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#1
05-24-2005, 10:01 PM
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trans won't upshift
I know it's not a diesel but you guys are so helpful and I couldn't find anything in the tech or diesel forum searches.
The car is a 91 300SE. The owner brought it to me with the complaint that it would only occasionally upshift out of first. I found that the vacuum modulator was bad and replaced it today. Now it shifts perfectly in all gears except 4th. In 20 miles of city driving I got it into 4th once and it downshifted into 3rd after a minutes at a constant speed. It will not upshift into 4th under any condition, high RPM, light throttle, cold, warm, etc.. What is wrong, it's driving me nuts. All the other gears can't get much nicer.
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Adam Lumsden (83) 300D Vice-President of the MBCA International Stars Section Last edited by rg2098; 05-24-2005 at 10:12 PM. 
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#2
05-24-2005, 10:11 PM
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Forgot to mention it has 80,000 miles on the car. He drove the car a week before buying it and it was fine, then a few days later the seller called and said the car wouldn't shift out of 1st. He made an offer and bought it for a cheaper price.
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Adam Lumsden (83) 300D Vice-President of the MBCA International Stars Section
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#3
05-24-2005, 10:15 PM
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my car same problem
i have the same problem and my problem began when i changed
my driving habits... i heard someone say you need to floor these things. so i started flooring the car.... and then this problem started... some times i sooth my problem by adjusting the kickdown cable on top of the engine... its a tuning issue between the modulator and the kickdown cable... so you need to tune the modulator valve it should leak down to zero for 4th gear shift... get a vaccum hose, 3 yards and geta vacum gauge and start driving..
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#4
05-24-2005, 10:19 PM
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I completely unpluged the modulator line and drove it, still no 4th gear, but all the other shifts were hard mechanical as they should be with the line unplugged.
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Adam Lumsden (83) 300D Vice-President of the MBCA International Stars Section
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#5
05-24-2005, 10:56 PM
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kick down cable
when i loosened my kick down cable it started working for me..
but its still not perfect...my 4 does not work with zero vacuum as well.. i read for an older car you might need 2pt to make it work.. http://business.baylor.edu/Richard_Easley/autofaqs/main.htm i found a great explination of this at the above web page with photos.
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#6
05-25-2005, 06:43 PM
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Kick down switch under gas peddle is stuck down.
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84 500 SEL (307,xxx miles)
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#7
05-25-2005, 06:53 PM
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Quote:
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Adam Lumsden (83) 300D Vice-President of the MBCA International Stars Section
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#8
05-29-2005, 09:43 AM
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Any update Adam?
__________________
Michael LaFleur '05 E320 CDI - 86,000 miles '86 300SDL - 360,000 miles '85 300SD - 150,000 miles (sold) '89 190D - 120,000 miles (sold) '85 300SD - 317,000 miles (sold) '98 ML320 - 270,000 miles (sold) '75 300D - 170,000 miles (sold) '83 Harley Davidson FLTC (Broken again) :-( '61 Plymouth Valiant - 60k mikes 2004 Papillon (Oliver) 2005 Tzitzu (Griffon) 2009 Welsh Corgi (Buba) 
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#9
05-29-2005, 10:39 AM
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Heres how it sits today.
1) Bad vacuum modulator replaced 2) kickdown cable adjusted perfectly 3) fluid change 4) new kickdown switch (owner replaced before bringing it to me) 5) can of Trans-X poured in The owner picked up the car last friday. It shifted perfectly in all gears except 4th which it would not touch, when we went around the block. When he was about 10 miles away he called me and said it was having trouble shifting out of 1st again. It appears to be tempature sensative now, where as before it just wouldn't shift period.
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Adam Lumsden (83) 300D Vice-President of the MBCA International Stars Section
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#10
05-29-2005, 01:24 PM
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Trans-X comes in at least two size cans.... and it took TWO of the larger squatty quart looking cans to fullfill the instructions for initial application in my 81 wagon... to make the percentage of the total fluid correct...
And it may take a hundred miles and shifting through the gears manually to clean out the holes....
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#11
05-29-2005, 01:34 PM
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Quote:
__________________
Adam Lumsden (83) 300D Vice-President of the MBCA International Stars Section
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#12
05-29-2005, 01:38 PM
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There are two types of the Trans-X... Did you use the tuneup/leak fix ?
Did you see two different rates for initial compared to permanent ?
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#13
05-29-2005, 03:55 PM
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Quote:
__________________
Adam Lumsden (83) 300D Vice-President of the MBCA International Stars Section
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#14
05-30-2005, 03:54 AM
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Apply full vacuum to the modilator to see if it will shift under those conditions. If it shifts, your problem is in the vacuum from the vacuum control valve or vacuum amplifier.
__________________
Tony from West Oz. Fatmobile 3 84 300D 295kkm Silver grey/Blue int. 2 tank WVO - Recipient of TurboDesel engine. Josephine '82 300D 390kkm White/Palamino int. Elizabeth '81 280E, sporting a '79 300D engine. Lucille '87 W124 300D non-turbo 6 cylinder OM603, Pearl Grey with light grey interior Various parts cars including 280E, 230C & 300D in various states of disassembly.
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#15
05-30-2005, 01:16 PM
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Quote:
__________________
Adam Lumsden (83) 300D Vice-President of the MBCA International Stars Section
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