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Does this sound like the kind of vacuum input I am looking for for a typical WUR application ? It is the one that is connected now.
Bill,
Your engine's original WUR had no vacuum enrichment, it was a vent hose, so you are throwing another variable into the mix.
The BOSCH lambda switch usually has the temp stamped on the side of the hex, I checked a few and the terminals came both ways. The switch is grounded when the engine block temp is below this number and opens above it. The idea behind the alternate switch is to delay the onset of closed loop so that then engine gets a bit more enrichment until it is warmer. There is also another ECU , throttle switch and 35C switch on the breather to provide enrichment during cold driving. Have you tested those ? All of these gizmos were to squeak through the emissions test and still have reasonable drivability when cold.
Use the factory WUR pressure/temperature chart in the manual and compare the gauge reading with your IR thermometer.
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Paul
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