yesterday i installed my weapon r intake and i had a problem with getting the sensor in, which i will fix today. but anyway, today when i got up to go to school i realized my check engine light came on and i thought it was bc of the sensor but on the way to school i realized it shifting really hard and i didnt know if that could possibly be cause by the sensor not being properly in place, if someone can help me out that would be great, would fixing the sensor fix it? would doing a tranny flush fix it? its a 2.2 eco and it has 74k miles on it
The IAT sensor has a direct effect on the shift pressure and shift thresholds. You need to install the iat.
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Whalesac why does the IAT involve the trans?
GM wrote the programing that way, but it pisses the 4T40-E off completely if it is not working correctly, or not installed. The trans shifts HARD, and sometimes doesn't want to up-shift or down-shift.
PRND321 Till I DIE
Old Motor: 160whp & 152ft/lbs, 1/4 Mile 15.4 @88.2
M45 + LD9 + 4T40-E, GO GO GO
Because the car goes into limp mode when the IAT sensor is left out. Figured that out when I first installed my short ram way back when
Cruisin4DrCav wrote:Because the car goes into limp mode when the IAT sensor is left out. Figured that out when I first installed my short ram way back when
I believe this is the case (I always have a check engine light, so I don't know for sure).
If you drive around without an IAT (sadly I am), then the transmission shifts hard into every gear. It would make sense from a limp mode standpoint, because with a higher line pressure, this keeps the clutches from overheating. However, I personally don't see why if the engine is in limp, that the computer should ignore the CLT and TFT sensors and just throw the Transmission control side into limp as well, since the IAT really has no real purpose to transmission control.......It seems like lazy engineering to me
Also, I don't know if maybe I had forgotten to hook up my TPS to the Jbody pcm (probably the case), but the car doesn't downshift under WOT, it upshifts no higher than 3500rpm in every gear and tcc lock comes on sooner than usual.
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Interesting. I talked to my brother about this also. Said it goes into limp mode and sends a fasle reading of -40 degrees. In which case what does it effect to the engine? More fuel, less fuel? Maybe more fuel because it wants to warm the engine up. Wouldn't this hurt performane and cause the engine to run rich? Maybe its the other way around??
When I first installed my intake pipe the hole was to small for the sensor. I just left the sensor plugged into the harness and let it hang there until I did the proper fix.
Well just unplugged it, went around the block WOT. I felt a little difference in the shift. And it ran really rich. I'll keep it plugged in.
