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Old 11-10-2007, 10:36 PM   #1
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Default 94-95 Ignition Wiring

The 94-95 coils have (4) wire interfaces, not (3) as I previously understood. I believe that the 4th wire is for tach output. One of Dan's coil packs took a dump and we were showing only 1/2 of correct engine rpm on the tach. Megatune (MS gets rpm signal from CAS) showed actual rpm. Threw us a loop for a minute, as we were troubleshooting the parallel-MS system, we were at first trying to figure out why MS showed double the rpm.... then we realized that it was the tach that was showing half and MS was accurate.

It must not be until OBDII when the coils go to a (3) wire system and the ecu gives signal to the tach. I'm surprised no one has mentioned this before.
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Old 11-11-2007, 11:09 AM   #2
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isn't that common knowledge? they changed in 95 mid year. 90-95 are 4 wire, 95+ 3 wire. same connector, just missing one lead on the coil and the plug/harness. what's strange is some 95 cars that say OBDI on the hood actually have the 3 pin coils and wiring of the OBDII cars. go figure.
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Old 11-11-2007, 10:54 PM   #3
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thats really ******* retarded...i didnt know this
so here i find myself thitnking cops and call it a day, no?
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Old 11-11-2007, 10:58 PM   #4
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you left the ignition key in it right? gonna have to push it out of the way tomorrow.
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Old 11-11-2007, 11:04 PM   #5
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yeah its in the ignition...im pretty sure
just in case if not, try your key, many are interchangable, as per some guy who got busted stealing miatas up in the north somewhere, lol
but im pretty sure i left it in the ignition
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Old 11-11-2007, 11:42 PM   #6
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i have a 94 coil pack if you guys still need one. i'd have to ship it as i live in NJ
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Old 11-12-2007, 12:05 AM   #7
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Pm
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