no start after rebuild
 

ok I have been on this forum for months now. I just finally registered because this is an issue I have not found a suitable solution to. the car was givin to me by my good friend of 20 years. its a 91 turbo. the car lost a bearing and was parked 2 years before I started on it. I pulled the motor and got a low mileage long block, tore it down and completely rebuilt it with good stuff, added a header and garrett t04e turbo and hks downpipe, hks evc pro, hks 2mm hg, arp head bolts, arp rod bolts, high performance piston rings, custom made wastegate and matching bov, and greddy turbo timer. power steering, ac, and clutch fan deleted. everything is installed correctly. I used vacuum diagrams from this forum and also the tsrm.

the car will not start. triple checked timing, rewired cas, and checked for fuel pressure. cranks but will not start. also tried resetting the security system by opening all doors, hood, liftgate, and lock/unlocking all doors. no dice. check voltage at coil pack, igniter, and found them good. has new plugs in it as well. have gone threw every check that I could find on this site and others without success. there is also no spark which obviously why it wont start (im guessing). so there is where I need to start. but how?

Well, let's start simple. Does the car turn over at all when you turn the key? Any diagnostic codes stored? Have you checked to ensure the CPS isn't installed 180? off? Have you tested for power that the ECU (Batt, B+ and B1+)?

yes double and triple checked the cps. showing 12v at b1 and no + voltages on bat and b2. the plug is removed from ecu while checking

oh ya and yes, cranks but does not turn over. thanks

anyone else have any clues??

Uh, yeah:

Unless I misread or you mistyped the ECU isn't getting power at two essential inputs.

yes obviously, was hoping for a place toi start on this

Ah, my apologies. As +B and +B1 are both sourced from the Main EFI relay and the Circuit opening relay I would check the harness in between. I am quite surprised that you have power to one and not the other.

Batt gets its power from the 15A EFI relay. If you are getting power to one of the +B lines though this fuse is unlikely to be the cause of the problem and again, you are most likely looking as a wiring problem.

All three should have power whether the harness is plugged in or not, so long as the ignition switch is in the "ON" position. Have you perhaps tested the ignition switch?

Have you inspected your wire harness since reinstalling the engine?

Here is the wiring diagram for the ECU:
http://www.cygnusx1.net/Supra/Librar...px?S=Main&P=46

i did a visual check of the harness before installing. I didnt unwrap the the wire loom tho to check inside. I will check the ignition switch as well as try to get power to the ecu. I am also suprised that only b1 is getting power and not the other two. your right, sounds like a wiring problem. when I hoocked up my multi meter to those other 2 the voltage actually showed a negative of about 1.5v on both. not sure what that means...thanks much cre for your input.

ok, I removed all engine grounds and made new ones. now I'm showing a voltage at b2 and batt but its only between 4v and 5v.... still no start tho