1989 Ford Taurus exhaust manifold

Hi there,

Thank you for the donation,

I would first be checking for a blocked of failed cat converter, start here.

mark (mhpautos)

Hi unlikely, Welcome to 2carpros and TY for the donation

Its getting too much fuel-check injectors and fuel pressure regulator if its leaking-could be running in the open loop mode all the time not switching due to the coolant temperature sensor and oxygen sensor

Also go this link: https://www.2carpros.com/forum/exhaust-manifold-turning-red-vt14824.html