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Originally Posted by Fordina
So we looked at the two vaccume driven valves (IMRC) on the left end of the engine. The arms are attached as well as other necessary items. One question is, there is very little vaccume on the lines when the car is running. Does this seem to be a problem?
Also I moved the levers a little to see if stuck. The arms seem to touch the resting places where I assume it would be a natural spot when the car is not running. When the car is started the actuators do not move.
heeeeeeeeeeeeeeeeeeellp
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Hi
the IMRC valves are spring loaded extended, which places the butterflies (in the intake manifold) open, where they should only be above about 2900 RPM. When you start the engine, vacuum applied to the valves should pull the arms in and move the internal valves to the closed position. As yours do not move, you are triggering the 1537 stuck open code as they should close with vacuum.
As you are only triggering bank one (rear bank) codes, I would start with the rear actuator. Many of us have had one of these valves fail to hold vacuum and therefore fail to operate. Unplug the rear valve's vacuum line and plug it. Start the van: does the front valve move now? If so, the vacuum loss is in the rear actuator itself. Fairly straightforward at that point: replace the rear valve - rockauto.com is the place for that.
If that test produces no change, then it gets a bit more dicey as you then have vacuum loss somewhere else, and unfortunately there are a lot of somewhere's.
Give that a go and let us know what you find. And, by the way, what year/engine are we talking about here?