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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: markdilljr on July 24, 2010, 08:54:00 pm

Title: open plug ends motor harness
Post by: markdilljr on July 24, 2010, 08:54:00 pm

I have a couple open plug ends on my wiring harness for the motor, can any one help out and tell me what their for. Its a 84 C10 with a 350/TH350, the truck came from factory with a 305 if that helps. I dont have an EGR valve so I am guessing one or two are for that. If they are not need can I clip them off to clean up the wiring harness, thanks

Title: Re: open plug ends motor harness
Post by: VileZambonie on July 25, 2010, 01:04:38 am

ESC distributor, EGR, Vacuum switch, A.I.R. 

Title: Re: open plug ends motor harness
Post by: markdilljr on July 25, 2010, 01:11:50 am

I take the vac switch is the one with the arrow to it, where is it supposed to go to, rite now it is cut and open. Could that be causing my vac. leak I cant find

Title: Re: open plug ends motor harness
Post by: HAULIN IT on July 25, 2010, 09:11:42 am

No, the cut off wire can't cause vacuum to be pulled through it, there shouldn't be any vacuum on that side of the unit. You can test the unit though by using a hand held vacuum pump by putting it on the hose nipple in the picture. Try spraying some carb cleaner around the areas of concern...carb, intake to head surfaces, brake booster & hose, ect. to notice a raise in RPM. Good Luck! Lorne