bouncing tach dilemma
#1
Rotary Enthusiast
Thread Starter
Join Date: Aug 2001
Location: Memphis, TN - wishin' i was back in Ft Worth
Posts: 1,024
Likes: 0
Received 1 Like
on
1 Post
bouncing tach dilemma
hey guys,
i have an '85 GSL-SE and lately the tach has been bouncing around from idle up to 6500rpm. it changes and sometimes stops when i put a load on it, as in press the brake or turn on headlights. i have swapped out the coil and also the cap and rotor. i've even swapped the leading and trailing coil plug wires(racing beat wires) to the distributor and no luck.
it started after i had a problem with the car starting which was the factory aluminum wiring and the battery terminal. one of the guys at work pulled some slack out of the positive wire and put a new terminal on it and thats when it started. he has tried to move some of the wiring to fix it and as stated before, i've swapped out the coil and cap/rotor and cannot come up with anything. i would like to resolve this w/out having to swap out the tach. its getting the signal to bounce around somehow. or maybe its just fried and i have to replace it.
any helpful ideas?
i have an '85 GSL-SE and lately the tach has been bouncing around from idle up to 6500rpm. it changes and sometimes stops when i put a load on it, as in press the brake or turn on headlights. i have swapped out the coil and also the cap and rotor. i've even swapped the leading and trailing coil plug wires(racing beat wires) to the distributor and no luck.
it started after i had a problem with the car starting which was the factory aluminum wiring and the battery terminal. one of the guys at work pulled some slack out of the positive wire and put a new terminal on it and thats when it started. he has tried to move some of the wiring to fix it and as stated before, i've swapped out the coil and cap/rotor and cannot come up with anything. i would like to resolve this w/out having to swap out the tach. its getting the signal to bounce around somehow. or maybe its just fried and i have to replace it.
any helpful ideas?
#5
...94% correct.
I've seen two FB's do this periodically. One was a mint car...pretty nice. I think there's something in the guage cluster that works it's way loose of something over time. If it were a coil I would think you'd notice a diffeence in performance.
#6
Full Member
Join Date: Aug 2003
Location: Bozeman, MT
Posts: 102
Likes: 0
Received 0 Likes
on
0 Posts
My FB was only a couple years old and had hardly any miles when I bought it and the tach has always bounced. I never have figured it out. I know it wasn't the ingnitors because I replaced them. I agree with Makenzie71. I think it's probably the tach itself that has a problem. Eventhough the tach bounced the engine always ran very smooth.
#7
Anything related to the trailing ignition. Good time to clean off the spade connector to your coil.
inittab is right. The tach gets it's signal from the trailing coil so your answer very likely lies there.
F-
inittab is right. The tach gets it's signal from the trailing coil so your answer very likely lies there.
F-
Trending Topics
#8
brilliantly stupid
Join Date: Nov 2002
Location: Rockford, IL
Posts: 1,100
Likes: 0
Received 0 Likes
on
0 Posts
I've noticed that mine does it when it starts to get cold. I just figure something in the gauge cluster is just old and the cold is have a negative effect on it
#9
Rotary Enthusiast
Thread Starter
Join Date: Aug 2001
Location: Memphis, TN - wishin' i was back in Ft Worth
Posts: 1,024
Likes: 0
Received 1 Like
on
1 Post
the connections on the coils have already been done.
didn't work. i haven't tried the ignitor yet. i was supposed to today but drove my FD to work. taking the SE tomorrow....well, today
didn't work. i haven't tried the ignitor yet. i was supposed to today but drove my FD to work. taking the SE tomorrow....well, today
Thread
Thread Starter
Forum
Replies
Last Post
befarrer
Adaptronic Engine Mgmt - AUS
3
09-22-15 09:33 AM