Tranny wont go in OD when cold
#1
02-17-2008, 11:03 PM
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Tranny wont go in OD when cold
Hey All,
Got an 07 FX4 5.4. I live in north Illinois and when its coldout(below 20) the Transmission doesn't want to go in to overdrive untill the engine and trans warm up then it works like a champ. Talked to the dealer who said it sounded reasonable. Anyone else had this problem?
Thanks
HTCSUSN
Got an 07 FX4 5.4. I live in north Illinois and when its coldout(below 20) the Transmission doesn't want to go in to overdrive untill the engine and trans warm up then it works like a champ. Talked to the dealer who said it sounded reasonable. Anyone else had this problem?
Thanks
HTCSUSN
#3
02-18-2008, 12:40 AM
#4
02-18-2008, 07:14 AM
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02-18-2008, 10:04 AM
#6
02-18-2008, 10:39 AM
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Originally Posted by shawneeman
I like to leave my OD off for the first few miles until I hit the highway. Have an '04 and it does not get warm in the cab for a while compared to my other vehicles. So I leave off in order to warm up motor for better heating and also efficiency of engine when cold in the morning.
#7
02-18-2008, 10:59 AM
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Originally Posted by osbornk
There's no reason to turn the OD off. The computer does it for you. If I recall correctly, I read somewhere that the OD lockout when the engine is cold is to comply with emission requirements. Everything I have had for years has been that way. also, OD will not work until you speed is around 45 MPH.
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#8
02-18-2008, 12:44 PM
#9
02-18-2008, 01:04 PM
Per the Owners Guide:
Your vehicle’s automatic transmission is equipped with a special shift strategy that ensures maximum heater performance during cold weather operation.
When ambient temperature is 23°F (–5°C) or below and the engine coolant temperature is below 100°F (38°C), light throttle upshifts may be slightly delayed. Once the engine coolant temperature reaches 160°F (71°C) the normal shift strategy will resume. This is normal operation and will not affect the function or the durability of the transmission.
If the normal shift strategy does not resume once the engine coolant temperature reaches the normal operating temperature, or if the downshifts and other throttle conditions do not function normally, see your authorized dealer as soon as possible.
When ambient temperature is 23°F (–5°C) or below and the engine coolant temperature is below 100°F (38°C), light throttle upshifts may be slightly delayed. Once the engine coolant temperature reaches 160°F (71°C) the normal shift strategy will resume. This is normal operation and will not affect the function or the durability of the transmission.
If the normal shift strategy does not resume once the engine coolant temperature reaches the normal operating temperature, or if the downshifts and other throttle conditions do not function normally, see your authorized dealer as soon as possible.
#10
02-18-2008, 03:48 PM
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#11
02-18-2008, 06:23 PM
I did a test of my truck when it was cold and I thought like everybody here that it wasn't shifting into OD. But what happens is it doesn't lock the torque converter up.
The torque converter slipping is going to warm the trans up and also allow the rpm's to stay up.
Don't believe me test it for your self. Next time it's cold enough and you think it's not shifting into OD just switch OD off and see what happens.
The torque converter slipping is going to warm the trans up and also allow the rpm's to stay up.
Don't believe me test it for your self. Next time it's cold enough and you think it's not shifting into OD just switch OD off and see what happens.
#14
02-19-2008, 08:53 PM
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