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Go Back   Dodge Cummins Diesel Forum > 2nd Gen. Dodge Cummins 94-98 12V Forums > 94-98 Powertrain
94-98 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect...NO ADVERTISING

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Old 11-13-2009, 11:52 AM   #1 (permalink)
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Truck acting wierd when cold!

OK I have a 96 12v, and everytime I crank it up in the morning and put it in drive, It acts like it chokes down for a couple seconds the idles back up?

What could be causing this?
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Old 11-13-2009, 02:04 PM   #2 (permalink)
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could be the alt loading up as it is powering the intake heater grid.
Watch your volts when it "chokes down" you'll see they are lower than normal and the gauge will probably be moving slowly one way or the other.
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Old 11-13-2009, 02:13 PM   #3 (permalink)
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I noticed the same thing when it started getting colder so I tested and found the exact answer
working as intended FTW it never does it later in the day when the engine or outside temp is much warmer
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Old 11-13-2009, 03:06 PM   #4 (permalink)
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Mine always did that when it was really cold and I was told it was because of the transmission fluid being too cold so it got thick
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Old 11-13-2009, 06:11 PM   #5 (permalink)
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ok well lol how do I get it to stop
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Old 11-13-2009, 06:17 PM   #6 (permalink)
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Park in a heated garage.
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Old 11-14-2009, 10:27 AM   #7 (permalink)
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If it's because of the transmission when you first start it in the morning set the e-brake and put it in neutral. I will generate some heat inside the transmission. I was told it's in neutral fluid is still moving inside the transmission and if it's in park the fluid isn't moving at all.
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Old 11-14-2009, 10:35 AM   #8 (permalink)
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Is this something that just started all of a sudden? Has anything been done lately to engine or trans? What is idle? If idle is too low, when everything is cold it will choke down to the point of cutting off. Once up to temp, it will stay running. If all else fails, bump the idle just a bit.

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Old 11-17-2009, 11:53 AM   #9 (permalink)
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now when I go to stop sometimes it seems like it wants to choke down!
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Old 11-17-2009, 01:15 PM   #10 (permalink)
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air in the fuel system
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Old 11-18-2009, 01:04 PM   #11 (permalink)
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air in the fuel system? what you mean?
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Old 11-18-2009, 02:00 PM   #12 (permalink)
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These trucks are notorious for leaking air into the fuel lines. Sometimes the lines corrode or sometimes it's back at the tank pickup/sending unit.

If you are sucking air into the lines back at the tank it will start properly and then stumble when the air makes up to the injectors. I have seen that with my 96 and it becomes more pronouced when it is cold as the diesel becomes that much harder to pump. Even at moderate temps it is much easier for the pump to move air than fuel. So if there is any air leak it will normally be worse in cold temps.

As well, as the truck sits if there is even a tiny air leak in the feed line it will eventually allow the fuel in that line to move back to the tank as air displaces the diesel. So, a tiny leak does not cause a noticeable power drop when running but will present itself after sitting for a period of time.
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