[v12-engine] uneven exhaust note during warm up?

I’m still getting some uneven exhaust beat from the B-Bank exhaust
during initial warm-up sequance in the AM…but the symptoms will
disappear after engines warms up to normal operating temp…any
ideas suggestions to look for…?–
Lead
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In reply to a message from Lead sent Thu 1 Feb 2007:

Lead,
My 85 had similar complaints , and I contributed it to the AAV,
which as you can see has its main draw into the rear of the B bank
inlet manifold, then via the balance pipe to the A manifold. And
since it goes away when warmed up, the AAV is closed, so the vacuum
draw is minimal for acceptable hot idle only. Mine was cured when I
removed the AAV and replaced with 2 electric solenoids, switched on
for cold start, and drawing equally to each manifold. Grant–
The original message included these comments:

I’m still getting some uneven exhaust beat from the B-Bank exhaust
during initial warm-up sequance in the AM…but the symptoms will


85 XJSV12 (The Badcat).76S2XJ12 (her cat)87XJ40 3.6
Adelaide South Austarlia, Australia
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In reply to a message from Grant Francis sent Fri 2 Feb 2007:

thanks for the advice grant…ill look into my AAV unit–
Lead
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