1990 300E - Mercedes-Benz Forum

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post #1 of 9 (permalink) Old 03-19-2008, 10:37 PM Thread Starter
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Smile 1990 300E

We have a 1990 300E with a transmission not working properly. It doesn't shift properly. It has 150,000 miles on it and had not been driven much at all over the last 3 years. We understand that changing fluids and etc may not be a good idea because it may do more damage?? Can some person help tell us what to do next?

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post #2 of 9 (permalink) Old 03-20-2008, 06:29 AM
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If it's not working properly now, what harm can changing the fluid/filter do? That's where I'd start. I don't buy the "if the transmission has never been serviced, then leave it alone" theory.

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post #3 of 9 (permalink) Old 03-20-2008, 10:01 AM
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I agree with Sokoloff, you already have issues the easiest and cheapest thing to do is have your fluid and filter changed. Make sure whoever you get to change the fluid drains the torque converter as well.
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post #4 of 9 (permalink) Old 03-20-2008, 10:06 AM
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It won't hurt anything except your wallet to change fluids. It's NOT going to fix ANY problem.

Kent Christensen
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post #5 of 9 (permalink) Old 03-20-2008, 10:49 AM
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It could be a vacuum/modulator valve issue. Look into it, it's an easy/cheap fix if you're lucky.

"If spending money you don't have is the height of stupidity, borrowing money to give it away is the height of insanity." -- anon
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post #6 of 9 (permalink) Old 04-01-2008, 09:24 AM
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i have the same model and I have a question as to what is that button down the steering console? I think it goes forward and backwards.
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post #7 of 9 (permalink) Old 04-16-2008, 11:12 AM
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Avoid having it "power flushed". Try draining thru drainplug (you'll only get about 1/3 of the fluid out) and adding fresh fluid with a product called "Seafoam". If no improvement, have it drained with a filter change (again avoid power flushing). If none of this works have modulator checked/adjusted. Last resort would be power flushing it.
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post #8 of 9 (permalink) Old 04-16-2008, 11:51 AM
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Your car...

has a drain plug on the torque converter, so you should be able to get more than 1/3 of the ATF out... as indicated above, be very "wary" of power flushing.

I haven't heard of using Seafoam in the transmission, but it is a known fix for some problems when used in the crankcase, on vehicles designed for conventional [not synthetic] oils.

Also, don't forget the transmission filter.

Good luck,

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post #9 of 9 (permalink) Old 04-16-2008, 12:34 PM
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"Seafoam" is available for crankase and transmissions. Make sure you use the transmission Seafoam and let it work in for at least 20 miles or so.
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