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Is your Throttle Body grounded?


steve Galant VR4.org Administrator
Key Fob Guy


Galant VR-4 org Post #: 534548 posted 09/13/07 01:07 PM     Remind Me!  Send Private Message   Edit Post      
We were talking about this at the NY meet and even though I knew about this, I never realized that my car was missing the grounding bracket.

Basically, the t-body needs to be grounded because the closed-throttle-switch on the back of it needs a ground to tell the ECU the throttle is closed. Most of these cars are missing the bracket that normally grounds the t-body.

"Why does it need a bracket? Its bolted to the intake manifold!" you might say. The t-body is isolated from the manifold with a gasket. The bolts pass straight through the holes in the tbody into the manifold and may not make contact with the tbody it directly.

If your idle sometimes hunts up and down by about 200 rpm, or you're sometimes unable to adjust your keydiver adjustable stutterbox, or your adjustable stutter box seems to change settings even when you didn't change it, you probably have this problem. What you want to do is ground the t-body using the bolt in the top, per this example (which is also apparently missing any type of ground)




edited for easier searching


Edited by Minjin (09/13/07 01:40 PM)

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JNR
5 star (English Professor) member Has extensive pop up picture book collection
20/1000


Galant VR-4 org Post #: 534553 posted 09/13/07 01:10 PM     Remind Me!  Send Private Message   Edit Post      
Six steps ahead of you, sukka, ha ha...

Actually, I think I grounded the throttle switch itself, but it's been awhile and I have that other ground attached, although I have 'upgraded' to #8AWG, iirc.

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steve Galant VR4.org Administrator
Key Fob Guy


Galant VR-4 org Post #: 534555 posted 09/13/07 01:11 PM     Remind Me!  Send Private Message   Edit Post      
Yeah I figure there are a lot of people who don't know about this. First thread I went to in the Members Rides to look for a sample pic, didn't have any ground to the throttle body. I'm sure it will help a few people.



I know it's a foreign idea for most of us here, but you might want to try taking the car off jackstands.
-mitsuturbo

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boostedinaz
Fatty McButterpants
1101/2000


Galant VR-4 org Post #: 534566 posted 09/13/07 01:16 PM     Remind Me!  Send Private Message   Edit Post      
I have been having some similar issues with my Talon. Even though I know that the Tbody should be grounded I would have never thought to check it.



Michael
The rebuild of 1101

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CP
Still lingering, kinda like a chili and beer fart


Galant VR-4 org Post #: 534605 posted 09/13/07 01:51 PM     Remind Me!  Send Private Message   Edit Post      
My car does all that stuff. You ripped out some ground straps on Sunday when I wasn't looking, didn't you?



-Cy
Resident Spec Miata Racer | '93 Audi UrS4 | '04 Ram CTD | #1788/2000: SOLD

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steve Galant VR4.org Administrator
Key Fob Guy


Galant VR-4 org Post #: 534614 posted 09/13/07 01:59 PM     Remind Me!  Send Private Message   Edit Post      
I wanted to be helpful.



I know it's a foreign idea for most of us here, but you might want to try taking the car off jackstands.
-mitsuturbo

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gtluke
Fegbasket


Galant VR-4 org Post #: 534630 posted 09/13/07 02:16 PM     Remind Me!  Send Private Message   Edit Post      
thanks for the credit, pee hole bug



86gt pte67gtq
galant vr4 1464 12.83 @ 106
05sti, 400whp
00 2.5rs, for sale

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crankwalk
Unregistered


Galant VR-4 org Post #: 534668 posted 09/13/07 02:55 PM     Remind Me!  Send Private Message   Edit Post      
Sometimes the stutterbox changes settings so I should look into that.

Then again sometimes the car blows headgaskets...

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JohnG
Unregistered


Galant VR-4 org Post #: 534706 posted 09/13/07 03:32 PM     Remind Me!  Send Private Message   Edit Post      
Shit. My car does those things. Pretty sure I chucked that bracket when I installed my FMIC

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belize1334
well bread and nobly conceived
1334/2000


Galant VR-4 org Post #: 534793 posted 09/13/07 04:45 PM     Remind Me!  Send Private Message   Edit Post      
My problem is that the closed throttle switch works when the engine is cool but then becomes fickle when things warm up. I can't seem to get it adjusted correctly. Maybe this will help.



Roger B. Scott
'91 Belize Green

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Rigle1818
Unregistered


Galant VR-4 org Post #: 534851 posted 09/13/07 06:34 PM     Remind Me!  Send Private Message   Edit Post      
Yea my car idles really high when the car is moving even if i'm not touching the gas and I'm not in gear....then as soon as I stop the car is goes up and down a few times then very very!!! slowly settles to its normal idle...usually takes like 5-10 minutes. Maybe its because my ecu still thinks the throtle is open? I'll have to check into this to see if mine is grounded. This part might sound stupid but I just run a ground wire from the negative terminal to that bolt? Or from that bolt to a random grounding spot like a bolt in the firewall or on a wheel well?


Edited by Rigle1818 (09/13/07 06:42 PM)

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steve Galant VR4.org Administrator
Key Fob Guy


Galant VR-4 org Post #: 534855 posted 09/13/07 06:37 PM     Remind Me!  Send Private Message   Edit Post      
I circled a ground spot on the firewall.

My bad Luke. Luke brought this up and reminded me about it.



