Post a picture of components that you are speaking of or have questions
about... your Van should not have carburetor, if it is a North American
Air leaks are a common cause of idle issues... they can be easy or
difficult to spot.
A smoke machine can make it easy to find leaks:
Your van should have 2 throttle switches, Idle & WOT (Wide Open Throttle).
Make sure that the Idle Switch is closed when the Throttle is closed. #7 in this link:
Your van is supposed to have an Auxiliary Air Regulator that allows
the engine to Idle high (1200rpm) when the engine is cold... the
valve is located below the # intake runner (where #8 is in the above
When you look inside when it is cold, you should see an opening:
As the valve warms-up, the opening closes... once closed, the engine
should have a normal idle, around 900rpm.
If your throttle screw is turned-in too far, then your warm idle
will not be correct.
Start with checking the idle switch, check for any broken vacuum
hoses, make sure that the Ignition Timing is correct (disconnect & plug
the Idle Control Module between the ignition coil & Ignition module).
Take a fuel sample from the fuel filter (shake the filter and
dump the fuel in a glass jar)... look for rust, water. If either
is present in large quantity, remove the gas tank & check for the
Sunday, October 14th, 2012 AT 6:35 PM