420a fresh rebuild no spark.

[Shameless]

i've read alot of posts with my same issue. The last engine had no oil pressure so i built a new engine to put in. the car ran before i parked it. When i try to start the fuel pump primes, the engine cranks but no spark. did a spark test on the wires, no spark. I've checked all of my connections and grounds and everything is fine. I've replaced the coil pack, cam position sensor, and crank position sensor, still nothing. I also swap the asd relay and still nothing. I have no clue as to what my next step should be. please help

i've done as many voltage tests as i can and still no luck, my mind is wandering towards a bad ecu. the wires to the coil pack have power but isnt getting that boost from the ecu when its time to start.

 

[born2tune]

First, check for 12V at the positive terminal of the coil while cranking. You should have 12V.



Next, take a voltmeter set to VDC. Remove all leads from the positive terminal of the coil. Jumper 12 V directly to the red or orange lead removed from the coil. Place the red probe of your volt meter to the negative terminal of the coil, and the black probe to ground. Slowly turn the engine over by hand, in the rotor through-bolt located all the way to the right end of the set in the center. As the ignition module opens and closes, the meter should read 12V for 1/2 revolution, and drop to about 1V for the other 1/2 revolution.

then let me know what results you get from these tests...

 

[DSM315]

my buddy had the exact same problem . and it was the speed sensor . un plug and try it .