Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSFORD1990RANGER 4WD L4-140 2.3L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSVACUUM DELAY VALVES
1990 Ford Ranger 4WD L4-140 2.3L SOHC
Vacuum Delay Valves
1990 Ford Ranger 4WD L4-140 2.3L SOHCSECTION Vacuum Delay Valves
Types Of Vacuum Delay Valves:
Vacuum Delay & Vacuum Retard Delay Valves
NOTE: VDVs are Black on one side and colored on the other. VRDVs are White on one side and colored on the other.
Connect a hand vacuum pump, to one side of the delay valve.
When vacuum is applied to a VDV or a VRDV, vacuum should hold on one side only, then visibly decrease slowly.
Vacuum Delay Valves Vacuum Retard Delay Valves
Black & Color Time (seconds) White & Color
Gold < .35 > Gold
Gray < 1-4 > Gray
Brown < 2-5 > Brown
White < 4-12
4-15 > Pink
Yellow < 5-14 > Yellow
Blue < 7-16
Green < 9-20 > Green
Lt.Green < 13-24
Red < 15-28 > Red
60 > Purple
Two-Way Vacuum Delay Valves
This type of delay valve is one solid color.
Connect a hand vacuum pump, to one side of the delay valve.
When vacuum is applied to the valve, vacuum should hold on both sides before visibly decreasing.
There is no free flow direction in this valve.
Color Time (seconds)
Pink 4-6
Blue 2.75-4.25
Orange 1.5-2.5
Brown 2-5
White 4-12
Yellow 5-14
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.