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Old 08-06-2013, 07:36 PM   #1
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Default No spark while running, but spark when initializing MS1

1991 1.6L
MS1 HiRes
Standard LED-> ignition mods

Just finished a COP conversion with 1zz coils.

I finished my COP conversion, car ran fine upon an initial test. Then, when buttoning everything up I think I shorted the 1&4 control wire to +12V for more than a few seconds. Now the car will only run on cylinders 2&3.

I have verified only 2&3 are running by disconnecting the coils while the car is running.

I have swapped coils around to show that none of them are dead.

I get visible spark on 1 and 4 when the ECU is turned on, but none when it is running. I pulled a coil and put a spare plug in it, I see spark when the ecu turns on, but none when it's running, with no configuration changes.

I poked around in my MS1 with a multi-meter to check out the transistors, but couldn't find anything wrong. Not that I am an expert in checking such things...

I took out the plugs, cleaned them (though they looked decent), and put them back in.


I am totally at a loss for what to do or what could be causing this... any thoughts?
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Old 08-06-2013, 09:29 PM   #2
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Replaced CAS with presumed good one, no change.
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Old 08-07-2013, 11:27 AM   #3
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Please post a copy of your MSQ.
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Old 08-07-2013, 11:30 AM   #4
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Will do as soon as I get home. Or I may run home for lunch just to grab a copy...
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Old 08-07-2013, 06:37 PM   #5
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Here is my MSQ and pictures of my MS board. I see that I have 1k pull-up resistors for the ignition drivers, I will try replacing them with 100-ohm resistors right now.





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No spark while running, but spark when initializing MS1-sshx3td.jpg   No spark while running, but spark when initializing MS1-rcvnoms.jpg   No spark while running, but spark when initializing MS1-vaow1vf.jpg  
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File Type: msq CurrentTune.msq (40.1 KB, 39 views)
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Old 08-07-2013, 07:18 PM   #6
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The inboard-most LED lights up nice and strong, the outboard-most LED lights up VERY faintly.

Does this mean a shot transistor? I'm going to try and source a replacement...
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Old 08-07-2013, 08:18 PM   #7
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Replaced pull-up resistors with 100ohm, no improvement. Got some transistors to try now...
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Old 08-07-2013, 09:14 PM   #8
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I did have the LED ignition mod.

Upgraded my two pull-up resistors from 1koh to 100ohm and replaced the spark control transistor on the pair that wasn't working, it's LED was lit up VERY dimly. Now my car runs great!

The 1&4 control transistor had partly failed, still allowing spark during initialization but wasn't strong enough to power the COPs (or it's LED) when running. I've never seen anything like it before.

Last edited by jch13; 08-08-2013 at 09:55 AM. Reason: For completeness
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