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  '74 to '78 -- The Mustang II
  Vacuum lines on a 78 V6 engine

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Author Topic:   Vacuum lines on a 78 V6 engine
yeti
Journeyman

Posts: 2
From: CS, CO 80918
Registered: Feb 2002

posted 10-12-2002 10:38 AM     Click Here to See the Profile for yeti   Click Here to Email yeti     Edit/Delete Message   Reply w/Quote
I'm looking for photos of the vacuum lines for a 1978 V-6 engine. Especially the ones from the PVS (ported vacuum switches) located at the front of the engine and the lines off the air filter housing.
The actual problem with my car is when it reaches normal operating temperature it starts missing will under load. It still idles and revs fine but if I take off and go up a hill it starts missing. Before it gets fully warmed up it runs great. Rebuilt engine, new carb,fuel pump, distributor, ignition module, plugs and plug wires. I exchanged the coil with the one from my 78 Mark V and still the same problem. Any suggestions or photos (I'm wondering if I have some vacuum lines hooked up wrong) would be greatly appreciated.

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Maxwell_fax
Gearhead

Posts: 221
From: Port Royal, PA, USA
Registered: Nov 2000

posted 10-18-2002 06:00 AM     Click Here to See the Profile for Maxwell_fax   Click Here to Email Maxwell_fax     Edit/Delete Message   Reply w/Quote
Looked though some books and none have a vac diagram I could help you with... Dunno if this'll help you much, but I did have about the same problem with mine.. Turned out that there was a thermo vaccum thingy that was stuck.. It was the one to the vac advance.. WHen it's cold it is supposed to advance the timing (route manifold vacuum to the advance) then when it warms up it advances timing as the throttle opens (routes it to ported vacuum). I ultimatly just routed it to ported vacuum all the time and set the base timing ahead a bit to verify that was the problem... Could be that you have some wires crossed and it's working bass ackwards.. Check the vacuum at the distributor when it's cold then when it's warm and see what's going on.. Chances are you can trace it back the line from there..

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