vacuum help please
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vacuum help please
Hello, newbie here. I am working on a 25 passenger van for my church. It's a short bus I guess & it is a 1987 with a 7.5 liter engine. I have done some searches on this forum, but can not seem to find exactly what I need. A previous mechanic removed the air pump & re-routed all the vacuum lines on it. It runs really rich & you can smell gas while driving on the highway with it. I see uinder the hood there is a vacuum diagram, but I do not understand the various abbreviations & need help with them please. I also need to know if there is an alternate version of vacuum routing after the air pump is gone. I know what is there has to be wrong since the vacuum block on the thermostat housing has nothing on it at all & that is only for starters. I hope I posted here in the correct forum. My local dealership has no info on this engine because of it's age. Please help!
Fleet Owner
Joined: Aug 2005
Posts: 23,666
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From: Easton,Ks
Take photo of the vacuum diagram and email it to me and I may try to help you. My email address is below in this post.
I take it that this is a carb 460.
Here is a few of the abbreviations:
AIR BPV = AIR ByPass Valve
CPRV = Canister PuRge Valve
CARBON CAN = CARBON CANister
EVR = Egr solenoid Vacuum Regulator valve assembly
EGR = Exhaust Gas Recirculation valve
SOL V = SOLenoid vacuum Valve assembly
MAP = Manifold Absolute Pressure sensor
VRESER = Vacuum RESERvoir
MAN VAC = MANifold VACuum
DIV = air DIverter Valve
FPR = Fuel Pressure Regulator
PCV = Positive Crankcase ventilation Valve
TAB = Thermactor Air Bypass vacuum solenoid valve
TAD = Thermactor Air Diverter vacuum solenoid valve
TCP = Throttle temp ComPensating valve
IAS = Intake Air Solenoid
ACV = combination air Bypass/Air Control Valve
CPRV = Canister Purge Regulator Valve
SV-CBV = Solenoid Valve-CarBuretor bowl Vent
TVV = carburetor fuel bowl Thermal Vent Valve
PV = Power Valve
BV = Bowl Vent port
MAN VAC = MAiN VACuum source,
A/CL DV = Air ControL DiVerter valve (Carb heat valve)
VVA = Venturi Vacuum Amplifer
VDV = Vacuum Differential Valve
VCV = Vacuum Control Valve
VCK-V = Vacuum Check Valve
CARB = Carburetor
DIST = Distributor
TK = Throttle Kicker
I take it that this is a carb 460.
Here is a few of the abbreviations:
AIR BPV = AIR ByPass Valve
CPRV = Canister PuRge Valve
CARBON CAN = CARBON CANister
EVR = Egr solenoid Vacuum Regulator valve assembly
EGR = Exhaust Gas Recirculation valve
SOL V = SOLenoid vacuum Valve assembly
MAP = Manifold Absolute Pressure sensor
VRESER = Vacuum RESERvoir
MAN VAC = MANifold VACuum
DIV = air DIverter Valve
FPR = Fuel Pressure Regulator
PCV = Positive Crankcase ventilation Valve
TAB = Thermactor Air Bypass vacuum solenoid valve
TAD = Thermactor Air Diverter vacuum solenoid valve
TCP = Throttle temp ComPensating valve
IAS = Intake Air Solenoid
ACV = combination air Bypass/Air Control Valve
CPRV = Canister Purge Regulator Valve
SV-CBV = Solenoid Valve-CarBuretor bowl Vent
TVV = carburetor fuel bowl Thermal Vent Valve
PV = Power Valve
BV = Bowl Vent port
MAN VAC = MAiN VACuum source,
A/CL DV = Air ControL DiVerter valve (Carb heat valve)
VVA = Venturi Vacuum Amplifer
VDV = Vacuum Differential Valve
VCV = Vacuum Control Valve
VCK-V = Vacuum Check Valve
CARB = Carburetor
DIST = Distributor
TK = Throttle Kicker
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