switching from 91 to e85 - Mercedes-Benz Forum

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post #1 of 7 (permalink) Old 02-19-2011, 09:17 PM Thread Starter
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Question switching from 91 to e85

ok i have a 1993 190e 2.6 Mercedes. i live in a really small town out in the middle of no where and 91 gas is hard to find. we didn't know that it would require premium gas when we bought it. i have heard that their is a chip that can be put into the computer that would make the car run on e85. does anyone know anything about this? like how much it cost and where i can find it? also if it can be installed at home or if i have to take it into a dealership?
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post #2 of 7 (permalink) Old 02-20-2011, 04:39 PM
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I've no clue about chips, but i'd think the bigger issue might be the deterioration of rubber parts from the alcohol mix. If possible, it will likely take all new fuel lines and o-rings.

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post #3 of 7 (permalink) Old 02-20-2011, 05:27 PM
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Here in California we have high percentage of alcohol in gasoline for like generation and beside sh**y gas mileage and performance never heard about ill effects.
I know newer engines are equipped with antiknock sensor that will adjust timing to the octanes, but not sure about 93 model. Go to the right section (W201) ? And check there.
Even if the car doesn't have the sensor -all you have to do is lift your foot on gas pedal a bit when you hear the pinging.
I still would carry couple gas cans to fill up with premium whenever possible.
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post #4 of 7 (permalink) Old 02-21-2011, 09:23 AM
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There's not a chip that would change what kind of gas it will run on.
It will run on lower octane, but will not produce the same results as with high octane.

The engine will knock, lower performance, etc..
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post #5 of 7 (permalink) Old 02-21-2011, 09:30 AM
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Can you find 90 or 89 fuel with no more than 10% ethanol? Either of those would be preferable to the E85 junk. And don't bother with the various octane boosters. It will take several cans to get most of the lower grades where you need to be.

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post #6 of 7 (permalink) Old 02-21-2011, 10:53 AM
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that car would run fine on sub 90 octane, ofcourse less power. just move the EZL "octane whele" to a lower setting. ofc. this is not a ideal solution but it wil work.

generaly the "S" stands for premium (95 octane and up)
and "N" for low grade octane.

there are several numbers in betwen that would possibly suit better but i dont have these numbers atm

E85 in these cars are hard, and the stock CIS-E and EZL system cant cope with alcohol. you usualy need to uppgrade the ign. and inj. to EFI or better (many use Megasquirt)
tuned and maped propperly!

91' W124 230TE
94' W124 E220 Sportline
76' W116 280S

Last edited by PerMB; 02-21-2011 at 11:02 AM.
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post #7 of 7 (permalink) Old 02-21-2011, 10:37 PM
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e85 is literally ACID

it affects metal plastic and rubber

everything it touches will burn over time. a proper conversion uncludes the entire fuel system and then some

vw phaeton. when vw copies mercedes, but forces you to service it next to golfs and jettas
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