I am just looking for an explanation on this. Its a 98 yukon with freshly rebuild auto trans. When I'm cruising over sixty it starts to slip out of OD up to 2000rpm. If I gas it a lil the darn thing drops back down to about 1400rpm where it should be. There is plenty of fluid in her. (Maybe to much?) It does not make any sense to me! You would think that it would slip worse under load...What am I missing here.
Anybody?
Under light load that trans is programmed to have minimal line pressure, among other control changes.
A test drive with scanner installed is required to to determine if it is 4th gear slip or TCC slip (more likely). Either way, have an experienced tech evaluate it. Soon.
My guess, is that your throttle is at such a low position the the idle switch is activated causing the converter to un-lock. When you ease back into the throttle, the converter locks back up and drops your RPM's.....Dan
Under light load that trans is programmed to have minimal line pressure, among other control changes.
A test drive with scanner installed is required to to determine if it is 4th gear slip or TCC slip (more likely). Either way, have an experienced tech evaluate it. Soon.
My guess, is that your throttle is at such a low position the the idle switch is activated causing the converter to un-lock. When you ease back into the throttle, the converter locks back up and drops your RPM's.....Dan
I was hoping this might be it but after thinking about it and driving the truck I am afraid not. I can't get it to happen consistently. If it was a miss adjusted throttle sensor it should happen consistently under the same conditions. I am getting no codes for a trans problem. I know I need to take it to a pro but dangit ain: The (pros) rebuilt this thing. :boxing: I don't like anybody to work on my cars but me. Maybe I should toss in a manual trans. :sweat:
Actron dosn't make any good scanners, there nothing more than code readers, I have 1, they do work in a pinch. need somthing like a snap on modis or a OTC genisis to get a datastream
Yes my Actron scanner won't do live data. I see your point that there are many different things that could be the problem. I am not going back to the shop that rebuilt the trans. They will not be any help. I will take it to a guy my friends say is real honest.
From what I understand the idle switch is used to unlock the converter when you take your foot off the gas. I don't even know that this truck has that deal. That was someone else's suggestion. I would like an easy fix I could do myself but with newer cars that does not happen for me often.
Thanks for all your input. It just helps to talk about this stuff sometimes. :thumbup:
Ok. I took it to a guy and he says its got to be a bad converter. I will find out for sure tomorrow. He is going to put a new one in.
I guess I could do that myself but it sucks to do transmission work in the dirt. I will just let him do it!
Just for some closer to this thread. I had the converter replaced and the problem came back that day! He said it was a bad part.. Its doing fine now. I think.. That was the first time I ever had to go to a mechanic. This truck is a POS! :smash:
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