My dumb *** cousin had put 89 octane fuel. Now my car detonate or misses when I'm at WOT starting at 3000 @3rd gear and when it reaches VTEC crossover it just misses. I can see my A/F monitor lean out when it misses. I took off my fuel filter to see it's clogged, but it's not....WHAT ELSE CAN I DO?

Also my head has been shaved...

 

Dump a bottle of octane boost in there to atleast get rid of the detonation.

 

You need to add the octane booster and DO NOT run the car hard until you can fill the tank with a full load of 91+ gas. The alternative is to try to drain the tank completely and refill it.

 

fuel additives that supposedly boost the octane are bad for your car. I'd drain the fuel out, or add 100 octane race gas (from a pump, not a bottle) to balance it out.

 

REDLINE TOTAL FUEL SYSTEM CLEANER!
and some Sunnocco 94 Octane Gas also!

vnt

 

I've tried BG Engine Composite cleaner and Race Fuel too ( Highest Octane ) What are the chances that 1 of the injectors is clogged up?

 

i dont think your injectors is clogged. Its knocking and pinging b/c there is low octane gas in it. Prelude engines have high compression so it requires a higher octane. Just take it easy on your car till its empty. And just put high octane gas next time you fill up. Its should be fine then.