only getting spark when i let off the start button.
So I have been dealing with a no start issue on my 08 kfx450. Here's what I know so far. When you turn the key on the fuel pump primes, when I hit the start button it will crank over fine and the fuel injector is pulsing but I'm not getting any spark out of the coil until I let off the start button. when I let off I will get a spark or 2. Here is what I have check so far. All 3 fuses are good and have power with the key on and while cranking. power going to the ecu on pin 13 and 29 is good with key on. ground going to the ecu on pin 21 and 25 is good. ecu is a procom aftermarket ecu. y/r wire to coil has power with key on and cranking. bl/w wire on coil will only pulse when I let off the start button. both coil wires have been checked for shorts to power/ground and correct resistance. crankshaft sensor is sending out about 2.3 vac while cranking and both wires have been check for shorts to power/ground and correct resistance. when grounding the o/bk diag wire to the ecu I do not get an FI light flash but this has been the case since well before it would not start. roll over sensor is sending 3.98 in the correct mounting and .59 when flipped. all wires from ecu to roll over sensor have been check for shorts to power/ground and correct resistance. light blue and br/bk 5v ref wires are good to all sensors. quad also have a kick starter and still has the same problem when kick starting. The stator/crank sensor has been replaced 3 times now. Main ground is clean and tight. battery terminals are clean and tight. Someone please help me out. I'm running out of ideas.
Last edited by Pontiacman63383; 07-11-2018 at 12:22 AM.