detonation at high rpm...

[tp64]

Well my timing is set at 10 degress but its detonating at WOT at like 4grand+... What else could cause that to happen?

 

[kawasakikidd]

are you running 93 octane gas?i will tell you i had det. problems with my 5.0 so i made sure i was set at 10 degree timing. i also had the upper intake cleaned with the daytona machine at marshall mize ford dealer in chattanooga tn. it is hooked up to run thru and bust up the carbon on the tops of your pistons along with cleaning the upper intake.i still had a little det. when i hammered down on it off idle.i also got rid of the cat converters.thinking it might be stopped up a little no codes but thinking back pressure of exhaust was causing the engine to run a little hot on the top end.still would ping a little.so after opening up the exhaust, cleaning the upper intake,tuning it up,making sure im running good 93 octane,it still pinged.so i went ahead and put in the 3.73 gears and after i did the pinging went away when i punched it or when i hammered on it off from an idle.the only thing we could think it was is that the 2.73 stock gearing was way to tall for the small 114000 mile motor.i dont know but i run 14 degree timing now no problems at all. runs killer that has been 2 years ago.i hope this gives you some ideal on what to try. good luck bud

 

[tp64]

wow thanks that helped a bunch. makes sense also seeming that my engine is at 138,xxx right now lol. i was about to order some gears next month anyway. maybe that will fix it.. well see. thanks

 

[kawasakikidd]

well i hope it helps.i was about to pull my hair out on mine.i have a friend at the local autozone he had 2 95 gt 's and sold one to a friend of mine.he said the one he sold had that detonation problem also it was stock but the one he kept never had that problem.i would prolly get the upper intake cleaned also.over time the tops of the pistons gets a lot of carbon build up on them.when you get your gears in there and everything is alright you can start bumping your timing back up a bit i would not go past 15 degrees to stay safe.because pre detonation over time can burn holes in the top of your pistons. but with advance timing mine sure responds a lot quicker i love it. good luck bro hope you get ur done!!

 

[tp64]

yea i hope so thanks bro!