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#1
03-01-2015, 06:44 AM
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87 300SDL won't go into 4th?
I recently cleaned some vacuum lines on my 300sdl om603 turbo, most of them are ok except for the one connected to the nipple on the intake manifold which was plugged with oily stuff. I felt the increase in power after cleaning up that line.
Now that it seems like a different car. I'm not sure what the cruising RPM should be. At the moment, my engine revs at around 3200 at 60MPH on the highway. I can feel the engine breaking when I let off the pedal at this speed. Is this normal? or am I missing my 4th gear? TIA 
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#2
03-01-2015, 07:18 AM
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How many times does it shift if you take off from a stop and get up to highway speed?
__________________
Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar. 83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles 08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles 88 Jaguar XJS V12 94,xxx miles. Work in progress.
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#3
03-01-2015, 12:18 PM
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Make sure the kick down switch is not depressed. It is under the throttle pedal.
__________________
 Present 1987 300SDL 1991 300SL 1990 560SEL 2001 ML320 Past 1969 200D 1979-82 1983 300SD 1984-85 1972 250C 1982-02 1995 S350 2011 1997 S320 2012
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#4
03-01-2015, 12:20 PM
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I have to drive out and count to be sure. I'm aware that these cars start from 2nd if I don't select 2 then D while stopped - or am I wrong? (edit)
For example, when the selector is on D and I'm doing 50mph at around 3000rpm. If I let the pedal off and manually select 3, it should shift down and I should get a higher rpm right? Also, I checked the fluid level earlier after driving around the neighborhood for 10mins., it's about .3" below the bottom line. Last edited by nelman; 03-01-2015 at 01:23 PM.
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#5
03-01-2015, 12:23 PM
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Quote:
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#6
03-01-2015, 01:56 PM
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Are you sure you have second gear start? I know in my 87 300d w/ om603 it is first gear start. But I won't say yours (w126) definitely is first start either cause I don't know.
How fast can you get the car up to? If you're in fourth you should be able to easily hit 75+ and even up to 100 don't think you could do that in 3rd. Cruising at over 40 on flat ground my car is usually in fourth already, so yes shifting into 3rd at around 50 or so should cause it to downshift noticeably and rev up. You could try disconnected vacuum completely w/ the kickdown disconnected as well the transmission should shift through all the gears but with very hard shifts. Maybe it's low fluid, hope so think I read somewhere that fourth is the first gear to go on worn out transmissions. Good luck, what fun these 28 yr old automatics are huh 
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#7
03-01-2015, 02:24 PM
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Quote:
My kickdown is disconnected at the moment. Which vacuum lines should I disconnect? Is it the single line that went to the transmission? I will have to check the fluid again, it's quite tricky with this car. The tranny was rebuilt about 1 1/2 years ago before I got it from the PO so it's quite young.
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#8
03-01-2015, 02:38 PM
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Yes the single line going to the transmission, be sure to cap it somehow so it's not open to the air. Also you won't want to drive too long without any vacuum, the shifts will be very uncomfortable.
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#9
03-01-2015, 02:41 PM
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And by cap I mean on the vacuum supply side, so it's not leaking vacuum out.
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#10
03-01-2015, 02:41 PM
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Or sucking air in haha you get the picture
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#15
03-02-2015, 04:27 PM
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2850 rpms @ 70mph
__________________
BENZ THERE DONE THAThttp://www.peachparts.com/shopforum/...c/progress.gif 15 VW Passat TDI 00 E420 98 E300 DT 97 E420 Donor Car - NEED PARTS? PM ME! 97 S500 97 E300D 86 Holden Jackaroo Turbo D 86 300SDL (o\|/o)
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