87 GMC Sierra R3500 7.4L TBI vacuum diagram - The 1947 - Present Chevrolet & GMC Truck Message Board Network



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87 GMC Sierra R3500 7.4L TBI vacuum diagram

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10-17-2019, 05:02 AM

Captain J

Registered User

Join Date: Nov 2017

Location: H, Q

Posts: 180

Re: 87 GMC Sierra R3500 7.4L TBI vacuum diagram

Quote:

Originally Posted by DieselSJ

Cap it.

Done, I also connected the AC line as you mentioned (��),
I’ve replaced all vacuum hoses with new silicone hoses, old ones are brittles,
Thanks to you ��

If the truck runs rich, how do I tune the TBI?
This a video that I made on YouTube on how this truck,
https://youtu.be/WHcGnic6_Yo

__________________
1972 GMC Sierra C2500, V8-350
1986 GMC Sierra C2500, V8-454
1986 GMC Sierra C2500, V8-LS1
1986 GMC Sierra K2500, V8-350
1987 GMC Sierra R3500, V8-454
1997 GMC Sierra K2500, V8-454

Last edited by Captain J; 10-17-2019 at 05:03 AM. Reason: Add more texts

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