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91 gvr4 no spark

i have a 91 galant vr4, when i got it they said it needed a ecu, so i got the ecu in it but it still has no spark, im pretty sure the injectors are working, but not 100 percent sure, and we havent been able to use a scan tool on it to see if that would help
 

broxma

Well-known member
Joined
Nov 16, 2009
Messages
911
Location
San Antonio Tx
Signal for spark is relatively linear going from the ECU driver circuit, to the ignitor, from the ignitor to the coil pack. If you have a known good ECU, you really only have two things to check other than the wiring and the spark plug wires themselves. Fortunately, both the ignitor and coil pack are cheap and easy to swap. I would do this first however.

Take the ignitor harness clip and unplug it. Look at the ignitor itself and it has letters on it which correspond to the ground, tach, and spark in and out. Check for ground at the corresponding wire on the harness. Without an oscilloscope, you won't be able to accurately read the signal to the ignitor for the positive, but you should be able to tell if it is there. If so, grab a dummy light and check the wires themselves.

Basically, confirm everything you possibly can, then eliminate things individually. If you find no signal going to the coil pack from the ignitor, but have voltage going in to the ignitor, new ignitor. If you have output voltage to the coil pack and no spark at any plug end, new coil pack.

Subsequently, if you do confirm, and I don't mean just guess, it is either of these things, I have spares here in the garage and can send you them gratis if you pay shipping.

/brox
 

Diego

Well-known member
Joined
Dec 9, 2007
Messages
2,132
Location
In a van down by the river, Iowa
Not quite sure where Urbana is....... but if your close to TylerAdamson, he could help you prolificly
 

mitsuturbo

Well-known member
Joined
Jun 2, 2008
Messages
3,544
Location
Near Seattle, Washington
FIRST thing i'd do, is remove the CAS from the head... Key all the way on (run position) i'd spin the cas and listen for two things... spark, and injector firing. If you're getting injector clicks, and no spark, then yes..... power tr, and coilpack. Otherwise, if no injector OR spark.. replace CAS.

EDIT: Of course, the cas has to be plugged into the harness, and you dont spin the whole thing.. just the part the cam would be spinning if the engine were turning over. Forgive my illegibility. I've been had a couple of drunk a little bit. /ubbthreads/images/graemlins/grin.gif
 
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