Originally Posted by sse1990
Simple question. Besides the ECM( I think) what else would control the shifting into OD on my 90 SSE? Reason I am asking is that it seems that since the engine blew, you have to drive faster before it will engage into OD. It used to engage at about 80km/h (50mph), and now you have to get close to 90km/h ( 55mph).
Also one thing that I wondered about since we got the car is that once it is on OD and you go up a slight hill, you press on the gas more and the rpms drop more and the car still increases in speed, but if you let off pressure just a bit, the rpms jump back up. Which is why I always thought it was line pressure or lack there of.
Could these be related?? Also is there anyway to adjust when the OD kicks in??
You are looking at 2 diffrent situations...
Ok, for the OD and the RPM'* dropping, that is the TCC coming in and out of play... It depends on the speed and the amount of engine load, that the ECM will lock and unlock the TCC.. If you let off the gas and reapply your foot, the TCC will then be unlocked, when the speed and load are right again the TCC will lock up again.. And sometimes it will lock with your foot on it a bit... You'll see the RPM'* drop like a rock, most likely feel it a bit too...
For the second it sounds like you need to adjust the Throttle Valve cable or TV cable... If the adjuster is out one notch too far it can cause all of the shifts to be delayed say 5-10 MPH.... Or KPH.... Have you noticed some slightly higher shift points?
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