Posted by Mike W. on June 19, 2003 at 00:19:34 from 64.12.97.8
In Reply to: Curious problem... posted by Lenny D. on June 18, 2003 at 20:48:53:
Since the tach dives down to zero, it has to be ignition, if it was a fuel cutoff, it would still work, you just wouldn't have any fuel. I would look towards the low side of the ignition since that is where the tach gets it signal. I would think distributor, but I suppose it could be ECU or coil or even tach since they all get a signal from the dist and if there was a short it would likely kill the input to all of them. But remember KISS (keep it simple stupid), it is usually the basic sensors or wiring or the like, not the more complicated stuff that is hard or impossible to test. Check your wiring too, that is about maximum torque and if something has a bad connection that could be where the engine is moving the most and streching the wiring the most and maybe breaking the signal. I had a problem once where the car ran fine at up to half throttle, but over that and it died. Still had tach, but turned out to be a bad wire to the FI temp sensor, and engine torque broke the connection.
Mike