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Old 01-08-2019, 06:25 PM   #1
Cwazywazy
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Default No spark

'93 B230f with Dave Barton LH2.2 EZK harness installed in an '82 240 diesel. Wired up all the ignition stuff and no spark. Has power to coil with key on. I cleaned connectors to hall and powerstage, tried spare coil, etc. I don't really know if these numbers mean anything, but testing resistance between coil negative and battery negative gets 0ohms with key on. (Cranking makes no change.) About 90 ohms key off.
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Old 01-08-2019, 08:31 PM   #2
dl242gt
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since you have power at the coil which you verified with a test light. Next goto the coil negative with the test light and under cranking see if it flashes. If it does. Then your rproblem is the secondary system like the coil wire distributor cap and wires. If no switching. then I would move to the power stage or ignition amp. Look at the input with a voltmeter and see if it has a fluctuating voltage on the input from the ezk when cranking. I forget which pin, look at the diagram. If it doesn't have the fluctuating input voltage and you verifiied the wiring. Then the icu or hall sensor are suspect. If their wiring is good then another sensor or icu should be tried. You can also verify the resistance of the hall sensor but I don't recall the value. That spec is in the manual. The output of the hall sensor can be checked with a scope. Maybe a meter on d/c volts would read the output too.

No ignition triggering also means no fuel.
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Old 01-09-2019, 09:18 AM   #3
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Are ou sure your ignition components are getting power while cranking? I made this mistake, on my 1980 242 when I did my lh2.2 swap, you have to run everything off the blue wire, as that's the only one with power during both crank and run.
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Old 01-09-2019, 03:19 PM   #4
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Still getting power while cranking.

I took the connector off the hall sensor and with key on none of the 3 pins have positive voltage.

EDIT: Probed the hall sensor wires back to the EZK box and they're all fine. Bad EZK?

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Old 01-09-2019, 04:01 PM   #5
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Old 01-09-2019, 04:44 PM   #6
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Good diag.
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Old 01-09-2019, 07:54 PM   #7
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That is horrible looking solder on the component pins. Good find! I've only had one out and out bad ezk but looking at that solder I'm surprised there aren't more failures.
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Old 01-09-2019, 08:12 PM   #8
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That's a weird way of making a PC Board. Normally, or at least anything in the last 20+ years, PCBs use Plated Through Holes with pads on both sides of the board. This means that there is a circular copper pad on both sides of the board and the hole is plated with copper to connect the two sides. The component wires are then soldered on both sides (or soldered on one side and it wicks through to the other side).

The board you're showing is using non-plated-through-holes and doesn't even have a pad on the non-soldered side - it looks like only one side of the component wires is soldered, and the other side is bare.

Still a good idea to get a bright light and a magnifying glass then painstakingly look at every solder joint, on both sides.
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Old 01-09-2019, 09:07 PM   #9
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Yeah, looks like a fail of the board manufacturing process and/or they were trying to save .00001 of a cent per board so they didn't put the pads on the bottom like you mention. lol.

I got flashbacks from my last job looking at that board. It was my job to repair production fallout and customer rma repairs. It was mostly all surface mount low power vending and smart safe controllers.

It was good while my eyes lasted but now too much of a commute after diabetic retinopathy. Thankfully my eyes are good enough now to do some car stuff again so it's been a much happier place to be.
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