280znewbie Posted July 27, 2015 Share Posted July 27, 2015 Hello i have a 76 280 with an l28et swap from an 83 zx. recently the car has had a terrible miss in the high rpms once it is fully warmed up. Also the ecu green led blinks 15-20 times in a 10 second period instead of the 5-10 it should (it used to) the car will run WOT on boost up until about ~3750rpm then it just misses. I did the resistance tests on the air flow meter, chts, and air temperature sensor and they all passed. replaced the o2 this morning and id still runs badly. the car also hates to cold start. u have to crank and crank forever. Quote Link to comment Share on other sites More sharing options...
Tony D Posted July 29, 2015 Share Posted July 29, 2015 The 3750 and WOT (30%+ throttle opening) indicates a point AFTER the O2 sensor and AFM have stopped being trim mechanisms in the fueling of the engine. Quote Link to comment Share on other sites More sharing options...
280znewbie Posted July 29, 2015 Author Share Posted July 29, 2015 Tony D: what u are saying is it is probably insufficient fuel pressure or flow at that point? or possibly ignition? Quote Link to comment Share on other sites More sharing options...
280znewbie Posted August 8, 2015 Author Share Posted August 8, 2015 It is fixed. The alternator positive wire was loose and wasn't charging the battery leading to the ignition cutting. Hooked it back up and installed a new walbro 255 and the car runs perfect. Quote Link to comment Share on other sites More sharing options...
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