Once again the old '99 has me angry..
The 99 is pinging/ detonating..... again. The last time I had this happen I replaced the plugs and it went away. Not this time.
It is NOT supercharged nor does it have NOS. its all stock and no check engine lights.
It doesnt matter if its 87 or 92 octane.
The car has 4,000mi on rebuild.
All coils have been replaced
5,000 mi on spark plugs, They all look good (nice tan color) NO carbon at all
had the computer reprogramed at ford
new fuel filter
All new o2 sensors
clean air filter
the fuel pressure is normal
Its pings/detonates worst in 5th gear at half throttle or more. It never has a loss of power while pinging.
There are no vaccuum leaks (checked all of them)
I never replaced the cam sensor or crank sensor, would that make it ping? Any help is appreciated.