mdricken

That pretty much says it. I put a carb on my motor and now don't have cruise or TCC lockup. Has anyone succeeded in rigging something up so that the ECM still gets its TPS signal so that it can do cruise and lockup?

I'm just looking for any ideas. It looks like its going to be pretty hard to rig something up in the already crowded behind-the-carburetor area.

Thannks.

Dave_Jones

I guess converting to a CCC Q-jet isn't the answer you're looking for.

One idea that just popped into my mind, you could attach a pull wire to the existing carb linkage or throttle cable...route the pull wire to a GM TPS (mounted vertically, and located on a bracket somewhere on the front of the intake manifold) so that the pull wire actuates the lever of the TPS sensor. You'd need to make an extension of some sort for the actuating arm of the TPS, so that the length of cable pull matches the angular sweep of the TPS. Hope that makes sense; it'd probably be easier to describe with a sketch than trying to explain it in words.

Z69

Somebody sells one of those. I've seen a picture.
Lokar, Street & Perf., ASM.....
Little box with a TPS mounted to it and a cable.
Had a little arm for the cable attachment and the tps arm to ride on.
Probably want way to much for it.
I've debated on making a tps mount for a holley. Just use the manual choke arm mounting holes for a mounting plate attachment point. The 3 holes. Then stick a tps on it with a short shaft with a threaded stud on one end. Stick it in the existing threaded hole on the end of the primary throttle shaft. Then put a little lever on the other end sticking into the tps to engage the tps arm.

dyeager535

You can always get the setup from a 1982-1986 C/K truck (PERHAPS the '87 and '88-91 R/V series) with 700R4. Completely independent harness, uses a vacuum switch on the passenger side firewall and the brake switch on the pedal. Some other thing I'm forgetting as well, but it does not use VSS, TPS, etc to operate.

Now those trucks get somewhat tricky in application (CCC CA only, with no knock sensor, etc) and with the switch to TBI in '87 with the '747 ECM, that might have changed lockup controls from vac to ECM, but I'm not certain of that. A non CCC truck from '82-86 with 700R4 is guaranteed to use that setup though. Very common.

The trucks also use a standalone cruise setup. (with electric cruise) Same 2 pulse VSS as the early thirdgen's (buffer mounted differrently IIRC though) , same cruise solenoid, standalone cruise computer, brake switch, etc.

My '83 K5 was real consistent with that lockup setup, I was pleased with it.

Fast355

iTrader: (2)

I like the vacuum control over the lock-up better than the ECM. I ran my 700r4 off the ECM for a while but changed back to the vacuum setup after I realized the factory TBI torque converter setup is crazy.

Vans and suburbans also have the lockup switch. On the van it is near the battery tray on the radiator core support. Make sure you grab the little vacuum delay valve.

On my van the switch is hooked to ported vacuum through a TVS and the delay valve. The TVS keeps the torque converter from locking until the engine gets to 115* coolant temp. The delay valve keeps small changes in load from causing the TCC to hunt which it can if it is not there.

Z69

You can also learn code and make it do what you want when you want.