You may need to use an obstruction wrench? Thats just a wrench with a bend in it. If you can't get at it from underneath, maybe you can get at it from up top, through the intake manifold support bracket opening?
Feb 12, 2013 at 10:54 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.