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 MANUALSTOYOTA19904RUNNER 2D UTILITY, 3.0 V, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTS - EFIEMISSION SYSTEMS & SUB-SYSTEMSDASHPOT CONTROL SYSTEM
1990 Toyota 4Runner 2D Utility, 3.0 V, Automatic
Dashpot Control System
1990 Toyota 4Runner 2D Utility, 3.0 V, AutomaticSECTION Dashpot Control System
- Engine must be at normal operating temperature. Check idle speed and adjust, if necessary. Remove cap, filter and separator from dashpot. See Fig 1.
- Start engine. Maintain engine speed at specified testing RPM. See DASHPOT TESTING RPM table. Plug the Vacuum Transmitting Valve (VTV) hole with your finger. See Fig 1.
- Release throttle. Dashpot should be extended and dashpot setting RPM should be as specified. See DASHPOT TESTING RPM table. If idle speed is incorrect, adjust dashpot. See Fig 2.
- To check VTV operation, run engine at dashpot testing RPM for a few seconds. Plug the VTV hole with your finger. Release throttle. Uncover plugged hole. Engine should return to idle in about one second.
- Install dashpot separator, filter and cap. Install filter with coarser surface facing outward.
DASHPOT TESTING RPM
| Model | Testing RPM | (1) Dashpot Setting RPM | ||
|---|---|---|---|---|
| 22R-E | 2500 | 2000 | ||
| 3VZ-E | 2500 | 2000 | ||
|
||||
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.