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  #1  
Old 10-18-2010, 12:27 AM
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Default low line pressure? Transmission hesitation.

I have a 2008 6.7 Resistol with the 6 speed auto.

The transmission has always acted strangely, when cold the truck will not move until warmed up a bit. The transmission simply wont engage, it is in gear, however not grabbing. My dads 08 will immediately surge forward, mine....not so much.

Once warmed up it works fine, there are not other issues whatsoever. However would need to rev the cummins to nearly 2300 rpm to move either forward or reverse if just started.

I have taken it to the dealer (I am Canadian with a US truck, so no warranty up here) and of course the truck is warm even after sitting a couple hours and shows no symptoms.

Any ideas or suggestions?
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Old 10-18-2010, 08:39 AM
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Sounds like the transmission is losing it's prime. Have you checked the TCM for any codes? If there aren't any, you may want to drop the trans pan and check for a cracked/damaged filter.
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Old 11-05-2010, 03:57 PM
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Not meaning to jump this thread, but I have a similar problem on a 2003 Cummins TD that I had changed the transmission oil and filter on a while before it started doing this. After a couple thousand miles of towing, it has started to do this business of refusing to move forward when first start the engine. When I shift it into D it just sits there, return to R then to D and it usually is ready to move, but slowly. Then it begins to work fine. If I shut it off just over night, no problem, but if it sets a week, it does it again. It is parked nearly level, but not perfectly level so one time I pulled it onto the garage apron (level) and checked the oil, it showed way too much oil - so I used a vacuum pump to remove it until it was half way on the stick. Then I took it out for a mile drive and rechecked - ok. Then I parked it for several days and repeated the check. It was now a quart low - about what I had taken out! Is this symptom indicative of anything? Related at all to losing prime?

Thanks!

Last edited by jdubya; 11-05-2010 at 04:01 PM.
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Old 11-05-2010, 04:03 PM
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It certainly could be. That would explain the higher fluid level you experienced. You could have a stuck check valve in the cooler line which could cause the converter to drain back into the pan.
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Old 11-05-2010, 04:28 PM
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Is this dangerous to the transmission? How can I fix it?
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Old 11-05-2010, 05:09 PM
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I'm not aware of any long term effects but it sure is annoying. If it's a check valve, it would somply be a matter of replacing it.
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Old 11-06-2010, 12:35 PM
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Yes they are replacable . My rebuilder told me to do away with it . Says they do more damage then good . I'm running without mine now . No real issues .
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