I know it's a foreign idea for most of us here, but you might want to try taking the car off jackstands.
-mitsuturbo

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Rigle1818
Unregistered


Galant VR-4 org Post #: 534857 posted 09/13/07 06:40 PM     Remind Me!  Send Private Message   Edit Post      
oh I didn't look at the pic that long my bad

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19psi
Unregistered


Galant VR-4 org Post #: 535018 posted 09/14/07 06:47 AM     Remind Me!  Send Private Message   Edit Post      
good one! i think that little bracket always disappears whenever i put an engine together and i never really thought about it.

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belize1334
well bread and nobly conceived
1334/2000


Galant VR-4 org Post #: 535137 posted 09/14/07 11:10 AM     Remind Me!  Send Private Message   Edit Post      
Are you talking about the piece that spans between the tb and the cas?



Roger B. Scott
'91 Belize Green

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CP
Still lingering, kinda like a chili and beer fart


Galant VR-4 org Post #: 535157 posted 09/14/07 12:03 PM     Remind Me!  Send Private Message   Edit Post      
From looking at that picture, why would you even need a bracket? Just run a wire from the TB to the firewall. That's what I'm going to do.



-Cy
Resident Spec Miata Racer | '93 Audi UrS4 | '04 Ram CTD | #1788/2000: SOLD

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steve Galant VR4.org Administrator
Key Fob Guy


Galant VR-4 org Post #: 535158 posted 09/14/07 12:04 PM     Remind Me!  Send Private Message   Edit Post      
Yup thats all you need to do. The bracket was the way it was done from the factory, but its not the only way. You can just run a wire to any ground point. The original bracket went from the point circled on the TB to the TB bolts that go through the elbow into the intake manifold. That way the TB was grounded through the bolt into the manifold.



I know it's a foreign idea for most of us here, but you might want to try taking the car off jackstands.
-mitsuturbo

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belize1334
well bread and nobly conceived
1334/2000


Galant VR-4 org Post #: 535166 posted 09/14/07 12:28 PM     Remind Me!  Send Private Message   Edit Post      
Huh, I don't remember that bracket ever being present on mine, and to my knowledge I was the first person to touch my tb. It was probably there and I just lost it. I'm awesome like that.



Roger B. Scott
'91 Belize Green

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steve Galant VR4.org Administrator
Key Fob Guy


Galant VR-4 org Post #: 535180 posted 09/14/07 12:54 PM     Remind Me!  Send Private Message   Edit Post      
Looks like shishkibob has it:

image link



I know it's a foreign idea for most of us here, but you might want to try taking the car off jackstands.
-mitsuturbo

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gtluke
Fegbasket


Galant VR-4 org Post #: 535183 posted 09/14/07 12:56 PM     Remind Me!  Send Private Message   Edit Post      
he also has a BOV cover, which never existed on USDM gvr4's so he must be OEM anal like me



86gt pte67gtq
galant vr4 1464 12.83 @ 106
05sti, 400whp
00 2.5rs, for sale

Posts: 4210 | From: dirty jersey | Member Since: 09/16/01 | IP: (208.216.127.110) | Report this post to a Moderator

4Grim
I deliver.
1948/2000


Galant VR-4 org Post #: 535189 posted 09/14/07 01:02 PM     Remind Me!  Send Private Message   Edit Post      
Are you guys talking about the green wire with the "boot" plug?

Turbo TB:


N/T TB:(Sorry for the blurry pic)



91 GVR4 1948/2000
96 Galant 5sp DOHC 4G64T
2002 Montero Limited
1998 Montero "Winter Package"



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steve Galant VR4.org Administrator
Key Fob Guy


Galant VR-4 org Post #: 535191 posted 09/14/07 01:06 PM     Remind Me!  Send Private Message   Edit Post      
THIS





I know it's a foreign idea for most of us here, but you might want to try taking the car off jackstands.
-mitsuturbo

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4Grim
I deliver.
1948/2000


Galant VR-4 org Post #: 535205 posted 09/14/07 01:23 PM     Remind Me!  Send Private Message   Edit Post      
Sorry steve...didnt see the enlarged pic. I never had that bracket on mine either. I grounded mine to the firewall..but with the N/T throttle body..it doesn't have that designated spot unlike the turbo TB, so I improvise a new location.



91 GVR4 1948/2000
96 Galant 5sp DOHC 4G64T
2002 Montero Limited
1998 Montero "Winter Package"



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steve Galant VR4.org Administrator
Key Fob Guy


Galant VR-4 org Post #: 535210 posted 09/14/07 01:25 PM     Remind Me!  Send Private Message   Edit Post      
No problem. It made a difference on my car. Apparently it was sometimes grounding and sometimes not.



I know it's a foreign idea for most of us here, but you might want to try taking the car off jackstands.
-mitsuturbo

Posts: 18895 | From: NJ | Member Since: 09/11/03 | IP: (208.215.178.153) | Report this post to a Moderator

gtluke
Fegbasket


Galant VR-4 org Post #: 535214 posted 09/14/07 01:55 PM     Remind Me!  Send Private Message   Edit Post   
the non turbo throttle body doesn't need it, since the TB bolts though the throttle body.
on a stock gvr4, the bolts touch the TB elbow, pass through the throttle body into the intake. if your intake and throttle body gaskets are good, and your bolts aren't bent and centered like they should be, then the throttle body is totally isolated from the elbow, and the intake and it has NO ground because of this, which is the reason for the seemingly useless bracket.
on some cars though, the TB finds a ground though chance one of the bolts touching the TB on the inside, or burrs in the aluminum around the intake/throttle blade area. you might be lucky and its grounded without it, but most likely if you don't have that strap/bracket, you have no ground.



86gt pte67gtq
galant vr4 1464 12.83 @ 106
05sti, 400whp
00 2.5rs, for sale

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