my tach
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Junior Member
Joined: Jan 2004
Posts: 47
Likes: 0
From: orlando, fl
Car: 1991 z28
Engine: 5.7
Transmission: 700r4
my tach
hey yal my tach is off by like 1500-2000 rpms when im driving I dont know what would cause this possibly a bad connection? Any input would be appreciated.
Supreme Member
Joined: Mar 2001
Posts: 6,577
Likes: 0
From: Portland, OR www.cascadecrew.org
Car: 1990 Camaro RS
Engine: Juiced 5.0 TBI - 300rwhp
Transmission: T5
Axle/Gears: 3.42 Eaton Posi, 10 Bolt
common problem, they go bad.
when i am racing, i wait for the tach to peg, then give it a good 2 mississippi
when i am racing, i wait for the tach to peg, then give it a good 2 mississippi
Member
Joined: Sep 2002
Posts: 234
Likes: 0
From: Jacksonville, Tx
Car: 91 RS, 00 TA Ram Air, 86 IROC
Engine: 305 tbi, LS1, 355
Transmission: 700R4, 4L60E, 700R4 NonLU
The tach is bad. Mine used to show about 1800 to 2000 rpms at idle. It was the excuse I used with my wife to buy the Z-28 instrument panel with the big speedo. It works like a charm now.
Junior Member
Joined: Apr 2003
Posts: 36
Likes: 1
From: Empire State
Car: 1991 Z/28
Engine: 5.7 TPI
Transmission: 700R4
Same trouble in my 91 Z 5.7 Tuned Port car. The Tach worked perfectly until i installed a factory replacement motor. Then suddenly, same problem you guys are having. I was looking through my 1991 chev camaro service manual and it says there is a tach filter in line with the tach to help filter out "spikes and irregularities." It kind of makes sense because I installed an aftermarket Accel coil during the new install. I was going to try eliminating said filter, but i'll be damned if i can find it, even with a detailed schematic..... Hopefully I was of some help here; PLEASE let me know if any of you have any luck!
~Shotz~
~Shotz~
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