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Old 06-21-2011, 08:24 PM
Registered User
Join Date: Jul 2002
Location: Dallas, TX
Posts: 77
300SEL Trans Issue

I just got back from a long trip and I think my transmission died right when we got home. It was a long 5 hour trip in Texas heat. Everything was perfect until 5 minutes from the house. The trans started slipping and not wanting to stay in gear.

We made it to the house and the next morning checked the trans fluid and it was totally outÖor at least not showing up on the dipstick. Put 2 quarts in and itís now at the proper level but the trans wonít upshift unless I take my foot off the accelerator completely then push down back down. Shifts are smooth but thereís something wrong.

Any suggestions??? Please help, I really donít want to a rebuild.

1991 300SEL 169,000

Thank you

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Old 06-21-2011, 08:34 PM
engatwork's Avatar
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 13,425
When you checked the level was the car up to temp, on level ground with the engine running, in park? This is how you want to check it.

You see anything leaking when it is running?
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Old 06-21-2011, 08:43 PM
Registered User
Join Date: Jul 2002
Location: Dallas, TX
Posts: 77
Yes, it was in the garage on a flat level ground and up to temp. I check the ground everyday to see if anything is leaking and there's nothing. I don't understand?? I know engines use oil over time but trans??
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Old 06-22-2011, 07:46 AM
Senior Member
Join Date: Nov 2002
Posts: 817
if the modulator is shot, the vacuum will pull atf into the engine. every 1 i've seen do that makes smoke like a destroyer in a ww2 navy movie. maybe you have a small vacuum leak? if it's not on the ground, it's out the tailpipe. good luck, chuck.
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Old 06-22-2011, 08:19 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
ditto on what "porkface" suggested.

Check modulator, should hold vacuum.

Also try adjusting control pressure cable or even driving with cable disconnected.

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