Lousy EFI tuning= bad shifting - Chevy and GMC Duramax Diesel Forum
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Old 02-16-2012, 04:11 PM   eBay Motors  #1 (permalink)
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Lousy EFI tuning= bad shifting

Just like the topic says. Could lousy EFI tuning cause erratic/ lousy shifting? It especially shifts very erratic at lower speeds. (in town driving) it does hiccup some when I boot it in the ass at higher speeds. This all seemed to happen right after I got some new tunes a few months ago.
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Old 02-16-2012, 05:34 PM   eBay Motors  #2 (permalink)
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Anyone?
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Old 02-16-2012, 05:36 PM   eBay Motors  #3 (permalink)
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Contact your tuner?
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Old 02-16-2012, 05:37 PM   eBay Motors  #4 (permalink)
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Who tuned it?


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Old 02-16-2012, 05:38 PM   eBay Motors  #5 (permalink)
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A local guy did... yeah it was a bad idea looking back on it now, thats why I have tunes being built by Idaho Rob right now.... But could bad tuning cause shifting issues?
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Old 02-16-2012, 05:42 PM   eBay Motors  #6 (permalink)
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I'm sure it could.


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Old 02-16-2012, 05:54 PM   eBay Motors  #7 (permalink)
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Hmmmm, Im hoping thats all it is is bad tuning. I'm sure if it is, when I get my new tunes from ATP, it will shift better. If not, I'm not gonna be too happy if I have transmission issues already with 5000 miles on the rebuild.
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Old 02-16-2012, 06:00 PM   eBay Motors  #8 (permalink)
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It is bad tuning. I played with mine a little here and there and a couple tunes I screwed with the wrong stuff. It made my transmission very unhappy.
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Old 02-16-2012, 06:03 PM   eBay Motors  #9 (permalink)
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Well, if you're right, which I hope, and assume you are, having been through it, then that is good news. Thanks
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Old 02-16-2012, 06:09 PM   eBay Motors  #10 (permalink)
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probably has a crazy % defuel tuned in and its makes it shift like chit
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