jerryb Posted April 27, 2007 Share Posted April 27, 2007 Well the engine starts on a heart beat ..every time.... but runs very rich. Whats odd is that it runs nearly the same way on all my ECUs....chipped or stock! The only ECU it doesnt run on is the FC. It even runs the same if I change back to the stock MAF...(vs Z32)... I found that my MAF voltage reading is much less than half of what it should be. The FC commander doesnt even show a voltage reading and Apexi tells me that the FC is more sensitive and wont run on low MAF voltage...or any lower than normal signal voltage..... and its a common problem...especialy with RX7s. Apexi sugests it may be a ground...which I will track tonight. Any other possibile causes I should consider?? Amazing...the stock ECU will run on a milivolts reading ( mind you not well) but the FC wont even recognize a signal. Speaks volumes for OEM! Quote Link to comment Share on other sites More sharing options...
240Z_Master Posted April 29, 2007 Share Posted April 29, 2007 Check the wiring to the MAF... Quote Link to comment Share on other sites More sharing options...
mjfawke Posted April 30, 2007 Share Posted April 30, 2007 Did you check your base fuel pressure? The factory computer will try and run closed loop @ idle, so it's more likely to be a fuel system issue. Quote Link to comment Share on other sites More sharing options...
jerryb Posted May 3, 2007 Author Share Posted May 3, 2007 IT WAS A GROUND!!! MAF was wired ok. I spliced an extra ground off the MAF and attached it to engine...bingo. the FC started up right away. Once I changed the injector and MAF settings the car went into a smooth smoke free idle! Its istill rich and needs a tune but its a 1000% better. Now I gota find out why the FC is not keeping the changes in memory. It sets back to default when I shut the car off... BTW I found this site that appears to be a great FC / Skyline / electronics resource... http://paulr33.skylinesaustralia.com/ Quote Link to comment Share on other sites More sharing options...
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