GSXftw
10+ Year Contributor
- 381
- 78
- Dec 16, 2009
-
Medford,
Oregon
So I have been fighting spark blowout and getting a CDI on my car for months... I have done quite a bit of troubleshooting and talking with their tech support, They're clueless and so am I!
91 GSX, making about 500whp runs great without CDI, but blows spark out as expected at 30+psi.
Now...when the CDI is hooked up, it momentarily fires up on 4 cyl, then it drops to 2, cylinders 1/4 drop injector pulse, and car throws a DTC code 044 ignition circuit failure. The CDI box is brand new, it did this with a used one as well, the harness has been send to dynatek for testing and it tested ok, they sent me back the troubleshooting packet, all the switches/dials are in the correct positions. Rising/crank/restrike/revlimiters set at zero/off. The car has EXCELLENT spark on all 4, the cyl are dropping from losing injector pulse, which has both been verified on a waveform viewer and a noid light.
I have tried replacing (known good units)- the ecu, coil pack, igniter, injectors/plugs, injector resistor (now not using one), tested wire continuity from injector-ecu, have beefed up ecu ground pins. Nothing I do works. Ideas?
91 GSX, making about 500whp runs great without CDI, but blows spark out as expected at 30+psi.
Now...when the CDI is hooked up, it momentarily fires up on 4 cyl, then it drops to 2, cylinders 1/4 drop injector pulse, and car throws a DTC code 044 ignition circuit failure. The CDI box is brand new, it did this with a used one as well, the harness has been send to dynatek for testing and it tested ok, they sent me back the troubleshooting packet, all the switches/dials are in the correct positions. Rising/crank/restrike/revlimiters set at zero/off. The car has EXCELLENT spark on all 4, the cyl are dropping from losing injector pulse, which has both been verified on a waveform viewer and a noid light.
I have tried replacing (known good units)- the ecu, coil pack, igniter, injectors/plugs, injector resistor (now not using one), tested wire continuity from injector-ecu, have beefed up ecu ground pins. Nothing I do works. Ideas?