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Re: 87 GMC Sierra R3500 7.4L TBI vacuum diagram
Quote:
Originally Posted by DieselSJ
PCV valve is in passenger side valve cover. Driver side valve cover should go to base of air cleaner to provide fresh air for PCV - it is just an open connection with no valve. Unless the previous owner of mine reversed it... Basically one side with PCV should go to vacuum source, and other side is fresh air supply.
Fitting sticking up out of the manifold behind TBI provides vacuum to A/C controls and modulator on automatic transmission.
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Much appreciate it,
On regards to the fitting that supplies vacuum to the A/C controls and modulator on automatic transmission, should it be capped or where does go to?
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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