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#1
03-12-2016, 12:00 PM
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1990 300D rough 1-2 shift
Just put a reman tranny in my 90 300D. The problem is I'm having a rough 1-2 shift all other shifts are firm. I've followed the FSM to set the vcv ccw until it stops at wot. Mod pressure set to spec and vac system gone over for leaks. I replaced all the vac soft hoses in the engine bay. From vac pump to vcv there is a green .7mm orfice installed. Bowden cable set with slight tension. Also, I should add that I've done the following mods. Removed EGR, BFS, added a pressure wastegate, and adjusted the ALDA one turn ccw from factory setting, and removed over boost protection (have hose directly from manifold to ALDA and I have a boost gauge installed I keep a sharp eye on). Car makes good power shifts nice at full throttle. Has a little bit of a shaky idle at times but other than that runs really well. The rough shift happens mostly at slight to half throttle warm and cold.
My question is, now that I've messed with the ALDA and deleted the BFS shift circuit can I play with the adjustment on the VCV to fine tune it? Just wanted to know what you guys recommend adjusting. Thank you in advance!!! Jim
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85 250D euro 87 300D 
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#2
03-12-2016, 02:03 PM
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See the links on post 3 of this thread:adjusting shift points
They were very helpful to me. I fine tuned the vacuum bleed off with a drip irrigation needle valve teed into the line in place of the orifice restrictor. The cost was less than $4 for a pair at the local OSH. Note, erratic shifts can arise from vacuum leaks in the HVAC system.
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78 W116 300SD 'Desert Rose' new as of 01/26/2014 79 W116 300SD 'Stormcloud' RIP 04/11/2022
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#3
03-13-2016, 02:05 PM
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Try backing off the tension on the Bowden cable a tad
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1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior  Don't leave that there - I'll take it to bits!
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#4
03-14-2016, 06:36 AM
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Update: I backed off the tension on the Bowden cable, turned my modulator ccw a quarter turn, removed the restrictor and this did the trick. Shifts are smooth and firm.
Thanks again!
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85 250D euro 87 300D
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#5
03-14-2016, 08:47 AM
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Nice one - don't let them "slam" - "Firm" is a bit German but "slam" will break stuff.
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1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior Don't leave that there - I'll take it to bits!
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