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Originally Posted by jeffcoslacker
It almost sounds like the TCC is beginning to drag a little.
No, you have to really be in the car to tell, and im sure you would agree if you were, it isnt dragging im sure, ill swear/gaurentee its the IAC slowing the idle even more, why i have no clue.
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The actual lockup mechanism, I mean, not the solenoid. Does it do it when you first start driving? Cuz the lockup shouldn't be active until full operating temp is reached.
Well i dont think it does it (except for the slow idle) when cold, i have a drive long enough from my house that by the time i cab reach 40, car is already warm.
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You could unplug the TCC, let it cool overnight and drive it with it disabled the next day, see if the drag on your idle at a stop is gone. Then you'd know what you got
Actualy i did unplug it, and tranny acts fine, shifts fine, but the slow down at a stop is still there.I dont think from way it feels it is the tranny causing the slowdown, Feels like the IAC actually slows it
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The only other thing I wonder is, possible in any way that you just never noticed that aspect of the idle before this other started happening? I ask because in the shop, when I'd have one running on a lift in nuetral, the wheels turn, fluid motion causing residual movement in the gears and things. When I'd grab the tires and stop them from moving, the idle would momentarily "gag", then idle down slightly. I always assumed it was because it put a slight amount more load on it to not be able to turn the parts anymore, having to "fight" them with fluid pressure instead of having them move with it. I suppose this could be related to the VSS, that's one sensor I never had occaision to deal with.
No i know it never did this before, but i also did drive it a long time with the IAC unplugged because i assume the MAP was goofy and car would always idle real high, driving or sitting still. Now that i replaced all the sensors, i wanted it all to work right, and thinking back, it did untill the last thing i replaced, it MAP, thats about when the idle drop, and weird tcc crap started happening.
I supose the idle slow down could be normal and didnt before because the IAC was unplugged and or one of the other sensors were bad, and now its "normal" I can live with the slowdown if its "normal" just aggrivating not knowing if its a indeed a malfunction.
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I had a lady describe exactly what you are describing right before her TCC began failing to unlock completely. I wonder. And it was not the solenoid, she'd had it replaced a couple of months before. This was the torque convertor actually going bad.
I spose it could be the convertor going bad, BUT. (see below)
Anyhow, what I was getting at on the other reply is the convertor should LOCK when coasting or cruising, UNLOCK when you give it power or start up a hill. The reason being that the slip when unlocked allows additional torque by way of allowing higher RPM"s same road speed.
That is exactly how it works, just like it is sposed too, but only if there is a slight throttle/slight hill that the car is going up. See i drive the same route every day, and ya learn the cars habits after awhile as i am sure you know, several "hills" that it would start up at 55, and slow due to the incline to about 40 without moving throttle, the convertor would hold till i slowed to 40 and unlock, it still does that exactly the same as before.
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BUT!
Then when load is nuetral (cruising) it locks, allowing for better fuel mileage by eliminating slippage and decreasing RPMs relative to road speed.
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