How do you adjust the Vanagon idle?
Right when you are getting to the full throttle position you should hear a small “click” noise. Now slowly move the throttle arm back to idle position. Right before you get to this position you should hear the same small click. If you don’t hear it then the switch is out of adjustment.
What causes high idle on carbureted engine?
The main cause for a high idle speed is to mask instability—either a roughness or swing in engine speed. The main culprit for idle instability is uneven fuel distribution in the intake manifold.
Where is the idle control valve on a Vanagon?
Idle Air Control (IAC) valve, also referred to as an “auxiliary air valve” or “idle valve,” located right on top of the intake air plenum, dead center top of engine. We offer a replacement IAC valve here. 4. Idle Control Unit (ICU), also commonly referred to as an “idle computer,” “idle relay,” or “idle control module.”
What kind of fuel management does a Vanagon have?
Vanagons from 1986-91 have a Digifant fuel management system. These systems are pre-“OBD,” which means there is no way to plug in a “scanner” and download “fault codes.” On these vehicles you need to have good, old-fashioned common sense and experience to figure out what is wrong when something is working.
Why is my idle control system not working?
The most common problem we experience with the idle control system is that the TPS is not working, either because it has failed and/or the throttle body is worn out. In either case, the TPS will not close/open when it should, so the idle control system doesn’t get the information it needs.
Where is the throttle position switch on a Vanagon?
1. Idle/Full Throttle Switch on the throttle valve housing, commonly referred to as a “TPS” for “throttle position switch”—located under throttle body. We offer a replacement TPS here . 2. Throttle Valve Housing (aka Throttle Body): This part is almost always worn-out. We offer a re-engineered version here . 3.
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