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| From | Message |
| Dan Krings Unregistered  1/01/2001 21:12:44 |
 Subject: Cold OD wont work?IP: Logged Message: I recently had an experience that nearly killed me in Minnesota. My father owns a 1998 Dakota with a 318 in it. We were traveling in northern Minnesota where it can be a long way between towns. We passed through Baudette with a half tank of fuel in the tank. Thinking we would easily make it the 60 miles to the next station, we happily went on our way. We got about 3/4 of the way there and noticed that the gauge was near empty and the engine was running at reletively high RPM. Well, we barely made it to the next town, but we could have been stranded in -30 degree F temperatures. The dealer told my father that the transmission will not shift into OD with temperatures below -5 F. In my opinion there should be HUGE warning stickers on these vehicles telling people not to buy them if you live in the nothern half of the US or in Canada. They are a safety hazard! This is pure stupidity, how do they hope to compete with GM, Ford, and the foriegn competitors with this idiotic setup? |
| Bernd GenIII  1/01/2001 22:10:16 | RE: Cold OD wont work? IP: Logged Message: I guess, with this latest cold snap across the northern region...the problem will be addressed by DC. (When...that's anyones guess...DC is REALLY slow on stuff like this.) However, i'm checking with a few other lists to see if they have a fix for this. Since the transmission is obviously getting a signal from a simple thermistor...it shouldn't be hard to modify the signal to the PCM. Coolant Temp, IAT, Transmission Temp, and Battery Temp all use the same reference tables. I'm sure the sensor that's reading the -5 degrees is on the same table since it ranges from -40 - 295 degrees (with resistance values to match). Hang in there...if DC doesn't get on it...we will. ;) Bernd D. Ratsch 1997 Dodge Dakota SLT Supercharged w/Nitrous |
| Bob/ Unregistered 1/01/2001 22:16:58 | RE: Cold OD wont work? IP: Logged Message: Dan--Dodge is owned by a Foreign Company. Call 1-888-4adodge and tell them about there pure stupid idiotic setup! Bob/ |
| Bob/ Unregistered 1/01/2001 22:32:47 | RE: Cold OD wont work? IP: Logged Message: Bernd-- as I said in a past post to you,my 4.7L auto. would not shift to OD in-tell my t-stat opened all the way and my heat gauge read all the way to normal.My point is...if I would put a 180 t-stat in,would it shift like it is suppose to.I don't think it would.As I have told other posts,if you read your manual,it will tell you that a 4.7L auto. will not shift to OD in-tell it is up to heat. Bob/ |
| Bernd GenIII 1/02/2001 08:42:52 | RE: Cold OD wont work? IP: Logged Message: Bob, The sensor that controls this can be "fooled" into thinking it's warmer. I did read my manual and checked with several people who have 4.7L's. (Even my '97 FSM shows the Automatic/OD function is controlled by the Transmission Temp Sensor". One option is to cover the radiator with a "Radiator Blanket" and the other is fooling it electronically. Bernd D. Ratsch 1997 Dodge Dakota SLT Supercharged w/Nitrous |
| Bernd GenIII 1/02/2001 08:53:39 | RE: Cold OD wont work? IP: Logged Message: Here's one response from a person who also lives in that area: "If you let the truck sit and idle after you start it for 5-10 minutes, even if it is sub 0 out it will shift. At least mine does. On my trip home from work one day it would not shift for the whole 25 miles but the next day (same temp out) I let it warm up for 10 min before I started driving and it shifted within a mile. - Niles" Bernd D. Ratsch 1997 Dodge Dakota SLT Supercharged w/Nitrous |
| Tim Unregistered 1/02/2001 09:36:19 | RE: Cold OD wont work? IP: Logged Message: I live near Buffalo and my 99 also will not shift into OD on some cold mornings. But usually after 2-3 miles, it shifts into OD. Soon as the temp gauge starts to move, it shifts to OD. Anyone know why they do this?? The manual says its to prevent damage but i've never driven a vehicle before that does this. |
| Bob Dakota Enthusiast 1/02/2001 10:08:39 | RE: Cold OD wont work? IP: Logged Message: Fellows looks like I will have to talk to my dealer.This morning I let it warm for 15 min and it is 15+ out side...ones again it would not shift tell the heat did it's thing.My Dak takes a long time to open that t-stat...maybe it is because I have a trans cooler and HD cooling.My 1999 Plymouth van with a 3.8L does not take long to heat up nor did my 1997 Ranger 4.0L take that long to heat up.I'm thinking(smell something burning)that my HD stuff takes much more time. 2000 DakotaCC SLT Plus 4.7L 235hp 355 L-Slip Auto. |
| Bob Dakota Enthusiast 1/02/2001 10:28:39 | RE: Cold OD wont work? IP: Logged Message: Bernd-I think I will live with the extra gas consumption...if it is going to save ware and tear on my big buck trans.In the long run it would be best to drive slower(if traffic will let me)if it will make my trans last longer. Thanks Bob 2000 DakotaCC SLT Plus 4.7L 235hp 355 L-Slip Auto. |
