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#1
05-03-2010, 12:15 PM
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Low vacuum level at the tranny
My '87 300td started to shift a bit too firm. I checked the line going to the modulator and it reads only around 8 at idle.Expected more like 15. Where to look next? Appreciate any comments.
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#2
05-03-2010, 01:30 PM
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Be good to start by confirming the output of your pump.
If its good, start checking for cracked and leaking lines to include the fittings.
__________________
1985 300D 198K sold 1982 300D 202K 1989 300E 125K 1992 940T "If you dont have time to do it safely, you dont have time to do it" "The democracy will cease to exist when you take away from those who are willing to work and give to those who would not."
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#3
05-03-2010, 01:38 PM
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The old style pump is known for failure and should be updated to avoid it falling apart...the updated version has screws on the outside of face (toward radiator), while the old style/original vacuum pump had a smooth face with no screws. Which do you have?
Also, how much vacuum are you getting elsewhere?
__________________
1987 300TDT - 195,000 (Original #14 head) 1993 190E 2.3 - 105,000 1981 300D - 250,000
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#4
05-03-2010, 02:17 PM
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Quote:
This will confirm whether you've got a vacuum leak elsewhere in the system (highly likely). If you haven't already done so, all the vacuum components on the right side of the vehicle and be disconnected and the four way that's at the output of the vacuum pump can be changed to a two way (F) connector.
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#5
05-03-2010, 02:45 PM
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OK - will go to the source. I have the "new" design vacuum pump I installed sometime last year. And I have dumped all the stuff on the right side of the vehicle as recommended (2-way connector from the main supply). Will keep you posted.
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#6
05-04-2010, 10:51 AM
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OK- checked the vacuum going into the transducer at 22, pulled the vacuum on the transducer:holds, pulled the vacuum on the modulator:holds. Vacuum at the nipple for the line to the modulator:8. Is it the way it is supposed to be?
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#7
05-05-2010, 11:48 PM
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Quote:
What is the vacuum that is going into the VCV? And, what is the vacuum output from the VCV to the transducer?
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#8
05-09-2010, 10:49 PM
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Quote:
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#9
05-06-2010, 06:35 PM
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Is the nipple partially blocked?
__________________
Charles 1983 300D, bought new, 215k+ miles, donated to Purple Hearts veterans charity but I have parts for sale: http://www.peachparts.com/shopforum/mercedes-benz-cars-sale/296386-fs-1-owner-83-mb-300d-turbo-rebuild-parts.html
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