91iroc Posted December 29, 2011 Share Posted December 29, 2011 i have a 73 240z turbo swap. my car was running just fine. i parked it 2 days ago. and went to start it today and it wont start. i am getting fuel but for some reason no spark?? car has a f54 block, p90a head, cas sensor, nothing in the distributor (but rotor) , i just changed the cylinder head temp sensor tonight to see if it helped, but nothing changed. any ideas ? i need help asap Quote Link to comment Share on other sites More sharing options...
FricFrac Posted December 29, 2011 Share Posted December 29, 2011 Are you getting voltage to the coil? Quote Link to comment Share on other sites More sharing options...
s30red240z Posted December 29, 2011 Share Posted December 29, 2011 With a led check the input signal that feeds (+) to the power transistor, has 3 wires heavy ground, input(+), coil (-) Quote Link to comment Share on other sites More sharing options...
91iroc Posted December 29, 2011 Author Share Posted December 29, 2011 Are you getting voltage to the coil? yes i have power to the coil Quote Link to comment Share on other sites More sharing options...
91iroc Posted December 29, 2011 Author Share Posted December 29, 2011 With a led check the input signal that feeds (+) to the power transistor, has 3 wires heavy ground, input(+), coil (-) where do you want me to put the led (transister) ? wheres that? Quote Link to comment Share on other sites More sharing options...
91iroc Posted December 29, 2011 Author Share Posted December 29, 2011 how do i check the cas on the crank? Quote Link to comment Share on other sites More sharing options...
s30red240z Posted December 29, 2011 Share Posted December 29, 2011 (edited) where do you want me to put the led (transister) ? wheres that? This is the power transistor. http://t3.gstatic.com/images?q=tbn:ANd9GcR2qGbPtU0N0oZbCSrMPUQC_nHgHoWeMacncITbHTkqvdjGguiThg Green wire that comes from ECU, is power transistor trigger, led is between ground and green wire, this led has light every ignition event. Try led in the two polarity directions. switch green and ground wires Edited December 29, 2011 by s30red240z Quote Link to comment Share on other sites More sharing options...
91iroc Posted December 30, 2011 Author Share Posted December 30, 2011 This is the power transistor. http://t3.gstatic.com/images?q=tbn:ANd9GcR2qGbPtU0N0oZbCSrMPUQC_nHgHoWeMacncITbHTkqvdjGguiThg Green wire that comes from ECU, is power transistor trigger, led is between ground and green wire, this led has light every ignition event. Try led in the two polarity directions. switch green and ground wires nothing happended while cranking Quote Link to comment Share on other sites More sharing options...
s30red240z Posted December 30, 2011 Share Posted December 30, 2011 (edited) If you have injector pulses, the ECU or harness might be damage. with a tester check continuity to the green wire of power transistor to ECU connector pin 5, of 20 pin connector. In the last led-power transistor test, you had to disconnect the power transistor to did the test, because if power transistor is damage might grounded and bridge three wires: black, blue and green. Edited December 30, 2011 by s30red240z Quote Link to comment Share on other sites More sharing options...
91iroc Posted December 30, 2011 Author Share Posted December 30, 2011 yes the transistor is bad !!!!!! now does anybody have a good one? Quote Link to comment Share on other sites More sharing options...
billseph Posted December 30, 2011 Share Posted December 30, 2011 Hey 91iroc I just had this same problem...after much thinking and research (trust me...a lot of research into cost and availability ) I decided to do the GM HEI upgrade to get spark finally. http://m.zdriver.com/forum/showthread.php?t=27569 There is the link. I had to sign up for zdriver to view the pics which CLEARLY show you exactly what to do and it's working fine so far. For $28 at Autozone I got a unit with a freakin' lifetime warranty so if I burn it up it's FREE to replace...much better than what you'll pay for a new transistor. Other option I looked into was the Z31 turbo coil/ignitor upgrade... http://forums.hybridz.org/index.php/topic/70824-300zx-turbo-coil-on-a-l28et-pictorial-15minutes/page__fromsearch__1 Which if you could find in a junkyard would be a good value as well. But my personal suggestion is do the HEI upgrade. You've got the link right there and it is super easy, affordable, and it's readily available. There's my $0.02. Quote Link to comment Share on other sites More sharing options...
