I4 RPM Flair - Toyota Nation Forum : Toyota Car and Truck Forums

Rapid Roy · 09-21-2007, 04:45 PM

I have been noticing some odd transmision behavior. It happens on a slight incline, trany in 5th at 50mph or so. As I start to accelerate, I tip the shift lever to 4. Speed and RPM start to rise, and I shift back into D. At this point the RPM's jump 300 to 400 higher. The trans is still in 4th. If I shift back into 4, the RPM's drop back. Into D and the RPMs jump again. Is the transmision slipping or is this behavior some sort of tachometer malfunction. I can't hear any difference in engine noise, but I'm not accelerating very hard at all so I wouldn't expect to. Any thoughts?

Rapid Roy · 09-22-2007, 12:36 AM

Nobody else huh?

njerald · 09-22-2007, 12:54 AM

Quote:

Originally Posted by Rapid Roy

I have been noticing some odd transmision behavior. It happens on a slight incline, trany in 5th at 50mph or so. As I start to accelerate, I tip the shift lever to 4. Speed and RPM start to rise, and I shift back into D. At this point the RPM's jump 300 to 400 higher. The trans is still in 4th. If I shift back into 4, the RPM's drop back. Into D and the RPMs jump again. Is the transmision slipping or is this behavior some sort of tachometer malfunction. I can't hear any difference in engine noise, but I'm not accelerating very hard at all so I wouldn't expect to. Any thoughts?

Sounds like the torque converter is unlocking for 300-400 rpm difference.

I don't know about mine cause I don't dick around with it like that.................