Ls1 tach issues...
06-23-2007, 01:28 AM
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Car: 1989 TRANS AM
Engine: 2004 GTO LS1
Transmission: 4L60E
Axle/Gears: 02 ws6 torsen diff 3:42
Ls1 tach issues...
can't get my tach to work!!!! runnin the 04 gto motor, pin 25 of c206 is tach signal, well i hooked it up to my stewart warner tach, set to 4cyl mode. i don't get no movement at all from the guage. i set it to 8cyl mode, same crap...anyone got ideas? i tried some searches but came up empty handed.
06-23-2007, 10:54 AM
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Car: Camaro
Engine: 6.2L
Transmission: T56
Re: Ls1 tach issues...
Haha yup... Same here brand new Autometer pro comp and same b/s had me foiled for a while... Tried everything too. Called Autometer tech support and verified my wiring was okay and would have sent it back too if it wasn't such a pain to do so from Canada. After endless searches I found an answer.
Solution was to boost the signal from the PCM to the tach. It seems the output is not strong enough to power many aftermarket tachs so I put a 10K resistor to 12V+ ign and spilced that into the tach signal feed from the PCM to the tach and bingo shes alive.
I bought a pack of five resistors from Circuit city for five bucks.
Solution was to boost the signal from the PCM to the tach. It seems the output is not strong enough to power many aftermarket tachs so I put a 10K resistor to 12V+ ign and spilced that into the tach signal feed from the PCM to the tach and bingo shes alive.
I bought a pack of five resistors from Circuit city for five bucks.
06-23-2007, 05:20 PM
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Car: 1989 TRANS AM
Engine: 2004 GTO LS1
Transmission: 4L60E
Axle/Gears: 02 ws6 torsen diff 3:42
Re: Ls1 tach issues...
i'll give it a shot,...hmm RIGHT NOW!!! lol... 
06-23-2007, 05:55 PM
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Car: 1989 TRANS AM
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Transmission: 4L60E
Axle/Gears: 02 ws6 torsen diff 3:42
Re: Ls1 tach issues...
Perfect!! thanks man.
oh by the way....Radio shack, 5 pack of 10k ohm resistors, $1.08
oh by the way....Radio shack, 5 pack of 10k ohm resistors, $1.08
05-08-2012, 08:33 AM
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Car: Firebird 89
Engine: Ls1 corvette 03
Transmission: T56
Re: Ls1 tach issues...
hello, let me explain my situation. I bought a 89 firebird with a LS1 engine. the previous owner had installed an aftermarket tachometer 5 inch. I removed that big gauge, but my original cluster has a disorder. Watch the youtube video to understand my prob.
http://www.youtube.com/watch?v=CqwVG...ature=youtu.be
(sorry the video dosen't have sound)
..... The original cluster and the aftermarket gauge are both connected to the tach adapt model 9117 made by Autometer, so the original cluster receives the signal from the tach adapter. Unless the rpm drop to 0 when I presses on the accelerator the rpm indicated is the same as the aftermarket tach. does anyone have a solution. Thank you.
http://www.youtube.com/watch?v=CqwVG...ature=youtu.be
(sorry the video dosen't have sound)
..... The original cluster and the aftermarket gauge are both connected to the tach adapt model 9117 made by Autometer, so the original cluster receives the signal from the tach adapter. Unless the rpm drop to 0 when I presses on the accelerator the rpm indicated is the same as the aftermarket tach. does anyone have a solution. Thank you.
05-08-2012, 09:49 AM
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Car: 89 IROC-Z
Engine: 370 LSX, LS3 Top End
Transmission: Built T-56
Axle/Gears: 9" Aluminum Center 3.89's
Re: Ls1 tach issues...
Haha yup... Same here brand new Autometer pro comp and same b/s had me foiled for a while... Tried everything too. Called Autometer tech support and verified my wiring was okay and would have sent it back too if it wasn't such a pain to do so from Canada. After endless searches I found an answer.
Solution was to boost the signal from the PCM to the tach. It seems the output is not strong enough to power many aftermarket tachs so I put a 10K resistor to 12V+ ign and spilced that into the tach signal feed from the PCM to the tach and bingo shes alive.
I bought a pack of five resistors from Circuit city for five bucks.
Solution was to boost the signal from the PCM to the tach. It seems the output is not strong enough to power many aftermarket tachs so I put a 10K resistor to 12V+ ign and spilced that into the tach signal feed from the PCM to the tach and bingo shes alive.
I bought a pack of five resistors from Circuit city for five bucks.
12v------resistor------"T" into signal wire?
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05-08-2012, 01:35 PM
#8
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Re: Ls1 tach issues...
Just so you know the firebird original tach wire will not work using the 10k resistor booster method.
I have my original tach and a autometer tach wired in and working off of the ls1 pcm.Original tach reads about 200rpm lower at all times.I just used a diode to prevent either tach from possibly back feeding eachother.
http://www.ls1tech.com/forums/conver...t-correct.html
I have my original tach and a autometer tach wired in and working off of the ls1 pcm.Original tach reads about 200rpm lower at all times.I just used a diode to prevent either tach from possibly back feeding eachother.
http://www.ls1tech.com/forums/conver...t-correct.html
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