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86 iroc Misfire Diagnostic HELP

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2.8K views 8 replies 7 participants last post by  z284u  
#1 ·
Hey all, having issues with my Camaro and not really sure what to do now, so I'm looking for some suggestions or advice on what to try next. My car is an 86 iroc with a 305 tpi. The car has a pretty bad misfire once it is warmed up, and will cut power (not idle and die) and surge badly under throttle. This only happens once it is good and warmed up. Recently, I have done the following to try to solve the issue(s):
-Plugs/Wires
-Cap/Rotor
-Ignition Control Module
-Fuel Filter
-Temperature Sensor
-Catalytic Converter Delete
-Smog Pump Delete
-Fuel Pressure Regulator Vacuum Lines

The only code the car is showing is for the O2 sensor going in and out of a closed loop fast. This is because of the free flowing exhuast (3 inch pipe, cat delete, flowmaster 40 dual outlet)
If anyone has any ideas i would appreciate it very much! Thanks!
 
#7 ·
I forgot to mention the coil is also new. Accel Super Coil, all other ignition parts are also accel. I changed the O2 sensor and the car is no longer stalling, but still has a misfire. My fuel mileage is pretty bad (11 mpgs or so?) and it starts hard, but I'm not noticing any power loss like bad injectors are supposed to give
 
#8 ·
A miss will cause the o2 to read lean,then dump fuel to compensate causing stalling or rich condition. Defiantly need to figure out the miss.
If you've changed all the ignition components...do these cars have crank/cam sensors or anything like that ?
Maybe a cylinder leak down test to start looking at mechanical issues.