tjbusk0143

Just bought a 2001 ss Camaro with cat back and slp lid with smooth bellow. It has 100k on it .. I put about 1000 miles on it since i got it it has had a detonation problem since it is now getting warmer out it is getting worse... I went over the entire intake(replaced the intake manifold gaskets). and vacuum system and the fuel pressure is all good..... The car is an R title so i have no idea what could be or was ever done to it. I purchased it from the man who reconstructed it....runs strong I also did plugs and wires returning it to stock plugs... it had the stupid ones with 4 contacts. So with all that done and it still doing it i figured why not try better fuel... i put about 5 gallons of vp race fuel in 3/4 tank 93 octane..........Detonation GONE!...... could the car have an aggressive tune? or is the higher octane just masking a problem by not combusting as soon?......I am stumped.

bobbyd

iTrader: (10)

clean the maf sensor. clean the throttle body. change fuel filter?
knock sensors? any check engine light codes?

tjbusk0143

i cleaned the maf and throttle body also changed the fuel filter. Did not do anything with knock sensors and there is no check engine light on.

tjbusk0143

within the first 500 miles it threw a low cat efficiency code.... 50 miles later it was gone and hasn't come back. I was thinking about buying a predator tuner to put their tune in to see if it stops or atleast check my spark and kr....worth it?

jalchin

Cats are going bad. Same thing I just went through. Light would stay on for a day or so then off for a day or so. Everytime I romped it the light would trigger soon after. Mine didn't looked clogged when I shined a maglight through them but it is hard to tell.