AO Silver Member
Join Date: Sep 2004
Location: I would rather not say
Re: Resonance at 2900rpm in all gears.
Two areas to look at.
1) manifold bracket at the first join. Usually rusts, splits and vibrates against each other.
2) under the car, bracket near front of exhaust when loose, sounds like a tin of nails at 2.5k to 2.9k revs
3) manifold heat shield in engine bay usually cracks around mounting bolts and this causes vibration noise. Fix, use oversized washers above and below to "clamp" cracked area.