General Category > Quadrajet Carb Talk and Tips
TV linkage for mid '70s Q-jet
77cruiser:
If you haven't checked in here do so, lots of 200-4r info.
http://www.turbobuick.com/forums/transmission-talk.12/
Too Fast:
Thanks Jim. I checked out some at that forum but didn't find my problem there, yet.
I have a pressure gauge hooked up, seems like I have too much pressure at idle. It's 115psi, never lower, in P, N, OD, and D. From most sources, that high pressure will not allow a 1st gear start, unless the trans has been modified for it. That's why I say most sources. I do have instant pressure rise when I touch the gas, so the adjustment on the TV cable should be close. With the cable connected, at ~1500 the pressures are up about 10 psi.
I read somewhere that if the pressure isn't lower than at least 90, it won't allow 1st gear starts. A check they said was to put it into neutral after a drive, then OD or D, and see if it starts in 1st. Mine will that way, but won't upshift out of 1st! Then next stop, starts in 2nd again then will upshift to 3rd, then sometimes 4th. Lock-up is a crap shoot.
I'm getting a carb spacer so I can be sure my geometry is perfect. If I can't with the spacer, then I'm changing the base plate, then I'll either go back to my original trans place or get a second opinion. I'm sure the connected pressure gauge will help.
Cliff Ruggles:
What method or methods are you using to get lock-up?
The TCC system is completely independent of the TV valve and everything else related to transmission function.
The factory used several different methods to utilize the TCC as you will find various different wiring diagrams for the valve body and LU solenoid.
Is this a "retrofit" into an older vehicle?.....Cliff
77cruiser:
Try to find out what he put in for a shift kit & what else is done to it. Did you check pressure @ max TV?
Too Fast:
Cliff, the lock-up is purely mechanical. No wires. It probably should unlock when the trans downshifts to first, but since it never does, I suspect that's part of its problem. Yes, it is a retrofit, into my '68 Le Mans with a 400 Pontiac. I'm more concerned with the shifting right now, trying to get that right, before I worry too much about the LU.
Jim, full stroke on the TV cable at about 1500 RPM equals 265-270 psi. I don't know what type of shift kit they used, I asked for something very firm. The 2 or 3 times it has worked normally shifting, I'm pretty sure the firmness I want will be there, just don't know positively since the only somewhat reliable way to get it to upshift is by letting off the gas to allow the shift. Absolutley will not upshift over more than 25% throttle.
1" 4-hole spacer for my dual plane intake should arrive tomorrow or the next day, then the pull on the TV cable will be a perfect straight pull, no slight angle. Really don't think it will make any difference (except to cool the carb/fuel some and maybe a small bump in torque), but I'm going to be sure it is all perfect before I take it back to the trans shop. Can't wait for this to shift correctly!
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