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Old 07-26-2019, 10:33 PM   #1
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Default Chevy Express 3500 tuning

I have a Chevy Express 3500... it's supposed to tow like a champ.

It doesn't.

My mechanic isn't seeing anything obviously wrong and without a trailer load, it moves at a good clip (though not as good as my mustang gt...clearly). Under load, it seems to bog down.

I thought that perhaps a tuner may help. Maybe a tuner could diagnose the problem or provide a better tuning? Is this a crazy thought?

If this isn't crazy, does anyone know a good tuner near the Southside of Chicago that works on tow vehicle?
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Old 07-26-2019, 11:31 PM   #2
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Soooo like what motor
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Old 07-27-2019, 05:40 AM   #3
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Probably a 6.0? But unfortunately could also be a 4.3 v6
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Old 07-27-2019, 07:40 AM   #4
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VIN number says it's a 6.0L.
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Old 07-27-2019, 08:29 AM   #5
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Well, 6.0's pull terrible. So, sounds about right.
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Old 07-27-2019, 08:47 AM   #6
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How much weight are you pulling?
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Old 07-27-2019, 09:20 AM   #7
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How much are you towing with it
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Old 07-27-2019, 12:02 PM   #8
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Pulling a 4500# travel trailer (dry weight) and a van full of kids.

Any thoughts on the tuning?
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Old 07-27-2019, 12:14 PM   #9
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Boost...
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Old 07-27-2019, 01:46 PM   #10
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https://boostdistrict.com/collections/truck-kits
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Old 07-27-2019, 01:48 PM   #11
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Is my idea to get it tuned stupid?
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Old 07-27-2019, 01:53 PM   #12
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It may help, my dad has a bone stock 2500hd with a 6.0 and pulls a 10500lb boat across the country just fine, maybe there’s an actual issue with the motor, you could test fuel pressure under load and see if the pump is weak but not dead yet, if it’s high miles check the plugs and wires maybe just do a full tune up
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Old 07-27-2019, 05:07 PM   #13
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What rear end?
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Old 07-27-2019, 05:38 PM   #14
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Is this 4l80 4l85 or what?
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Old 07-27-2019, 05:39 PM   #15
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Maybe look into duramax powered one?
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Old 07-27-2019, 09:21 PM   #16
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Quote:
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Well, 6.0's pull terrible. So, sounds about right.
Wat
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Old 07-28-2019, 07:07 AM   #17
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Wat
Yup
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Old 07-28-2019, 10:51 AM   #18
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I've looked into a duramax...short of getting custom new, hard to find a Duramax passenger.

My van has the specs I want... If only it'd work right.
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Old 07-28-2019, 11:16 AM   #19
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What yea is it?
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Old 07-28-2019, 11:33 AM   #20
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2006. 75k miles. Used to be a corporate fleet shuttle, I think.
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Old 07-28-2019, 12:03 PM   #21
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i think you need to focus on what gears.
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Old 07-28-2019, 12:54 PM   #22
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Quote:
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2006. 75k miles. Used to be a corporate fleet shuttle, I think.
Let's see the RPO codes... Post a photo.
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Old 07-28-2019, 01:44 PM   #23
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My rpo codes
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Old 07-28-2019, 02:35 PM   #24
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Hmm. 3.73.
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Old 07-29-2019, 06:47 AM   #25
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whompwhomp
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