420A Turbo won't start after build

[rstare]

Thanks, TOONAH, for all the help. If I had a timing light or osclliscope handy I would hook it right up and check everything right off for the spark in #1 as it reaches TDC, but I don't.

I'm gonna check my timing again and see if it jumped any teeth. Doing this again to make sure it's right. Line everything back up and reset the ECU and handcrank it to check if my camshafts are doing the right thing. Since it all seems backwards to me how the intake closes and the exhaust open right after. That would make no compression and would throw off the crank sensor from the cam sesnor as well I would presume since they go off each others signal. And spark would occur if the timing was correct, right? If it all was off (like in my case with my camshafts) then nothing would happen, and the engine would just turn over and not start, right? Am I way off, or somewhat on the right track with where I'm going?

It would still send spark, but spark during the wrong stroke is useless. Usually if the timing is only off a tooth or so it would still run. The ecu can somewhat compensate, it won't run good but it should run. Like you said if exhaust cam is opening right after your intake (your sure it's on the same cylinder?) then your compression stroke is turning into the exhaust stroke and it's not going to work.
But, check out the timing

 

[BoostedPhoenix]

Sorry to butt in unannounced but i thought i could provide a clear description of a problem that troubled me for months in my '97. This was a problem that started as a random missfire that would come on completely by suprise, then went away for about 2 months, . After hours of scratching my head and throwing parts at it, i found out the coil pack had tiny cracks in the casing that may or may not have lead to the destruction of the transistor for coil B (cyl 2 & 3) in the ECU. In my case i had power to the coil when i should have but Pin 3 in the connector was constantly shorted to ground... This caused the power readings to be normal when the plug was disconnected but drug the power down when the coil was plugged in. Thus i would get no spark at all while cranking even though pin 1 was pulsing. Bottom line, check for 12 volts when the coil is unplugged, if all is well, check continuity between pin 1 and then 3 to ground while you crank. Make sure they pulse with the engine cranking and not constant ground, Coils dont work when that happens .

 

[PCD_RS]

It would still send spark, but spark during the wrong stroke is useless. Usually if the timing is only off a tooth or so it would still run. The ecu can somewhat compensate, it won't run good but it should run. Like you said if exhaust cam is opening right after your intake (your sure it's on the same cylinder?) then your compression stroke is turning into the exhaust stroke and it's not going to work.
But, check out the timing

Ok, thanks, Ryan, for the info. I am sure it's on the same cylinder. I checked it like 10 times or more to make sure my mind wasn't playing tricks on me. Hard to find time to work on her with finals running a muck in my life right now.

i found out the coil pack had tiny cracks in the casing that may or may not have lead to the destruction of the transistor for coil B (cyl 2 & 3) in the ECU. In my case i had power to the coil when i should have but Pin 3 in the connector was constantly shorted to ground... This caused the power readings to be normal when the plug was disconnected but drug the power down when the coil was plugged in. Thus i would get no spark at all while cranking even though pin 1 was pulsing. Bottom line, check for 12 volts when the coil is unplugged, if all is well, check continuity between pin 1 and then 3 to ground while you crank. Make sure they pulse with the engine cranking and not constant ground, Coils dont work when that happens.

Thanks, Boosted, for another scenario it could be, but my coils are brand new. I have a brand spankin' new OEM coil and an MSD coil too as a back up just in case anything were to happen to the other coil I happen to be using. Finals are ruining my time with my car so once all this school stuff is out of the way I'll have well over a month with just me and my car We'll be getting to know each other a whole lot more in the next month

 

[Flipboi89]

Still not running?

 

[PCD_RS]

Haven't had a lot of time to work on her. But today I think I'll have some time. Gettin' layered up for the cold then seein' what I can do today. I'll edit this poast later and give an update on the status.

Update:
So my bro and I did tests and its gettin signal fine to the coil connector. But the left and right on the connector were not showing any sort of voltage. So my last idea is somethin in my ECU is gone