Allison stalling between 1st & 2nd Gear - Please Help - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 14 (permalink) Old 01-20-2010, 12:51 PM Thread Starter
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Allison stalling between 1st & 2nd Gear - Please Help

when i don't come to a complete stop (approx. 7-12mph) at a stop sign then accelerate. the truck stalls and hesitates. it's dangerous. 2002 allison 5 speed, 8.1L 2500HD, all stock no chips or mods. please help?
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post #2 of 14 (permalink) Old 01-21-2010, 02:29 AM
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check your fluid level?

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post #3 of 14 (permalink) Old 01-21-2010, 03:09 AM
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Did this start all of a sudden? Or been doing it for a while? Is the check engine light on? Any codes?

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post #4 of 14 (permalink) Old 01-21-2010, 03:39 AM
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How many miles on the truck and when was the last spin-on change/service? As Rob asked, any lights/codes?

It happens sometimes when an Allison is really cold, low on fluid or has a dirty filter causing the line pressure to drop due to lack of fluid getting to the pump.

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post #5 of 14 (permalink) Old 01-21-2010, 12:53 PM Thread Starter
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no engine check light, fluid level is good, i changed trans fluid and filter at 25,000 ago with synthetic. it only hesitates between 1st and 2nd. and only when i decelerate to 7-12mph then accelerate. it's in the process of gearing down and then i gun it and it's in between gears and doesn't know to grab 1st or 2nd. 1st gear in these allisons is like a GRANNY gear.
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post #6 of 14 (permalink) Old 01-21-2010, 06:47 PM
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hmm well maybe the adaptive learning system isnt used to being used like that and hasn't been able to comensate for it, how often does it happen? and does it happen every time you do that? the allison is sometimes too smart for its own good

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post #7 of 14 (permalink) Old 01-22-2010, 02:03 AM
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Quote:
Originally Posted by 2002Allison View Post
no engine check light, fluid level is good, i changed trans fluid and filter at 25,000 ago with synthetic. it only hesitates between 1st and 2nd. and only when i decelerate to 7-12mph then accelerate. it's in the process of gearing down and then i gun it and it's in between gears and doesn't know to grab 1st or 2nd. 1st gear in these allisons is like a GRANNY gear.
How many miles on the Allison?

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post #8 of 14 (permalink) Old 01-22-2010, 01:13 PM Thread Starter
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it stalls and hesitates every time if the exact condition. thanks for your help
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post #9 of 14 (permalink) Old 01-22-2010, 01:15 PM Thread Starter
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97000 miles on truck and allison. i bought new and haven't abused or modified. all stock.
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post #10 of 14 (permalink) Old 01-22-2010, 01:17 PM Thread Starter
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it has been doing it for a very long time. a couple of years at least.
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