On a '94 the tach signal comes from the coil packs (with built-in ignitors).
A twitchy tach is often caused by an ignitor on it's way south but in this
case if there's a wiring problem between the ECU and the coil packs then an
ignitor can potentially be left on way too long ... and that could draw
enough current to blow the fuse.
----- Original Message -----
From: "derf" <[email protected]>
To: "Bill Cardell" <[email protected]>
Cc: "Ray Ayala" <[email protected]>; "Miata Power List"
<[email protected]>
Sent: Tuesday, June 07, 2011 11:13 AM
Subject: Re: 94 Dies, What's up?
I did that, wiggle, disconnect, reroute, reconnect. The tach twitch
seems to lessen as it warms up.
Any idea where the black wire from the coil goes to ground? Could the
loss of coil ground caused my engine fuse to blow?
This Japanese car is seeming more British all the time.
On Tue, Jun 7, 2011 at 1:09 PM, Bill Cardell <[email protected]> wrote:
Do a wiggle test on the wires going from the body to the CAS, coil, etc.
This harness gets flexed every time you shift or get on/off the
throttle. Wiggle things while the car is idling, if the tacho jumps
around or car dies, slice that harness open and start looking.
Bill Cardell
TurboDog's Dad
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