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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
Is your vacuum at idle correct and is your D-WUR vac/boost tube hooked up correctly?

Check your car for proper vac at idle (leaks). If you are not maintaining a proper vacuum level the D-WUR will think you are accelerating.

The D-WUR only knows you are accelerating or from the Vac/boost signal it receives. I takes intake maniflod pressure and the RPM to determine how much to adjust control pressure and thus your AFR. If it is not getting the right signal, it can not work as intended.

I would suspect that at idle you want to be around 14.5-15/1 AFR.

With accel off idle go instantly to about 13-13.2/1 (max pre boost TQ) and then start to become richer as boost starts to build.

Than at cruse go back to about 14.5/1.

It could also be that you are not getting any signal to the MAP circuit at all as if the vac line is not hooked up. In this case it will think you are accelerating at all times but not to the point where it is getting boost and thus run lean on boost.

Lastly, if the D-WUR vac/boost line is hooked up to the wrong place, it could get really wacky as many of the ports off the throttle body are ported and the signal changes at different throttle angle .


Just a thought.
Old 10-22-2009, 10:22 AM
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