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Old 10-21-2010, 12:56 PM
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1985 E4ME vacuum ports...

the vacuum tip in switch mounted on firewall up high to pass side of the engine is the vacuum line source supposed to be from ported or from full time vacuum

having a hard time following the emissions label vacuum diagram with all the thousands of hoses and crosses and connections on it

what does this switch do anyways

does it mean tip in as to when you just barely tip open the throttle or?

so that would mean its meant to be run off ported source right?

its the 4.3L VIN N 4bbl oddball truck that 1985 had

ok update, i studied the label some more and think i have most figured out,

looks like port N is for the tip in.

J and H combine to a vacuum motor thing and some Tees to run to the vacuum advance distrib diapragm. should i run it to full time source since this EST system has advance weights for later on timing advance?

and T goes to charcoal canister hmm




Last edited by fast68; 10-21-2010 at 01:16 PM.
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Old 10-21-2010, 01:16 PM
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If it's anything like my 88 305 it would be a vacuum control module for the EGR valve. It keeps the EGR from operating in open loop untill the engine gets to operating temp. and goes into closed loop.
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