards. 1995 e300d very slow off the line - Mercedes-Benz Forum
 
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post #1 of 8 (permalink) Old 04-03-2019, 10:58 AM Thread Starter
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Date registered: Dec 2014
Vehicle: 1996 E300 Diesel
Location: San Jose, California, USA
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From 0 to 1 MPH in 100 yards. 1995 e300d very slow off the line

My 1995 E300 diesel has developed a problem where it doesn't want to start rolling until it has moved about 100 yards at 1 MPH. If there is an up grade, it won't make the grade. After about 100 yards, it starts picking up speed and will do the city speed limit but it shifts at a high RMP. I thought it might be a plugged fuel line so I checked the fuel tank filter and found a lot of what looked like black algae which I cleaned out thoroughly, but that didn't solve the problem. Next, I thoroughly cleaned and lubed the accelerator linkage, but that wasnt' the problem. It still has no power off the line but moves along okay after it gets a long running start. I was getting a lot of middle finger salutes from drivers who were behind me and got stuck at the signal light because it took my car too long to cross the street! :-)

I put the OBD reader on it and got an error code for Fuel Rack Position Sensor (L7) and an error code for EDS Control Unit N39, internal voltage supply.

I am having a lot of trouble finding any data on this with Google search or even YouTube, or anywhere else. Can't even find diagrams for the parts indicated on the error code, so I don't know what they even look like. Obviously, I am not much of a mechanic but I want to learn how to keep this old diesel Benz road-worthy.

I know Mercedes-Benz puts a lot of "engineered for obsolescents" parts on their cars, but these machines roll along so smooth and give such a very nice drive, I'm addicted. How can I fix this old beauty?
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post #2 of 8 (permalink) Old 04-03-2019, 11:05 AM
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Those are first years of car digitizing, so don't relay on scanners too much.
When you have seen algae -single cleaning might not be enough.
Sometimes it takes 2-3 fuel filter replacement to filter it all.
Than is your engine having intake flap?
Those are common problems in those years.
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post #3 of 8 (permalink) Old 04-05-2019, 09:17 AM Thread Starter
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Thanks for the advice. The tank is clean as are the filters. Yes, there is an intake flapper. I'll have a look at it.
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post #4 of 8 (permalink) Old 04-05-2019, 10:19 AM
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Are you sure this isn't a transmission problem? In that vein, have you checked the battery? Low battery voltage can cause weird problems with the 722.6 transmission, which is what I believe your car is equipped with. How many miles on the car? How long have you had this problem?
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post #5 of 8 (permalink) Old 04-07-2019, 07:47 AM
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Quote:
Originally Posted by CheckEngine View Post
Are you sure this isn't a transmission problem? In that vein, have you checked the battery? Low battery voltage can cause weird problems with the 722.6 transmission
The 95' E300D has an all mechanical transmission. Only a throttle shift cable and vacuum line go to it.

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post #6 of 8 (permalink) Old 04-09-2019, 10:44 AM Thread Starter
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Thanks Folks for the advice. I work on my cars outdoors. So, the weather is a bit of a problem but spring is around the corner. The battery is new. I don't think its a transmission problem because it gets very low RPM. Once it speeds up it starts shifting okay.

The rainy season seems to be just about over here in California so I am anxious to try some of these tips. I have a 1995 and a 1996 E300 model diesels so I am not stuck for transportation. But keeping them both running is a bit of a trick since Mercedes engineers so many "got-ya's" into their cars. It's bad enough when a part fails, but when it is purposely engineered to fail ... well that is a problem.
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post #7 of 8 (permalink) Old 04-09-2019, 11:25 AM
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Well.. the 2 MY you have were experiments IMHO.
The NA diesel has lousy power curve and the intake flaps have been headaches for lot of owners.
If I remember it right, in 1994 MB made turbo diesels and in 1998 again.
You are just between good years
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post #8 of 8 (permalink) Old 07-01-2019, 12:29 PM Thread Starter
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Thanks for all the advice, Folks. I replaced all the old leaky rubber vacuum lines and found that the previous owner had routed two of the lines wrong. Now it runs fine.
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