This started about 5 months ago. Tach would go crazy then the car would jerk. Someone told me that the ignition control module picked up the tach reading so I replaced that. That didn't fix it. So I stuck with the ignition system. I replaced the cap, rotor, plugs and wires with no help. I decided to replace the distributor and when I did the car ran fine for about 20 min. then the tach went crazy then to zero. The car jerked a little but not as bad or as much. It finally threw a code. P0725 (Engine Speed Sensor Circuit Malfunction). Now the whole time the speedometer is working just fine, but I replaced the VSS anyway. Drove it today for about 10 min. with no tach reading, car didn't jerk but I only drove it for the 10 min.

 

I posted a reply on your other post. The coil on the 95-97 V6 accord generates the tach signal. In my 95 shop manual, the P0725 is a transmission code for a bad coil or the wiring.

P0500 is for the speed sensor.

 

P0725 is the ENGINE speed signal. Basically, the transmission computer isn't getting a good tachometer signal. So that matches with your flaky tachometer. And YES, the coil generates the tach signal on 95-97 V-6 cars.

P0500 is the VSS on manual tranny cars. Auto-tranny cars use a different code (P1791) for the VSS since the signal path is different.

 

Well I changed the coil about three weeks ago and so far so good. Thanks for all your help.