1989 Ford Probe moter sparkplug whire

Sounds like your lifters are going out on that cylinder that the tapping noise is going on, verify if they are getting oil.

Hi there,

the lash adjuster may be blocked with a bit of carbon, try doing an oil change with a good quality engine oil flush, make suer you follow the instructions on the can, this will help remove excess carbon and may fix your problem.

Mark (mhpautos)