i believe i've read every "bouncing tach" post there is and have tried all the suggestions.. also, none of them are quite like my situation... here's the rundown:

car tuned fine. 3-bar MAP, hondata, tuned @ church automotive.
get home, hook 3-bar back up (had to drive home with uberdata tune 'cause we had only one 3-bar to tune with).
all of a sudden the car starts cutting out and not driving right. i can't give it gas, it will barely move. i can't remember if it idled right or not. so, i put on my friend's 3-bar and plug (i don't have the three-wire plug yet, so i just had male connectors and wires plugged in) and everything seemed to work okay. no problems. i then put my MAP back in with his plug and it works. so, i figure it's my ghetto wiring harness that i made. i borrow my friend's harness and all is good again. until i notice the tach jumping up and down about 1500rpm. all the way up to 7-9k if i give it more gas. i also notice the car sounds like it's pinging while accelerating.
so, i figure it's the ignitor in the dist. so i try a new dist. nope. still doesn't work. now it only does it when i boost hard. but if i shut the car off, then back on again everything is fine 'till i boost again. so i put my old dist back in.
then, i put in an old uberdata chip and run my stock MAP. nope. still does it. the only other thing i see different is that my A/F gauge doesn't do the pretty back and forth thing anymore. it just kinda stays in one place and moves a bit as i accelerate and decelerate. not sure if this is another symptom? the A/F has always gone back and forth while driving steady and goes rich while accelerating. oh, and now it bounces the whole time, not only after boosting. shutting the car off doesn't seem to help. it's like it's getting worse and worse. i'm stumped.
i changed the VSS recently. not a new one, a used one. could that be it? could it be the wire harness side of the MAP? we had to t-tap into the harness to tune with the 3-bar, then unplug it so i could home on stock MAP/uberdata. i have a wire tapped into my harness on the dist for my alarm. it's supposed to read the tach signal for my remote start (which doesn't work either). could THAT be it? the wire looked a bit frayed, so i spliced in a new one.
we have no clue what else to check for.

obd-1 b16, GSR dist, stock ignition, etc.

 

VSS has nothing to do with a bouncing tach, forget that tidbit.

You have a ground problem.

 

the one coming from the distributor, i'm guessing? it grounds to the thermostat housing, correct? i'm gonna go check NOW.

i didn't really think it was the VSS... i was just grasping at straws 'cause this car has me so mentally exhausted i can't think straight.

thanks for bearing with me through another "bouncing tach" post.
i just tried all the other advice from the other posts.. and nothing helped. hoping this can help out the next guy how throws on a new dist and still has probs.

i'll post when/if i find the answer.

 

Grounding kits are a little gay but I had a bouncing tach and then no more after installing one.

 

gotta get to bed for work. short version:

checked dist ground. looked fine. wires didn't move.. bolt wasn't THAT tight.... looked a bit dirty. had a file to clean up terminal, etc. bolt wouldn't back out all the way.. started to put it back on *SNAP* went the bolt. it was corroded to the point that i couldn't take it out.
so i, luckily, have extra "honda bolts" throughout my engine bay... and i grounded it to a spot next to the original one.

*poof*

problem solved. i can't believe that was the problem. especially after checking it once already

 

Yup yup. Owned by G101, or G151 depnding on your chassis.

 

Kickass.......

 

[southpark] Kickass......... [/southpark]

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kaj &raquo;</TD></TR><TR><TD CLASS="quote">

problem solved. i can't believe that was the problem. especially after checking it once already </TD></TR></TABLE>

You had the exact same problem I did 2 years ago. Stupid grounds!!

 

I agree , check your grounds...