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Re: 87 GMC Sierra R3500 7.4L TBI vacuum diagram
Quote:
Originally Posted by Captain J
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 |
"Tune" a TBI is done with a programmer and a chip. Rich is typically because of bad (leaking) injectors or bad fuel pressure regulator. Take off air cleaner and run the engine and point a timing light at the bottom of the injectors. You should see a nice even cone shaped spray with no drips.
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87 R30 CC Dually, TBI 454, NV4500, zero rust barn find
87 Jeep Grand Wagoneer, 6.5 turbodiesel, 700R4
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