Tach bouncing around??
Thread Starter
Instructor
Joined: Aug 2007
Posts: 176
Likes: 0
From: Auburn MA
Tach bouncing around??
Just finished the motor swap, so i took the car for a ride today. It drives awesome except when i rev over 3,500 the tach starts bouncing like crazy.
Is this a problem with the Tach Filter? What does the filter look like, and is it replacable?
Is this a problem with the Tach Filter? What does the filter look like, and is it replacable?
Drifting
Joined: Aug 2006
Posts: 1,326
Likes: 18
From: Los Angeles California
As late as your C4 is I don't know that it even has a tach filter. The tach signal comes from the Opti low and high resolution sensors, not related to the high-voltage section. Failure of these will make the tach needle oscillate wildly around the correct value, and if it's like mine will eventually lead to bucking, shutting off, and not starting. Did your opti get wet?
Thread Starter
Instructor
Joined: Aug 2007
Posts: 176
Likes: 0
From: Auburn MA
Opti is a brand new MSD pro billet unit, and did not get wet
Also the computer was swapped out for a custom tuned unit from PCMforless. Not sure if the computer has anything to do with it, but i figured i'd throw that out there.
all help is appreciated !
Also the computer was swapped out for a custom tuned unit from PCMforless. Not sure if the computer has anything to do with it, but i figured i'd throw that out there.
all help is appreciated !
Last edited by Soon2Bcammed; Nov 21, 2007 at 10:32 PM.
