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Discussion Starter #1
I'm at my wits end.

Replaced fuel pump, fuel filter, prefilter, glow plug relay, and crankshaft position sensor and my 300d still isnt starting.....rough idled and died out of nowhere a week ago. Someone help me!!
 

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Premium Member
1998 E320 base sedan @ 160kmiles
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6,368 Posts
Check crankshaft position sensor wiring to the Engine computer.
Check the K40 relay module to make sure that there are no cracks in solder pad. And the fuses on it have power when the key is in position 2.
 

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Outstanding Contributor , SDS Guru
1998 MB E300TD, 1997 MB E36 AMG, 2001 MB E55 AMG
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Why did it die to begin with?

Do you see air bubbles in the fuel lines?
 

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E320/E250 Bluetec Ford F350 6.7l
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1996 had diesel engine grandfathered from W124.
Don't recall those having CPS, so post some pictures what you have?
And ditto on Deplore's comment of checking fuel lines.
 

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Premium Member
1998 E320 base sedan @ 160kmiles
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6,368 Posts
1996 had diesel engine grandfathered from W124.
Don't recall those having CPS, so post some pictures what you have?
And ditto on Deplore's comment of checking fuel lines.
So he replaced something that did not exist ?
STAR TekInfo

Figure 4.
 

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E320/E250 Bluetec Ford F350 6.7l
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That's why I ask. 1996 was the year of transition, when older engines had manual IP control and vacuum logic system.
Newer engines went digital.
Quite a difference in technology.
 

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Discussion Starter #7
I'm not seeing any fuel movement. It was running fine then rough idled and died. Now just cranks. Not sure wth happened.
 

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Outstanding Contributor , SDS Guru
1998 MB E300TD, 1997 MB E36 AMG, 2001 MB E55 AMG
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3,667 Posts
Top off gas tank, jack up the car from the back so the nose is pointing down, open hood and crank the car and look at the fuel lines.

What happens?
 

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E320/E250 Bluetec Ford F350 6.7l
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x2 on topping off the tank. That will put fuel level well above the engine, so it will kind of self-prime.
If that is not enough, you can crack fuel line at the injector like 1/4 turn and observe what is coming out during cranking.
 

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1998 E320s sedan and wagon
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994 Posts
I’m pretty sure all 210 E300s have electronic throttle.

Isn't there some sort of fuel shutoff device by the big filter that’s prone to leaks or failure.

Is there a catalyst in the exhaust system that can clog?

Sixto
98 E320 wagon 197K miles
 
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