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TOPIC: Need help with 2008 Sierra 1500

Need help with 2008 Sierra 1500 06 Jul 2019 19:04 #1

  • Scott Castleberg
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Yes, it's been a while... Ok, now, grooving a drive by wire throttle body is different. Took it off and, ok, where does the groove go and not mess with the idle.

Thanks for the help. Tried to search the forum, but couldn't find what I needed.
Scott Castleberg
Gadgetman Pellston MI

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Need help with 2008 Sierra 1500 07 Jul 2019 13:28 #2

  • GregK
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I hope you didn't clean the TB.
You've no doubt seen mention here of the "business card trick" - use a business card (sometimes folded) to wedge the throttle place in the position it sits at hot idle. the carbon on the manifold side of the TB will leave a nicely shaded line around where the opening is, and you want to place the groove just downstream into where the dark solidifies.
Does that help?
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Need help with 2008 Sierra 1500 07 Jul 2019 15:12 #3

  • Scott Castleberg
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Yes, that helps. Forgot about the business card trick. Have not cleaned the TB, saw the line where the "turbulence" begins. I may have to add some reinforcement to the outside surface where the groove will go, as it looks too thin to use the big bit. Will keep you posted.
Scott Castleberg
Gadgetman Pellston MI
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Need help with 2008 Sierra 1500 07 Jul 2019 16:32 #4

  • GregK
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Awesome.

Go big/deep right off the hop: you’ll have plenty of shavings to fix any punctures with them in JBWeld if you do cut through. (Also consider shaping the throttle plate after you’ve cut the groove...)

I thought the same thing about the bore thickness before I grooved my 2007 Buick, but it turned out I was being overly cautious (I had to grind it off to get the coolant bypass tube to fit correctly).

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Need help with 2008 Sierra 1500 07 Jul 2019 16:43 #5

  • Scott Castleberg
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Ok. "Newbie" here. Define shaping the throttle plate.
Scott Castleberg
Gadgetman Pellston MI

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Need help with 2008 Sierra 1500 07 Jul 2019 17:05 #6

  • Ron Hatton
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As you all well know, I share EVERYTHING I learn... It took about five seconds to find this on YouTube, just looking for "Gadgetman Groove".
Ron Hatton
Developer of The Gadgetman Groove
Smile for a stranger today.
You will both be glad you did.

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Need help with 2008 Sierra 1500 07 Jul 2019 20:18 #7

  • Scott Castleberg
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Thanks Ron! That was an old, but good video. I will take my TB off tomorrow at work and groove, shape, reset fuel trims. I hope all is well with you at the"bottom" of Lake Michigan.
Scott Castleberg
Gadgetman Pellston MI

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Need help with 2008 Sierra 1500 07 Jul 2019 20:51 #8

  • GregK
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The Hatton to the rescue once again, verifying his Google-fu...
I have a feeling that this “extra touch” hastens the creation and/or enhances the effect/strength/longevity of our Groove when we start moving the plate from its idle position. I believe it came from NASCAR, where they found an increase in torque (or something else beneficial) as I recall.

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