No spark in 1 & 4 So Confused Please help

[awdspyder98]

I am having a big issue with not getting spark in 2 of my cylinders. Before anyone says I should use the "search button".. I have been the last few days. Heres the issue.. My 2g started running on 2 cylinders the other day as I drove down my street. To make a long story short I went online to look at possible causes.. I went ahead and replaced the the items listed below with either new ones or know working ones:

cam angle sensor
crank angle sensor
transistor
both coils
ecu (swapped in a know working one just to see if both coils would spark, had the injector clips unhooked since I have larger injectors and this ecu was a bone stock one.even if it doesnt work I would think it wouldnt have the exact same issue as mine)

After all the swaps nothing changed. Its still only running on 2 & 3. Today I went ahead and traced all the wires from the ecu to the cam sensor and crank sensor thinking there may be a break in the wire.. but those wires check out good. I also checked for breaks between the transitor and coils.. check good also. Even checked the wires from the transisor to the ecu for breaks and its good! This is so confusing.. what I did notice was WHEN TRYING TO START THE CAR THE COIL THAT DOESNT SPARK IS GETTING A NEGITIVE VOLT READING COMING IN BUT THE OTHER COIL IS GETTING A POSITIVE READING. Not sure if that normal but it doesnt sound normal to me. I even tested the cam sensor and crank sensor by using the steps below

Disconnect CAS connector.
Measure the voltage on harness side pin 3, the red wire, with the key turned to on voltage should be 12 v or more.
Then make sure you have continuity, 0 ohms, on harness side pin 1, the black wire, to ground.
Then measure the voltage on harness side pin 2, the blue and red wire, with key on should be 4.8-5.2V.
Reconnect CAS.
Measure voltage on pin 2, blue and red, while starting the engine it should be 0.4-3.0V.

I am at a total loss as what to do here. I even went as far as to disconnect the front o2 sensor because a thread here stated that his front o2 sensor caused no spark in 2 cylinders. DOES ANYONE HAVE ANY IDEAS

 

[wrencher]

Double check you wiring.
The engine speed test connector is inline with the transistor signal line to 1/4 coil.
Sure the problem is not there? I have ran into issues with those. But some are wired differently.
Find that connector with the blue/red wire. See if there is 2 wires to it.
If there is 2, a bad connection here can cause issues.

Remember ohm testing will only tell you so much. You need to do testing on circuits with a load placed upon them many times to induce a failure.
( if you need some idea's to do circuit load testing I can elaborate)
This is the connector I'm talking about;

 

[awdspyder98]

Double check you wiring.
The engine speed test connector is inline with the transistor signal line to 1/4 coil.
Sure the problem is not there? I have ran into issues with those. But some are wired differently.
Find that connector with the blue/red wire. See if there is 2 wires to it.
If there is 2, a bad connection here can cause issues.

Remember ohm testing will only tell you so much. You need to do testing on circuits with a load placed upon them many times to induce a failure.
( if you need some idea's to do circuit load testing I can elaborate)
This is the connector I'm talking about;

Great.. Ill cneck that connector out this afternoon if it finally stops raining. Could you elaborate alittle more on how to test a circuit with a load? Thanks

 

[lumberjackracing]

Make sure you swapped a 1998 computer into the car. With a 1997 computer you will have to switch a wire pin to a new location for the one coil and altenator.

 

[awdspyder98]

Never heard that before

 

[MY1GDSM]

Never heard that before

That's because it's not true... .

Make sure you swapped a 1998 computer into the car. With a 1997 computer you will have to switch a wire pin to a new location for the one coil and altenator.

Well they have ECMlink and since that they have a 95 ecu an it just requires you to swap the plug wires and Click "use none 95/96 Cas" option

I tune 98/99 ECU that are perfectly plug and play for Any 4G63 powered 97 DSM.

95-96 Have inverted CAS's vs 97+ and require changes for the CAS/Plug wires and Injector wiring/firing order. Depending on what tuning system you're using And exactly what your mix and match of parts from years you're using.