mlm0

89 with auto. 3.07 gears

Does anyone know what to change in the ecu to allow my car to coast more freely when I let off gas. Right now when I use cruise control, it engages and disconnects so much it's not comfortable to use. I believe it's because the car starts to decelerate as soon as you get off the gas

bjankuski

Unlock the torque converter at less then 2 percent throttle or whatever it takes to get it to coast with minor engine braking.

mlm0

I don't really understand what all that means. I can change the settings but I would like to understand what I am doing

alankb

How do you change the setting?

bjankuski

See what the current settings are, if they are zero it means the torque converter is locked up solid with the engine when your foot is off the throttle and the car is coasting. This means that engine braking will slow the car down faster then you might expect or want. If you set the min load limit for converter lock higher then your off the throttle numbers the torque converter will unlock while coasting and have less engine braking and it will not slow down as fast. If you don't like how it works just put it back.

mlm0

thanks. Now I think I understand it. Right now it's about 3 per cent, so I will set it higher to coast more

mlm0

you have to have the proper ecu tuning hardware and software. You then can re-program the ecu

mlm0

ok after thinking about this, I was wrong, I don't understand it. Don't mean to be a pain in the ***, but!

i am using tuner pro rt, with $6E. To me, your first post and your second post seem to contradict each other. I'm sure it's me just not understanding it, but not sure weather to increase or decrease percent to make car coast more freely

thanks for taking the time to help me

bjankuski

The posts are saying the same thing and you have it figured out. The higher you set min numbers the more throttle it will take to cause a lock up of the convertor. So thinking about this in reverse that means if you want to have the converter unlock while coasting you need to set the min number higher. If it is unlocking setting the number higher will not do anything else.

Churchkey

The cruise in/out issue sounds to me like to much slack in the servo cable &/or poor vacuum to the servo.

Multiple holes for cable adjustment @ the servo.

TCC lock/unlock your call.

mlm0

i did adjustment, didn't help. I don't know how to test servo

bjankuski

Is your car stock or close to stock?

mlm0

stock

i think the cruse control works fine. The problem is that as soon as The cruse control gets car up to set speed, the control deactivates like it should, but car starts to slow down as in engine braking, causing the control to come back on right away. Trying to maintain a consistent speed with cruse control is jerky

have not played with ecu yet as suggested

joeld

This is just info for you, I have a 89 with the same engine,trans, and gear as you do. Mine is smooth with cruise on, no jerks at all.
As churchkey suggested, check vac lines, etc.
Hope this helps.

Joel

Bwbob

Check to make sure the cruise actuator can actually hold a vaccuum, i believe it should. The screws that hold it in the braket, if the got replaced with long ones or bigger ones, can cause a leak in the housing