| Bernd GenIII 1/02/2001 11:59:41 | RE: Cold OD wont work? IP: Logged Message: I agree...you really shouldn't be driving at speeds fast enough to kick in the OD anyway in that cold of an environment. (Ice, Snow, Sleet, etc...nasty to drive on at higher speeds) I can understand why they (DC) built that into the transmission...but they should lower the temp rating a little bit though. Bernd D. Ratsch 1997 Dodge Dakota SLT Supercharged w/Nitrous |
| Dan Krings Unregistered 1/02/2001 22:50:32 | RE: Cold OD wont work? IP: Logged Message: Bernd: In general, I would agree that driving too fast is bad in cold conditions. However, if any of you have driven in cold climates before you would know that the roads are often clear and dry when it is very cold outside. I see no reason that speed should be limited to under 40MPH (OD effective engagement speed if I understand correctly) when the roads are dry as a bone. Besides, If this feature was truely necessary in a well designed vehicle, why have I never seen in it? |
| Bernd GenIII 1/03/2001 00:20:04 | RE: Cold OD wont work? IP: Logged Message: I have driven on icy/snow covered roads many times and the speed was never higher than 40mph. It's a safety thing. Yes, they do clear the roads but I normally let the people driving 60+mph pass me (i'm still at no more than 45mph). As I said..."I can understand why they (DC) built that into the transmission...but they should lower the temp rating a little bit though. " Bernd D. Ratsch 1997 Dodge Dakota SLT Supercharged w/Nitrous |
| Bernd GenIII 1/03/2001 00:37:47 | RE: Cold OD wont work? IP: Logged Message: Here's a little test Bob: If you look at chart #J928D-4 in the FSM, you'll see the resistance values for the thermistor (aka: Temp Sensor). They're the same for the Coolant and Intake Air Temp. If you want to try a little test, just disconnect the sensor lead from the transmission and insert a 10K Resistor (1/4watt will do) into the connector to the PCM. This fakes the PCM into thinking that the transmission temp is at roughly 75 degrees. I do the same in my little "Project Box" but with a 10K POT on the IAT (along with a few other goodies) and am able to control the timing and fuel mixture within a 4 degree range. And it doesn't trip a MIL. Posted also to the Mopar Chat forum. Bernd D. Ratsch 1997 Dodge Dakota SLT Supercharged w/Nitrous |
| Zed Unregistered 1/03/2001 09:12:11 | RE: Cold OD wont work? IP: Logged Message: Its still gay that it won't shift into OD for so long....Why don't most other vehicles do it?? Are dodge tranmissions so weak that they need this safety feature to protect them??? |
| Bernd GenIII 1/03/2001 10:17:37 | RE: Cold OD wont work? IP: Logged Message: You don't want to run in OD on a very cold transmission...ruins things rather quickly. Other manufacturers do the same thing. Bernd D. Ratsch 1997 Dodge Dakota SLT Supercharged w/Nitrous |
| Bob Dakota Enthusiast 1/03/2001 11:12:50 | RE: Cold OD wont work? IP: Logged Message: Dan-I think Bernd mis under stood me about driving in the cold,I meant to say that I will drive slower in tell the OD kicks in...big waste of gas.I have a new twist to the cold OD shifting.Bernd I think I shot down your rad. Blanket idea.This morning it was 11 degrees,I let the engine ideal for 20 min.The heat gauge read normual,but the trans took 2.05 miles to shift to OD,me driving the posted speed of 50 mph.My trans always shifts to OD at 45 mph when hot. Thanks-Bob 2000 DakotaCC SLT Plus 4.7L 235hp 355 L-Slip Auto. |
| Bernd GenIII 1/03/2001 11:23:25 | RE: Cold OD wont work? IP: Logged Message: Try the resistor...that's it you want to "test it out for me". ;) Bernd D. Ratsch 1997 Dodge Dakota SLT Supercharged w/Nitrous |
| Bob Dakota Enthusiast 1/03/2001 11:59:30 | RE: Cold OD wont work? IP: Logged Message: Bernd thanks for the research,but I think I will pass on the test,(knowing myself)...I would fudge somthing up. Bob 2000 DakotaCC SLT Plus 4.7L 235hp 355 L-Slip Auto. |
| Mn_Matt Dodge Dakota JOIN HERE 1/30/2004 10:34:29 |  RE: Cold OD wont work?IP: Logged Message: I have a '98 v6 automatic. This last week has been very cold in Minnesota. This morning was -24 below. I let the truck warm up for 25 minutes and then started driving. I have a 25 mile drive to work, 10 miles from home I run into a town where I have to reduce speed from 55 down to 30mph. The truck will shift fine from home to the town in the middle. Once I leave that town and start the next 15 miles of my commute the truck will not shift into OD. Any Ideas? |
| gen1dak Dodge Dakota JOIN HERE 1/30/2004 19:59:13 | RE: Cold OD wont work? IP: Logged Message: The pcm will not lock the converter or engage overdrive til the tranny temp is 50 degrees Farenheit. This has been standard on Mopar overdrives since day one. A simple piece of cardboard or something else partially blocking airflow to the radiator will allow normal operating temp for engine and transmission to be reached. This will allow full transmission function. It's in the owners manual. |
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