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Originally Posted by c0rnfl4k3
So what was the verdict on the DISA valve?
I'm here in Houston too and have been having a boatload of trouble since it's started warming up... I've got the 1800-2000RPM whistling, misfire codes, crap acceleration and rough idle on my '02 3.0i... I've checked the boot and that looks kosher, so I'm leaning towards the DISA or a MAF that is going out.
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Well I got the new boot on there and repaired the DISA valve but really didn't have a chance to drive it before I discovered fails with a window regulator, front cv boot and valve cover at the same time. I had it in my garage for a week waiting on regulator part. Got the window fixed, now waiting on new half shaft assy and pricing a valve cover/gasket now. I have driven a few times since and same old crap . . . just like what you've got. Misfire codes, rough idle, crap acceleration and still a whistle.
Evidently I've still got a vacuum leak evidenced by the whistle . . . probably around that crappy seal on the DISA valve. Sounds like you've got a vacuum leak too. I wanted to get that fixed first before I started spending more money on hard parts. I was thinking of doing one of those smoke tests because I've been through every other hose on the damn thing and didn't see any problems.