Thread: 87 GMC Sierra R3500 7.4L TBI vacuum diagram
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Old 10-16-2019, 08:08 AM   #11
Captain J
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Question Re: 87 GMC Sierra R3500 7.4L TBI vacuum diagram
Quote:
Originally Posted by Sabaka454 View Post
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Do I cap the J port if the AIR Injection control valve is removed? Or leave it open?
Thanks
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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
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