Question Details

A few years back my 1997 E420 started to run poorly and was burning a lot of gas, had an error for three ignition coils misfiring. I also had a CLK320 and 560SEL so I garaged it for a later day. When parking I added stabilizer to the fuel and buttoned it all up tight dry and clean. So here we are a few years later and it is my last MB and I wanted to get her running again. It will turn over but not run. I have no error lights or codes in the computer. I went ahead and did a bunch of maintenance so I am not willing to give up yet. Whats done so far.

New plugs x8
New ignition Coils x8
New Water Pump
New Electric radiator fans
New Oil and Filter
Drained tank and put in fresh gas
New Fuel Pump and Fuel Filter
New O2 Sensors x4

All this was done before I tried to turn it over. It turns over easily and I don't hear anything I shouldn't. What I am no longer hearing is the noise from the fuel pump. I used to hear a soft noise as soon an the key was on the 2nd position. I have checked every fuse I can find in the car and pulled out the K40 which looks as new as the day it came from the factory. The pump tested great on the bench so I know it is good. Any one have a suggestion or next step in my testing? Thank you for your time.



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MBFanatic  1 year 4 months ago

Nice W210. The first thing that I would do is connect a fuel pressure test gauge to the port on front of the engine (by the fuel rail) and measure the fuel pressure. You want to verify it is not getting fuel. If it is getting fuel then you should check for spark. You can easily test for spark by using an inline spark plug tester. Or even by removing the spark plug and grounding it to the engine body.

If you don't get any fuel pressure that means the fuel pump is not getting power.
Unplug the electrical plug from the fuel pump. Connect a multi meter to the wires that go into the fuel pump. Do you read 12 volt when you turn the ignition to ON ( position II)? If you don't that means there is an electrical issue. EIS may not be enabling start condition. At this point you will need a good scanner to diagnose further.

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Michael McFearin  1 year 4 months ago

I gave it that old college try and I tried to start it again a few times. After wards I pulled off the MAS and manually opened the throttle body and found entry of fresh fuel there. I found that if I pumped the gas pedal rapidly the engine would actually try to run but just wouldn't get there. The dash showed ASR in large letters for a minute before returning to the normal screen. My odb still shows no codes

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MBFanatic  1 year 4 months ago

Don't worry about the ASR at this point. Your OBD 2 is most likely a generic OBD2 scanner that's why it won't show anything. You will need a scanner such as Star Diagnostic or Carsoft that can read MB codes. If you have an advance or autozone near by go borrow a fuel pressure gague. See what kind of pressure you are getting. The pump may be running but not creating enough pressure.

That's a rare engine which you probably already know. It was installed in the E class only for model year 1997. Used to have one a few years back. They are solid engines. One of the common issues with them is the lifter noise caused by the oil tube near the lifters.

Don't give up. I think you will be able to bring her back to life.

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