The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1988 - 1998 GMT400 Chevy & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 12-03-2021, 07:04 PM   #1
corysam
Registered User
 
Join Date: Jul 2011
Location: Arkansas USA
Posts: 7
TBI rebuild

Im kitting the throttle body on my 1991 C1500. Its a Silverado with a 350 & automatic. In the kit there are two tiny pieces that I cant figure out where they go. They're really small and feel like rubber. They look kind of like little screens. I attached a photo. I havent been able to find anything on them online. Except they are in photos of the kits.

Does anybody know what they are or where they go?

thanks
Attached Images
 
corysam is offline   Reply With Quote
Old 12-03-2021, 07:14 PM   #2
hatzie
Moderator
 
hatzie's Avatar
 
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,649
Re: TBI rebuild

Originally GM put screens on the fuel injectors. I believe that's what those are.
Download the Driveability and service manuals from the 88-98 manuals page. Likely there's info on stripping down the injectors.

I'd download the parts books as well. They're only 88-93. 94-2000 are on Microfiche only.

I've never stripped one down and rebuilt one of these TBI throttle bodies. They can't be any worse than a Rochester Quadrajet. Hopefully someone that's done one of these units will chime in.
__________________
1959 M35A2 LDT465-1D SOLD
1967 Dodge W200 B383, NP420/NP201 SOLD
1969 Dodge Polara 500 B383, A833 SOLD
1972 Ford F250 FE390, NP435/NP205 SOLD
1976 Chevy K20, 6.5L, NV4500/NP208 SOLD
1986 M1008 CUCV SOLD
2000 GMC C2500, TD6.5L, NV4500
2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263
2009 Impala SS LS4 V8


RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...Please include at least the year and model in your threads. It'll be easier to answer your questions.
And please let us know if and how your repairs were successful.
hatzie is offline   Reply With Quote
Old 12-03-2021, 09:42 PM   #3
Boog
laying low
 
Boog's Avatar
 
Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 11,484
Re: TBI rebuild

Many years ago I rebuilt the throttle body on my 88 gmc. Nothing to it. I do remember there were screens in the injectors but I do not remember those items you pictured. What brand rebuild kit did you buy?
Last week I rebuilt the throttle body on my 91 chevy. There were no screens in that Standard brand kit and the injectors are staked so I couldn't open them up anyway. There was nothing to replace in the injectors so no need to open them.
A TBI is super easy to work on with very few parts to it.
Yes, easier than a Qjet.
__________________
Boog
69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver
primer is finer
91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said.

I stand for the flag and kneel at the cross
Boog is offline   Reply With Quote
Old 12-04-2021, 10:28 AM   #4
corysam
Registered User
 
Join Date: Jul 2011
Location: Arkansas USA
Posts: 7
Re: TBI rebuild

Thanks for the help. The manuals helped. In the one titled X9136_1991_GMC_Light_Duty_Truck_Fuel_and_Emissions_Including_Driveability I found a reference to the fuel injector inlet filter so I searched around some and found out thats what these are. The are located in the side of the injector. I haunt even noticed them before. I appreciate the help.

By the way, kitting this throttle body is much easier that a quadrajet. Fewer parts and none of the adjustments like a quadrajet. You just clean it and put it back together. I added a pic of the hole where the filter goes.
Attached Images
 

Last edited by corysam; 12-04-2021 at 05:47 PM.
corysam is offline   Reply With Quote
Old 12-04-2021, 11:06 PM   #5
Just call me Sean
Registered User
 
Just call me Sean's Avatar
 
Join Date: Jun 2014
Location: Orlando Florida
Posts: 1,157
Re: TBI rebuild

Cool. Thanks for the pic. I "rebuilt" a few but it has been a long time so I don't remember those.
__________________
Quote:
Originally Posted by Early Cuyler
Fights begin, fingerprints are took, days is lost, bail is made, court dates are ignored, cycle is repeated.
Just call me Sean is offline   Reply With Quote
Old 12-05-2021, 12:08 PM   #6
hatzie
Moderator
 
hatzie's Avatar
 
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,649
Re: TBI rebuild

Quote:
Originally Posted by corysam View Post
Thanks for the help. The manuals helped. In the one titled X9136_1991_GMC_Light_Duty_Truck_Fuel_and_Emissions_Including_Driveability I found a reference to the fuel injector inlet filter so I searched around some and found out thats what these are. The are located in the side of the injector. I haunt even noticed them before. I appreciate the help.

By the way, kitting this throttle body is much easier that a quadrajet. Fewer parts and none of the adjustments like a quadrajet. You just clean it and put it back together. I added a pic of the hole where the filter goes.
No problem

I kinda figured they would be pretty simple. I've just never needed to mess with one.
No fuel sitting in the main body of the unit to gum up the works like a Possible loose bushings on the throttle plates are likely the hardest issue to deal with.
__________________
1959 M35A2 LDT465-1D SOLD
1967 Dodge W200 B383, NP420/NP201 SOLD
1969 Dodge Polara 500 B383, A833 SOLD
1972 Ford F250 FE390, NP435/NP205 SOLD
1976 Chevy K20, 6.5L, NV4500/NP208 SOLD
1986 M1008 CUCV SOLD
2000 GMC C2500, TD6.5L, NV4500
2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263
2009 Impala SS LS4 V8


RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...Please include at least the year and model in your threads. It'll be easier to answer your questions.
And please let us know if and how your repairs were successful.
hatzie is offline   Reply With Quote
Reply

Bookmarks

Tags
efi tbi

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 08:45 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2022, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com