4Runner Hood Vibration - Toyota Fix
I also had viibration on rear the edge of the hood on my 97 4runner with Toyota bug shield. Adjusting the front stops upward reduces the vibration, but resulted in hood sitting higher than fenders in the front.
My son has a 2004 Tacoma double cab. I noticed the Tacoma cowl cover has a rubber bumper mounted in the middle on front edge of cowl (see picture). No hood vibration on the Tacoma with bug shield.
I tried the Tacoma cowl and it fit perfectly on the 97 4Runner. The Tacoma cowl totally eliminated vibration on the rear edge.
The part number stamped on the 2004 Tacoma cowl is 55708-04030 and 55708-04040. I ordered the 55708-04040 cold weather cowl, installed today. Another option might be to attach a rubber block to 4Runner cowl cover.
2004 Tacoma Cowl Information from Online Catalog:
55781F 5570804040 LOUVER, COWL TOP VENTILATOR. COLD AREA PACKAGE TACOMA $110.84