Ok as im driving down the road at lets say 70 the car will periodicly have a miss, and when it misses i noticed that the tach drops off everytime... wat would cause this, does the tach get its signal from the leading coil, cause i think mine has some kinda problem with it, cause sometimes the car will idle perfect, and then i will idle like crap and when it idles like crap you can pull the l2 plug wire and it dosent make a change....

Well anyways is it the coil or something else??? thanx

 

I've *heard* that the tach gets it's signal from the trailing coil--but when I had my leading coil grounded incorrectly the tach would drop on misses as well...

 

how do you have something grounded wrong? anyways is there anyway to diagnose this hard miss im getting?

 

anything else on this prob?

 

Yes, the TACH gets its signal from the trailing coils - the FSM wiring diagrams will confirm this.
This is NOT a myth.
So either your wiring is screwed, the trailing coils are screwed, or the stock ECU is screwed.


-Ted

 

The trailing coils not functioning properly woudnt make it have a hard miss going down the road would it, but i do know that when it misses going down the road that the tach drops off....? Also it seems to have a constant miss while its idleing every couple of seconds... O and im running the rtek 1.7 too, anymore ideas on this?

 

There could be a short somewhere. My TACH would miss DRAMATICALLY and the motor would drop revs violently when I had a live 12V wire shorting out above my turbo... But like I said, this was very violent and actually blew out my EGI COMP fuse several times before I found the shorted wire.