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Could very well be detonation. It sounds like a bunch of bearings or BB's being shaken in a metal can or something. My first suspect is the fuel cut defensor. If its bad, it can cause the fuel injector duty cycly to be too low under boost, and lean out too much, causeing detonation.. If you have access to a voltmeter, do this. Turn the car on to the run positon, but not running. Get the voltmeter and measure the map sensor voltage accross it. It should be around 4.5 volts, give or take .1 or .2 volts, NO MORE. When my FCD went bad, i was running to lean at 8 psi, with over 120 psi of fuel pressure! If you get a voltage lower than 4.5 volts, disconnect the FCD from the map sensor, and remeasure the voltage. IF it goes back up to 4.5 volts, then thats your problem. Also, be SURE to check your fuel pressure under boost, to be sure thats where its supposed to be. EGT's and A/F numbers?? At 5 psi, stock injectors, you need around 80 psi of fuel pressure. Try those things out and see what you get..
 13.5 @108 MPH-2.2 60ft(stupid FWD!) S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential fuel injection) My webpage: http://eclipsed4evr.home.comcast.net -1998 Mitsubishi Eclipse RS-T- "Toy" -1992 Plymouth Laser Turbo AWD(SOLD) -2000 Honda CR-V(daily)
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