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-   -   Lousy mpg '94 E420 - Causes? (http://www.peachparts.com/shopforum/showthread.php?t=201063)

Larry Delor 09-29-2007 10:26 PM

Lousy mpg '94 E420 - Causes?
 
I've been getting lousy mileage on my E420 lately. Well, at least since I've replace the ETA (wires toast) and a few weeks later the MAF (voltage code).
I'm guesstimating 15mpg, if I'm lucky. No codes, except for an upshift delay code a few weeks ago - hasn't returned since clearing it.
Until the wiring shorted out in the old ETA, I could get 23-24mpg.
Did I get a bum rebuilt unit? (4mercedes) or is this just a coincidence, and I need to look elsewhere?

Thanks!

Oracle12345 09-30-2007 01:57 PM

Whats it supposed to be getting?

Mercedes are know to get crappy gas mileage but you could clean ouf some of the parts in the fuel system such as the injectors and other devices.

Larry Delor 09-30-2007 08:53 PM

If I had dirty injectors, I would think that I would have a rough running engine - I do not. It is getting close to cap and rotor replacement time, but not so much to explain the poor mpg that I am getting. I used about 1/2 tank for roughly 100 miles.

deanyel 09-30-2007 09:14 PM

You might pull the plugs and see what they look like - could be a clue there.

DRICHFL 10-14-2007 10:01 AM

Poor gas mileage
 
Larry, change your spark plug. Stick with Bosch Spark Plug FR8DC. Also consider changing your air filter, fuel filter and run some fuel injector cleaner.

anziani 10-14-2007 12:47 PM

E420 mileage
 
Larry,
I have the same car. I average about 22-23 mpg on trips but it falls to 14-15 around town with the AC. I don't think you will do any better with the V-8. And you need to test using multiple tanks of fuel, not just one.
Anziani

87 300E 200K
95 E420 108K

deanyel 10-14-2007 01:52 PM

I too have the same car and get 27-28 on the highway and 20 in the city.

manny 10-14-2007 05:25 PM

Quote:

Originally Posted by Oracle12345 (Post 1633499)
Mercedes are know to get crappy gas mileage but you could clean ouf some of the parts in the fuel system such as the injectors and other devices.

Huh ?
You better quit smoking the " good stuff ".
My Mercedes ( V-6 ) gets better gas mileage, than my VW ( 4 cylinder ) ever did. ;)


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