I posted this in the EG forum also
I had this problem a few months ago and never figured it out, it just went away. Well, now it’s back. I have a factory gauge cluster with tach. What’s happening is my tachometer is lagging behind my engines actual RPM’s. The best way I can describe it is it seems like the needle has extra weight on it or is in a bind. Before, when I was going 70 mph, I would be reading about 3200-3500 RPM’s. Now, it’s about 2100. If I go WOT, it will finally jump and read almost all the way to redline, however, it hit the rev limiter at 7500 instead of around 8000-8200. I don’t know how to check the gauge itself or unit that sends the signal.
Where is the sending unit for the tach? Will this affect when vtec engages?
Any idea’s are welcome. Thanks

 

Anybody know how I can check this with an ohm meter?

 

Here's how to fix the problem on a G2 Teg, should be the same for you.

http://www.g2ic.com/tegtips/engine/10.html

 

Thanks for the link, I'll try that this afternoon.

 

That brings up another question. Does this send a signal to the ECU? If so, then it would seem like it would affect the vtec crossover point. Like engage vtec at the wrong RPM.

edited spelling


[Modified by fred97gle, 4:27 PM 11/12/2002]

 

It didn't work. Actually the link is for a tach that is bouncing. Mine is acting more like it's on novacain.


[Modified by fred97gle, 8:18 AM 11/13/2002]

 

My tach was giving me the bouncing problem, with a simultaneous engine skip. Now the engine runs fine, but the tach has quit working altogether. What can I do to fix this?

 

This thing has been wracking my brain. Well, I took out the gauge cluster today and took the tach out also. I put some machine oil on the shaft holding the needle, put it all back together and it works now... Perfect. I don't know if it was from taking the connections apart and putting them back together that did it or the oil. Either way I'm glad.

 

I'm gonna take my guage cluster out tonight when I get off. I'm going to check all the connections. Hopefully mine will work when I put it back in. I guess I'll use my JDM cluster while my GS-R one is out.

 

I know this post is old, but it wasn't the cluster. Haven't worked on the car in a while, but it's still not working.

 

i seem to have the same problem on my stock tach. the rpm gauge will read fine until i hit vtec and then the needle stalls for a second but the needle can not catch up to the actual rpms of the engine. im want to get this fixed cuz im afraid of over-revving the motor.

 

sometimes a loose ground will cause that ...

greg

 

do u have white faced gauges or anything
my friend put in white faced gauges wrong and they pushed on the needle and when it was cold out it wouldnt go up either fast enough or at all.