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General 1990 Talon TSi AWD Misfire over 4000 RPM

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flyingfin

Probationary Member
27
0
Jul 20, 2004
New richmond,
Got Talon 1990 AWD. Stroker Engine, EVO III turbo, 650 injector, 255 Walbro pump, 2.5 Exhaust, Stock 1G MAS, ECU+ engine management, Water ALcool. BIg front Intercooler on 2.5 pipe.

When I got over 4000 rpm at WOT the car is misfire i don't think is the fuel cut. I put new spark plug change nothing. If i put throttel at ½ or ¾ sometime the car don't misfire and climb to 7000rpm with anyproblem but each time at WOT the car misfire at 4000 rpm. The logger give me MAS frequency jumping a lot when is comming in the area of 2000 HZ it jump to 1200HZ to 2300HZ it is my problem? i got stock BOV at WOT my boost come over 20 psi but never the MAS read over 2300HZ. Sometime when i use the water alcool system when the boost drop and the water alcool shut the car stall the ECU of the car shut and i have to wait 30 seconds after that the MPI relay make is clic and i can stard the car again. I check and everything is good (ground and 12Volt power) anyone can help?
 
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