billseph Posted December 30, 2011 Share Posted December 30, 2011 Just wanted to add that I have no long-term testing of this HEI upgrade, and I plan to upgrade to a much less cheesy heatsink. Maybe something that looks more like this... http://www.google.com/m/products/catalog?hl=en&q=heatsink&gs_upl=1141l1549l0l4264l4l4l0l1l1l0l467l467l4-1l1l0&um=1&ie=UTF-8&tbm=shop&cid=9765141805864471637&near=Bakersfield,%20CA&sa=X&ei=lEf-TtitKKX42gWvqvytAg&ved=0CGYQ8wIwBg Just something more like a traditional finned heatsink would make me feel better (and possibly look cooler as well ) Quote Link to comment Share on other sites More sharing options...
91iroc Posted December 30, 2011 Author Share Posted December 30, 2011 Just wanted to add that I have no long-term testing of this HEI upgrade, and I plan to upgrade to a much less cheesy heatsink. Maybe something that looks more like this... http://www.google.com/m/products/catalog?hl=en&q=heatsink&gs_upl=1141l1549l0l4264l4l4l0l1l1l0l467l467l4-1l1l0&um=1&ie=UTF-8&tbm=shop&cid=9765141805864471637&near=Bakersfield,%20CA&sa=X&ei=lEf-TtitKKX42gWvqvytAg&ved=0CGYQ8wIwBg Just something more like a traditional finned heatsink would make me feel better (and possibly look cooler as well ) you got a pic of your setup Quote Link to comment Share on other sites More sharing options...
91iroc Posted December 31, 2011 Author Share Posted December 31, 2011 Hey 91iroc I just had this same problem...after much thinking and research (trust me...a lot of research into cost and availability ) I decided to do the GM HEI upgrade to get spark finally. http://m.zdriver.com/forum/showthread.php?t=27569 There is the link. I had to sign up for zdriver to view the pics which CLEARLY show you exactly what to do and it's working fine so far. For $28 at Autozone I got a unit with a freakin' lifetime warranty so if I burn it up it's FREE to replace...much better than what you'll pay for a new transistor. Other option I looked into was the Z31 turbo coil/ignitor upgrade... http://forums.hybridz.org/index.php/topic/70824-300zx-turbo-coil-on-a-l28et-pictorial-15minutes/page__fromsearch__1 Which if you could find in a junkyard would be a good value as well. But my personal suggestion is do the HEI upgrade. You've got the link right there and it is super easy, affordable, and it's readily available. There's my $0.02. i did do the gm module hookup but it didnt do anything . maybe i hooked it up wrong but i followed the directions to it Quote Link to comment Share on other sites More sharing options...
s30red240z Posted December 31, 2011 Share Posted December 31, 2011 (edited) You can get the 240sx,altima,sentra power transistor a.-is (-) coil, b.- heavy ground, c.-input from ecu Green is coil (-), white input from ecu, black ground. Edited December 31, 2011 by s30red240z Quote Link to comment Share on other sites More sharing options...
91iroc Posted December 31, 2011 Author Share Posted December 31, 2011 i tried to the gm module way but still having issues Quote Link to comment Share on other sites More sharing options...
91iroc Posted December 31, 2011 Author Share Posted December 31, 2011 You can get the 240sx,altima,sentra power transistor a.-is (-) coil, b.- heavy ground, c.-input from ecu Green is coil (-), white input from ecu, black ground. then where does the power wire go? Quote Link to comment Share on other sites More sharing options...
91iroc Posted December 31, 2011 Author Share Posted December 31, 2011 i got new igniter assembly today for original 280zx turbo still same issue Quote Link to comment Share on other sites More sharing options...
s30red240z Posted January 1, 2012 Share Posted January 1, 2012 (edited) The transistor doesn't need power wire. If you have pulses from ecu on green wire, and the new transistor works, the only think that cross my mind, damage coil, not enough current to feed the (+) coil, tach wire might be grounded. Edited January 1, 2012 by s30red240z Quote Link to comment Share on other sites More sharing options...
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