Originally posted by Terry Haines:
Best is to take it right off.Sandblasting has been known to clear it with a hp wash after, most cases a new/later tube cures it....
Not an easy operation to undertake with engine in car. Getting access to bottom nut nearly impossible and if you get it off, then getting it on again is a PITA. You can access from below (I did), but little space to swing wrench. Best tried from above with crowsfoot, removing coil pack to obtain visibility.
I removed mine at 60,000 miles, tube was as clean as a whistle.
If anyone wants to see if venturi is restricted I would suggest a small bottle brush or similar device be inserted from above. Due to bends in EGR-to-manifold tube, venturi not visible even when tube is removed.
p.s. Driver's front wheel on ramp gave sufficient clearance for this work.
