1995 E420 - deja vu chug chug chug... - Mercedes-Benz Forum
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post #1 of 17 (permalink) Old 08-09-2019, 02:51 AM Thread Starter
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1995 E420 - deja vu chug chug chug...

I have a 1995 E420 with 38,000 miles. The car had 19,000 miles when I bought it about four years ago and I try to keep her in driving rotation a couple days a week.

I have a recurring problem. Car develops a bad miss that gets progressively worse. If she is driven every day there is no noticeable problem. If I skip a day I can expect that she will start up beautifully, and drive beautifully until about 15 minutes in and at the next redlight it will begin - chug chug chug.

Mercedes-Benz of Knoxville charged a fortune and replaced plugs, wires, rotor buttons, caps, and coils.

Solved the problem for about 6 months and then the exact same problem.

They replaced rotor buttons, caps, and wires. Another fortune.

Six months later same thing.

Took it to Bearden Benz because dealership wasn’t able to solve the problem and spent $1500 on - any guesses??? Plugs, wires, rotor buttons, distributors, and coils.

What is causing this? I know sitting is bad - but she’s one of several and is kept in a humidity and temperature controlled garage.

Chug chug chug.
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post #2 of 17 (permalink) Old 08-09-2019, 02:57 AM Thread Starter
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Here she is.
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post #3 of 17 (permalink) Old 08-09-2019, 01:18 PM
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Have you checked and replaced all the fuses? OVP? How is the wiring?
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post #4 of 17 (permalink) Old 08-09-2019, 01:19 PM
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Being a trailer queen, has the dreaded eco junk wiring bug been eradicated yet these cars all came with???

There is no OVP on the LH driven V8 M119 engines.
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post #5 of 17 (permalink) Old 08-09-2019, 01:51 PM Thread Starter
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Former trailer queen... the dealership checked the wiring harness and didn’t find any issue. Heat is the biggest issue with the harness, I believe, and their recommendation was not to replace.

I believe Bearden also checked the wiring harness.

If fuses were an issue would the swap out of all the electrical have fixed the problem?

I appreciate the input. I need something to take to the dealer since they aren’t figuring it out.
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post #6 of 17 (permalink) Old 08-09-2019, 02:27 PM
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Did they check the electronic throttle body? It also suffers from the same wiring disease and causes all sorts of driveability issues

Have them check the date code on the part itself. Anything fab'd prior to 1998 is eco junk.

Also, Bosch F8DC4 is the sole proper plug for that engine. MB no longer sells that plug, and sub'd in a BERU plug which is not quite the same. I bought out the entire stock of MB F8DC4 plug here in Europe before they went NLA

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post #7 of 17 (permalink) Old 08-09-2019, 06:25 PM
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Your problem is the insulators behind the rotor. They are plastic disks that prevent leakage of the spark once the caps start to wear. But once the insulators are worn (probably 25 years old now), the spark just jumps where it wants to inside the distributors. If you drive the car regularly, it will hide the problem. Let it sit, and you have exactly what you are experiencing right now. You will need two. Thank GSXR and the boys at the 500e board for this fix. Mercedes calls them dust shields and this is exactly why a dealership mechanic will overlook them. They are MORE than a dust shield.

https://www.fcpeuro.com/products/mer...eld-1191580188
Jayare and luckymike like this.

Last edited by tuttebenne; 08-10-2019 at 04:33 AM.
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post #8 of 17 (permalink) Old 08-10-2019, 04:32 AM Thread Starter
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TutteBenne - that makes perfect sense! I will order these and get the rotor and caps replaced as well. Hopefully nothing else is fried but even if I have to go through replacing more I’ll have a good hope of it being the last time for a long time.

Man. What a relief. Seriously. She is my favorite among all the cars I have ever owned. A little chunk of my souls falls off with every splutter. 😁

Thanks! All’s Well is right!
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post #9 of 17 (permalink) Old 08-10-2019, 09:50 AM
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From what I have read on this thread and my years of experience with these specific cars the following updates should be performed due to age:
-Replace upper wiring harness - inexpensive and easy to replace (about 2 hours start to finish) Harness is about $200 on ebay and as long as it has a Delphi label, no broken connectors and a build date of 2000 or newer the used ones will work for decades. As mentioned above they ALL go bad

Experienced MB independent shops that know these cars usually will not begin any troubleshooting of this type of engine problems until the harness has been replaced.
My experience is the wiring harness is the problem 95% of the time and the insulator/dustshields are 5% of the time.

I would then keep an eye open to pick up an updated throttle body or one with rebuilt wiring as it will be next on the list.


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post #10 of 17 (permalink) Old 08-10-2019, 10:19 AM
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Quote:
Originally Posted by magicbigdaddy View Post
My experience is the wiring harness is the problem 95% of the time and the insulator/dustshields are 5% of the time.
.
Maybe you don't have a lot of M119 experience? Dust shields are a huge issue these days on M119s. You can get away with it on an M103 or some others but not on a 20+ year old M119.
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