Noisy DBW Throttle Body - The 1947 - Present Chevrolet & GMC Truck Message Board Network

thehata1 · 03-26-2019, 11:34 PM

I'm trying to wrap up my swap and started it for the first time last weekend. I noticed that when I turn my key into the run position, my DBW throttle body powers up or engages loudly. The engine, tac and peddle came from the same truck. I drove that truck for 6 months and never really heard it before.

Any thoughts?

ls1nova71 · 03-27-2019, 04:05 AM

It's normal for them to make some noise when you first turn them on. How loud is it?

homemade87 · 03-27-2019, 06:45 AM

If you have the air intake off you can here it pretty good . This is normal . It does a little quick test open and close to check to see if there is a problem with the tb binding . If it detects a slight resistance it will throw a code and will not open the tb after starting the engine .

This is GM fail safe test so you dont have a stuck open tb and a run away engine .

thehata1 · 03-27-2019, 10:52 PM

Quote:

Originally Posted by homemade87

If you have the air intake off you can here it pretty good . This is normal . It does a little quick test open and close to check to see if there is a problem with the tb binding . If it detects a slight resistance it will throw a code and will not open the tb after starting the engine .

This is GM fail safe test so you dont have a stuck open tb and a run away engine .

The factory air intake is on it. And, after crank up, you can rev the motor. I posted a link to a video with the sound just before this post.

thehata1 · 03-27-2019, 10:51 PM

Quote:

Originally Posted by ls1nova71

It's normal for them to make some noise when you first turn them on. How loud is it?

You can here it at the very beginning of the video posted to my ig account: https://www.instagram.com/the_not_asian_caucasian/

To me it's as loud as a starter engagement. But, you can put your hand on the tb and it's definitely it.

Wildkarde · 03-28-2019, 12:34 AM

Thats perfectly normal. Its a sound you really get used to when tuning them, as evey time you load a new calibration it cycles the computer.

**Wgesnerjr** · 03-28-2019, 06:05 AM

yes, normal sound out of mine. running that way for almost a year, no problems.

thehata1 · 03-28-2019, 12:02 PM

Quote:

Originally Posted by Wildkarde

Thats perfectly normal. Its a sound you really get used to when tuning them, as evey time you load a new calibration it cycles the computer.

Quote:

Originally Posted by Wgesnerjr

yes, normal sound out of mine. running that way for almost a year, no problems.

Thanks guys. I just never noticed it in the other truck.

03-26-2019, 11:34 PM	#1
thehata1 Registered User Join Date: Dec 2017 Location: Mile High Posts: 160	Noisy DBW Throttle Body I'm trying to wrap up my swap and started it for the first time last weekend. I noticed that when I turn my key into the run position, my DBW throttle body powers up or engages loudly. The engine, tac and peddle came from the same truck. I drove that truck for 6 months and never really heard it before. Any thoughts?

03-27-2019, 04:05 AM	#2
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,119	Re: Noisy DBW Throttle Body It's normal for them to make some noise when you first turn them on. How loud is it? __________________ My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html

03-27-2019, 06:45 AM	#3
homemade87 Registered User Join Date: Apr 2010 Location: Guntersville Alabama Posts: 1,073	Re: Noisy DBW Throttle Body If you have the air intake off you can here it pretty good . This is normal . It does a little quick test open and close to check to see if there is a problem with the tb binding . If it detects a slight resistance it will throw a code and will not open the tb after starting the engine . This is GM fail safe test so you dont have a stuck open tb and a run away engine .

03-28-2019, 12:34 AM	#6
Wildkarde Registered User Join Date: Mar 2018 Location: Ardmore Posts: 100	Re: Noisy DBW Throttle Body Thats perfectly normal. Its a sound you really get used to when tuning them, as evey time you load a new calibration it cycles the computer.

03-28-2019, 06:05 AM	#7
Wgesnerjr Senior Member Join Date: Jun 2015 Location: Atlanta, GA. Posts: 737	Re: Noisy DBW Throttle Body yes, normal sound out of mine. running that way for almost a year, no problems. __________________ Jay Gesner Atlanta, GA 1985 C10 Long Bed 4X2 LS 5.3, 4L60E Father/Daughter Project



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