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Old 09-27-2024, 06:15 PM
mgarblik mgarblik is offline
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Default Need Service bulletin 73-T-21A

I know this bulletin has been asked for numerous times but I could only find 9 pages posted after searching for several hours. I believe this bulletin is 16 pages and I need the entire document to properly put my car back together. I am more than willing to pay for a clean copy either in paper form or e-mailed to me. Please PM if you have this document. Thank you.

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Old 09-27-2024, 07:22 PM
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I don't think I have 73-T-21A, just 73-T-21. See if johnta1 has it. I will double check later tonight.

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Old 09-27-2024, 08:17 PM
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Try this link:


73-T-21A



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Old 09-27-2024, 08:40 PM
mgarblik mgarblik is offline
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Quote:
Originally Posted by johnta1 View Post
Try this link:


73-T-21A


That is just perfect. Extremely helpful. I was hoping one of the 16 pages would call out the vacuum hose stripe colors for the EGR and TCS systems. I have them for a 74 SD-455, but not a 73. Anyone happen to know the callout colors for the hoses. This is not generally something I would care about but this 73 SD I am putting back together, hoping to make it as correct as possible. Thanks again.

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Old 09-28-2024, 09:46 PM
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Quote:
Originally Posted by mgarblik View Post
That is just perfect. Extremely helpful. I was hoping one of the 16 pages would call out the vacuum hose stripe colors for the EGR and TCS systems. I have them for a 74 SD-455, but not a 73. Anyone happen to know the callout colors for the hoses. This is not generally something I would care about but this 73 SD I am putting back together, hoping to make it as correct as possible. Thanks again.
This is from a two part article Pontiac Enthusiast did back in '94.

Yellow-striped full manifold vacuum supply to either the thermal sensor and/or the solenoid.

Red-Striped controlled vacuum signal from the switch and/or solenoid to the distributor advance unit.

White-Striped ported vacuum signal from the carb to the EGR thermal sensor or solenoid.

Black hose with white markings is used from that point to the EGR valve.

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Old 09-29-2024, 03:49 PM
mgarblik mgarblik is offline
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That's what I needed. Much appreciated.

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Old 09-29-2024, 04:33 PM
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No problem. I stumbled on an old diagram I put together you might find helpful. I haven't implemented it myself. Let me know if you concur with the layout.


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Old 09-29-2024, 07:38 PM
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I posted the colors of my late year production '73 350/2 bbl/manual Formula here...
https://forums.maxperformanceinc.com...d.php?t=873846

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Old 10-03-2024, 09:43 PM
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I wish I had better pictures.
1973 SD-455/auto A/C emission hose colors.
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Old 10-03-2024, 11:15 PM
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Here's one I saved to pile on HfR's post. I'll post more if I can find some.


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