97 accord v6 automatic

After it warms up it starts jumping around.
No engine surges or anything. Runs normal, just jumpy tach

Ideas?

 

This could be a problem with the gauge itself, or the tachometer signal.

The 97 V6 accord gets the tachometer signal from the coil. Id check the electrical connector for the coil first to make sure there is no corrosion and you are getting good contact.

 

High probability it is due to something associated with the ignition coil.

 

If it was the ignition coil, wouldn't it affect the way the car is running?
Someone said something about a blue wire??

Why did I buy a Honda? lol
I love my american cars

 

It's usually due to a faulty resistor in the ignition coil. A faulty resistor doesn't affect the coil’s ignition functions.

There was a July 2001 Honda Service News article on it many years ago:

Tach Fluctuation and/or A/T
DTC P0725: Accord V6
On ’95-
97 Accord V6s, when you troubleshoot a
fluctuating tachometer or A/T DTC P0725 (lockup
clutch does not engage), keep in mind the
cause could be a faulty resistor in the ignition coil.
The transmission control module (TCM) provides
electrical pulses through this resistor to drive the
tachometer.

Although a faulty resistor doesn’t affect the coil’s
ignition functions, you’ll still need to replace the
ignition coil to fix a fluctuating tachometer or A/T
DTC P0725 - the coil resistor isn’t available
separately. Order P/N 30520-P0G-A02, H/C
4598371, for the ignition coil.

 

You have to take into consideration the car is 17 years old.

 

And my american car is 48 years old

Thanks for the info, I'll look into the wires and then look into getting a coil, shame I can't get a resistor

Ah well, with all the help I'm getting on these forums since joining, this thing will be running much better!

Thanks again

 

I still haven't looked into the tach wire yet.. GF drives the car all the time and I get busy.. When I drive it, I find myself watching the tach instead of the road lol

 

I have a 1996 Accord LX, and have also had tachometer issues.

On several occasions, the tachometer has stopped working for a period of time. Each time, I was lucky and the tach started working again.

I've also had "shaky tachometer" issues, which preceded the tachometer not working.

When you get the problem solved, please let us know.

Thanks,

Rob

 

The engine speed output signal for the tach on a 4 cylinder is different than a 6 cylinder.

The engine speed output for a 4 cylinder is from the ignition control module (ICM), which is inside the distributor.