Vaccum diagram

I need to find a detailed vaccum diagram for a 1990 bronco with a 5.0 302. please help

There should be a factory-installed diagram on your vehicle. On my 1996 Bronco it is under the hood.

yo G,
Here is the Vehicle Emission Control Information (VECI) Decal; Contains Emission Vacuum Diagram & Calibration Parts List for 88 & UP. On-Line for Free at Ford. Click "Quick Guides" in left panel; Scroll to & CLICK VECI Labels "Provides Vehicle Emission Control Information (VECI) and a related calibration parts list." Enter applicable info (need to know your Calibration number (also called catch code) from your B-pillar sticker). Vacuum Diagram is the same as the one on the core support or hood or air filter cover. Suggest Right Clicking this Hot Link & Open in New Window
Source: by Ford @ http://www.motorcraftservice.com


Vacuum Diagram Color Codes:
Red = Main vacuum
Green = EGR function
Orange = Heat control Valve (exhaust & intake) (AKA heat riser but more complex)
Yellow = Distributor advance
White = EGR vacuum (source)
Black = Mainly used for the Evaporative emissions control
Black = Thermactor ACV or Diverter valve
Blue = Throttle Kicker control
Pink = TAD to Thermactor Air Bypass Valve (TAB or AIR BPV) /AIR Bypass (AIRB) valve
NOTE: AIR BPV is the AIR Bypass (AIRB) Valve; also called the TAB (Thermactor Air Bypass) Valve in other years/diagrams

Air Bypass Valve (AIR BPV) Location pic in a 90 5.8; "...Be advised that the ACV (Air Control Valve) is the TAD (Thermactor Air Diverter) Valve and the AIR BPV is the TAB (Thermactor Air Bypass) Valve. The VRESER is the Vacuum Reservoir Can where the red & black vacuum lines plug into; On my 1990 ex-5.8L, the Yellow Vacuum Line goes from the TAD Solenoid (driver's side forward solenoid) to the TAD (Diverter) Valve located at the rear of the Intake Manifold. You have to climb up onto the engine to feel the Diverter Valve or remove the Intake Manifold. I'd rather climb up using plans, ala a scaffolding type set-up; maybe remove hood depending on circumstances such as me now, w/ backache..."
Source: by Seattle FSB (SeattleFSB) http://www.supermotors.net/registry/media/783571

ACV (Air Control Valve) is the TAD (Thermactor Air Diverter) Valve

MAN VAC is Manifold Vacuum
FPR is Fuel Pressure Regulator
EGR is Exhaust Gas Re-circulation Valve

SOL V:
Thermactor Air Diverter (TAD) Solenoid (SOL V) (AIRD)
&
Thermactor Air Bypass (TAB) Solenoid

EVR is EGR Vacuum Regulator

VRESER is the Vacuum Reservoir Can (Tank);

For Location pics, go to my broncolinks.com site; Emission Section
I would post pics of each component here, but screen jumps around when I try to add URLs

The VRESER is the Vacuum Reservoir Can where the red & black vacuum lines plug into; On my 1990 ex-5.8L, the Yellow Vacuum Line goes from the TAD Solenoid (driver's side forward solenoid) to the TAD (Diverter) Valve located at the rear of the Intake Manifold. You have to climb up onto the engine to feel the Diverter Valve or remove the Intake Manifold. I'd rather climb up using plans, ala a scaffolding type set-up; maybe remove hood depending on circumstances such as me now, w/ backache..
Esky