Question

How can I fix this? OBD2 code P1518 on 1999 Ford F150 4.9L V6 truck with the V6? The engine light is on, and the car backfires

Answer 1

P1518 Intake manifold runner control malfunction stuck open

The fix is to replace the IMRC. To do this you remove the upper intake manifold. to move out the way there in the back is the IMRC, on the lower intake manifold

Answer 2

P1518 Ford Code - Intake Manifold Runner Control Stuck Open
Read more: https://www.autocodes.com/p1518_ford.html