Tach problems 89 Camaro
Tach problems 89 Camaro I have an 89 IROC originally LO3 305 TBI. I have swapped in an 03 6.0 LQ9. I have my stock tach connected to PCM C2 (green) pin 10 (white); it’s labeled as Engine Speed Signal. But I’m not getting anything on my tach. It will jump when I turn the key on but nothing after that. The tach was working before so I don’t think that it's bad. I have done a lot of research and searching and this is how I understood that it needed to be connected. Am I missing something?
Thanks,
Ryan
Thanks,
Ryan
Joined: Nov 2001
Posts: 1,707
Likes: 33
From: Anderson, Indiana
The 03 and up truck PCM's have a different tach signal output and a lot of factory tachs won't work directly from it. If you add a 5000 ohm pull up resistor between a 12 volt ignition line and the tach signal wire, you tach should come right to life.
__________________
91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
Originally Posted by Speartech
The 03 and up truck PCM's have a different tach signal output and a lot of factory tachs won't work directly from it. If you add a 5000 ohm pull up resistor between a 12 volt ignition line and the tach signal wire, you tach should come right to life.
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Verdad Gallardo Joined: Nov 2001
Posts: 1,707
Likes: 33
From: Anderson, Indiana
Yes it's the same. You can either add the resistor or you can also activate it in the tune.
__________________
91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
Thanks
Joined: Nov 2001
Posts: 1,707
Likes: 33
From: Anderson, Indiana
You can enable tach pull-up in LS1 Edit in the engine test parameters section. If that's not in your software editor, you would need to go the resistor route.
__________________
91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
