I"ve searched high and low and haven't found a good definitive list of what can cause such phenomonon.

The car is a stock 93 FD with a 3" exhaust/downpipe/decat.

Only mods are a PWR radiator and a full Vacuum line job with VITON valves.

The car will run fantastic for about 2 days and then it starts falling on its face entering boost, and low and behold the plugs are fouled again in the front rotor.

No coolant loss, no excessive oil loss, no smoke. I have ohm'd out the coils and they were all in spec, not sure if that means they are good or not though hehe...

Replaced the wires with new NGK OEM wires.

Where should i start (other than a compression test, its currently cooling down so I can do this).

 

sounds like you are running rich. get a pfc and a good tune.

Also, since you have a bd/dp/ decat? (I am guessing you mean a gutted stock cat)

How are you controlling boost? Do you have a boost guage to monitor what peak boost you are running?

You could have more going on than you bargained for.

And port your wastegate.




Edit - Yay... 1000th post..... means I need to shut up.