What Vacuum Lines Do I Actually need
Post Fiend
Joined: Mar 2011
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From: Lynchburg, VA
Last Tuesday morning was 2* here. First thing I did that morning was test drive a Buick LeSabre to diagnose poor heat output (read: COLD). Made me glad we don't usually get those temperatures.
Posting Guru
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From: Burlington, WI
Yeah this winter is kicking everyone's ***. Hold on to your hats folks, because now we're supposed to get another 3-5 inches of snow, then warm up to 35* to just start melting it, then drop down to 3* by early to mid next week to deep freeze us all again.
Hotshot
Joined: Feb 2004
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From: The Shenandoah Valley
An old trick for mileage, one that I've used and found does help some is running manifold vacuum on the distributor, but you'll have to unhook it to set total mechanical timing, then hook it up and drop rpms by closing the carb some more.
However, currently I have my distributor on ported vacuum, this Edelbrock carb picks it up real soon off idle.
Also use vacuum for PCV valve, power brake booster, heat & AC control vacuum supply (operates blend doors and heater valve), transmission modulator valve, and cruise control actuator.
That's all I use on my '77 now.
However, currently I have my distributor on ported vacuum, this Edelbrock carb picks it up real soon off idle.
Also use vacuum for PCV valve, power brake booster, heat & AC control vacuum supply (operates blend doors and heater valve), transmission modulator valve, and cruise control actuator.
That's all I use on my '77 now.
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New User
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An old trick for mileage, one that I've used and found does help some is running manifold vacuum on the distributor, but you'll have to unhook it to set total mechanical timing, then hook it up and drop rpms by closing the carb some more.
However, currently I have my distributor on ported vacuum, this Edelbrock carb picks it up real soon off idle.
Also use vacuum for PCV valve, power brake booster, heat & AC control vacuum supply (operates blend doors and heater valve), transmission modulator valve, and cruise control actuator.
That's all I use on my '77 now.
However, currently I have my distributor on ported vacuum, this Edelbrock carb picks it up real soon off idle.
Also use vacuum for PCV valve, power brake booster, heat & AC control vacuum supply (operates blend doors and heater valve), transmission modulator valve, and cruise control actuator.
That's all I use on my '77 now.
And I am alittle green but what is the PCV? Just wondering if that is something I should have hooked up?
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Dave I for now I am going to leave the EGR out.....so I will set it at 12 untill I decide to hook it up........seems to be a matter of opinion weather it needs to be or not.....Its prob safer for the motor to use EGR huh, does it effect gas millage?
Post Fiend
Joined: Mar 2011
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From: Lynchburg, VA
So if you hook the distributor up to manifold vacuum you are advancing the timing all time......suppose it would be the same as just advance your overall timing and leaving the distributor vacuum on the ported vacuume?
And I am alittle green but what is the PCV? Just wondering if that is something I should have hooked up?
And I am alittle green but what is the PCV? Just wondering if that is something I should have hooked up?
PCV is positive crankcase ventilation. A manifold vacuum line runs from the carb to one valve cover. The other valve cover has an intake tube that runs to the air cleaner. The pistons moving, along with normal blow-by would normally create quite a bit of pressure inside the crankcase, which is a BAD thing. The PCV system runs the blow-by back into the intake to be burned.
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[quote=devino246;13963566]Vacuum will still change with throttle angle, so it still serves the same function off idle.
PCV is positive crankcase ventilation. A manifold vacuum line runs from the carb to one valve cover. The other valve cover has an intake tube that runs to the air cleaner. The pistons moving, along with normal blow-by would normally create quite a bit of pressure inside the crankcase, which is a BAD thing. The PCV system runs the blow-by back into the intake to be burned.
Hey thanks for the info! I know there is a line that goes to the top of the oil cap but not sure about if the one to the air cleane is hooked up I will check this out tomorrow.
PCV is positive crankcase ventilation. A manifold vacuum line runs from the carb to one valve cover. The other valve cover has an intake tube that runs to the air cleaner. The pistons moving, along with normal blow-by would normally create quite a bit of pressure inside the crankcase, which is a BAD thing. The PCV system runs the blow-by back into the intake to be burned.
Hey thanks for the info! I know there is a line that goes to the top of the oil cap but not sure about if the one to the air cleane is hooked up I will check this out tomorrow.
Posting Guru
Joined: Nov 2011
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From: Burlington, WI
From what I've been taught, no the egr does not affect gas mileage.
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