I just rebuilt a 90 laser turbo, and it won't start. Everything
looks fine except injectors #2-4 are only getting 1.5v and #1
(closest to tbelt) is getting almost 6v from the injector harness.

If I fire each injector by hand with a 6v battery, then jump in and
crank it, all four cylinders fire once and then it just dies. ;(

Other stuff checked:
-starter runs strong
-compression is 80psi across
-have spark on all, gap .029
-good fuel pressure in rail
-injector harness and plug wires all making good contact
-plug wires are connected to coil pack in correct? sequence-(4123 from left to right)
-plug wires are within 2k ohm of spec
-ecu looks brand new, no cap leakage, plugged in.
-known good battery, charged overnight too
-MPI and all fuses intact and test good

What do I need to replace? It ran before the rebuild, and I was
really gentle on the electronics. Thanks guys

Compression is 80 across all 4? Is that a typo?

shouldn't it be 180? :P
I would try swapping the coil pack with a known good one and see if that fixes it.
I have a spare coil pack that I can get rid of if needed and also have a power tr unit.




-Tony
98'GST
92'TSI-AWD

eclipzgst@charter.net
http://eclipzgst.webhop.net
http://www.newengdsm.org/

turboclipz on AIM

"...don't make me photoshop your pants so high that your undies start going over your head, think of it as a kaptainmyke wedgie if you will" -Kap'n Myke

80 is correct. It's a new engine, the rings haven't been seated yet.

How much for coil pack and transistor unit shipped? Reply to dkgreen@law.pepperdine.edu thanks.

The more I think about it I suspect the ECU, but any suggestions will be tried. Thanks!

Fixed it. The throttle position sensor and resistor pack have identical plugs. They were mixed up. Once I switched them she started right up. :rolleyes

Runs great, very happy to have my first real DSM... bonus that I built it myself from the ground up... we'll see how long THAT lasts hehe.

Oh, and compression is closer to 200 after a 20 mile breakin. I'll measure more exactly after I get a couple hundred miles on the clock.

pics.

Will post more later.

pretty....:thumbsup id post a pic of my 4g63 but it is dirty and ugly.