Why Do Our Trannies Shift Like Crap in the Cold? - DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat
 
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post #1 of 14 (permalink) Old 01-17-2009, 02:35 PM Thread Starter
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Why Do Our Trannies Shift Like Crap in the Cold?

I know I know, it isn't a problem, just a Dodge thing. I have wondered why they do this. When it is in the 30's I get a nice supercharger whine for about the first mile. When its in the 20's the first few shifts almost feel like it disengages the clutch, reengages it, then shifts lol. When it gets between like 0 and 15 degrees, it is really jerky like it is running out of gas for the first 500 feet or so. Lower than that, and it doesn't go into 4th gear.

Any idea why they do this? Again, I know its nothing bad, just kinda wondering. My theory is that since they are very sensitive to the type of transmission fluid. Since the fluid is more viscous at lower temps, the transmission does not take this into account.

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post #2 of 14 (permalink) Old 01-17-2009, 03:02 PM
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Not sure but the past few mornings I noticed that if I leave in A/S just after starting it will not shift to 2nd, in Auto its fine. A mile or 2 down the road and back to normal.
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post #3 of 14 (permalink) Old 01-17-2009, 03:22 PM
 
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I'll find the description of the self protection the tranny takes in the cold. It needs to posted every year about this time.
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post #4 of 14 (permalink) Old 01-17-2009, 03:29 PM
 
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This may give a little insight into the "just started" shifts you should expect.



TRANSMISSION CONTROL
SHIFT SCHEDULES
As mentioned earlier, the PCM has programming
that allows it to select a variety of shift schedules.
Shift schedule selection is dependent on the follow-ing:
Shift lever position
Throttle position
Engine load
Fluid temperature
Software level
As driving conditions change, the PCM appropri-ately
adjusts the shift schedule. Refer to the follow-ing
chart to determine the appropriate operation
expected, depending on driving conditions.
Schedule Condition Expected Operation
Extreme Cold Oil temperature at start-up below
-16 F
Park, Reverse, Neutral and 2nd
gear only (prevents shifting which
may fail a clutch with frequent
shifts)
Cold Oil temperature at start-up above
-12 F and below 36 F
– Delayed 2-3 upshift
(approximately 22-31 mph)
– Delayed 3-4 upshift (45-53 mph)
– Early 4-3 costdown shift
(approximately 30 mph)
– Early 3-2 coastdown shift
(approximately 17 mph)
– High speed 4-2, 3-2, 2-1 kickdown
shifts are prevented
– No EMCC
Warm Oil temperature at start-up above
36 F and below 80 degree F
– Normal operation (upshift,
kickdowns, and coastdowns)
– No EMCC
Hot Oil temperature at start-up above
80 F
– Normal operation (upshift,
kickdowns, and coastdowns)
– Full EMCC, no PEMCC except to
engage FEMCC (except at closed
throttle at speeds above 70-83 mph)
Overheat Oil temperature above 240 F or
engine coolant temperature above
244 F
– Delayed 2-3 upshift (25-32 mph)
– Delayed 3-4 upshift (41-48 mph)
– 3rd gear FEMCC from 30-48 mph
– 3rd gear PEMCC from 27-31 mph
Super Overheat Oil temperature above 260 F – All 9Overheat9 shift schedule
features apply
– 2nd gear PEMCC above 22 mph
– Above 22 mph the torque
converter will not unlock unless the
throttle is closed or if a wide open
throttle 2nd PEMCC to 1 kickdown
is made


Sorry about the abreviations, the manuals presume we are Chrysler techs.


EMCC Electronically Modulated Converter Clutch

FEMCC Fully Electronically Modulated Converter Clutch

PEMCC Partial Electronically Modulated Converter Clutch
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post #5 of 14 (permalink) Old 01-17-2009, 03:30 PM
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Jim is right. When the tranny fluid temperature is lower than certain threshold (FSM has a description), it will refuse to shift into higher gears, until things warm up.
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post #6 of 14 (permalink) Old 01-17-2009, 11:37 PM Thread Starter
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Wow. Never would have guessed it was supposed to do that! Thanks BigJim, that is very interesting.
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post #7 of 14 (permalink) Old 01-18-2009, 12:02 AM
 
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I may be an extremeist, but I start her up and let it sit till the temp guage moves. It seems to let it be a bit more predictable and safe when pulling into traffic without seeming to make the cold engine scream.

Remember there are NO stupid questions, ask away. No one knows it all but we do know alot of places to look.
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post #8 of 14 (permalink) Old 01-24-2009, 10:34 AM
 
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I have never noticed any problems in the cold, I started and drove in -6 degrees and my tranny shifted normal.... I did have a shifting issue with an 03 Durango I had, I had the fluid changed and it was fine..... might need to just change the fluid to new....
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post #9 of 14 (permalink) Old 01-24-2009, 12:35 PM
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Megatrep,mine does all of the above too on cold mornings. What I heard (not sure if its true or not) is when you start your car to let it warm up, put the tranny in neutral (obviously make sure it doesnt roll away) because its supposed to open the valves in the trans for quicker warm up, or somethin like that. I was told that by an old timer that probably heard that back in the day, i dont know. Its worth a try I guess.
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post #10 of 14 (permalink) Old 01-24-2009, 02:27 PM
 
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These trannys do not pump through the cooler in park, so there may be some merit to that.
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post #11 of 14 (permalink) Old 01-26-2009, 09:51 AM
 
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Hmm, at least you have more gears? I started mine, and let it run five minutes, drove it all the way to the bus stop (about 6 miles) and back, and still had nothing but PRN and 3. Which is great when I'm doing 4 grand at 50mph. I don't even have the auto stick...ugh, this makes me want a Ford more and more, or a buick.
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post #12 of 14 (permalink) Old 01-26-2009, 09:53 AM
 
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if that's the case, I'm screwed, I can't put mine in neutral, my E-brake is rusted.
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post #13 of 14 (permalink) Old 01-27-2009, 03:38 PM
 
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Mine actually shifts better in the cold (0-32 degrees), if you're talking strictly about the quality of the shifts. Yes, it stays in gear a little longer, and the lockup is prevented when it's really cold outside until the engine temp gauge is at least halfway up (no idea of the tranny oil temp).
My gripe is the 1-2 shift when it's warm. Sometimes OK, often rough.
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post #14 of 14 (permalink) Old 02-04-2009, 12:09 AM
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I guess the engineers place transmission warm up as pretty important.

When the engine is cold. I try to drive very gently on the throttle. With that in mind I did notice it upshifts a bit late. My mission was to actually make it upshift early to keep the rpm's down.

I did also notice that no torque convertor lock up until things are warmed up. When I leave work I'm on the highway in less than 3 minutes. If I set the cruise the rpm will hang about 2700 then after it warms up it will drop down to 2500 all at the same speed.

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