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Haltech Why is my tach bouncing around?

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Old 11-13-02, 12:30 AM
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Why is my tach bouncing around?
Ok, so my car is running just great, thanks to Jay, the master tunner! I noticed yesterday that when I get on the throttle hard, my tach starts to bounce around. WHAT THE HELL IS GOING ON? It's bouncing around like 1000-2000 rpm incriments!

waht do you all think?
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Old 11-13-02, 08:21 AM
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check all the wiring. probably a loose connection.
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Old 11-13-02, 12:34 PM
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are you using the haltech tahco output?

mike
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Old 11-13-02, 01:03 PM
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Hey Adrian, check your pm
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Old 11-23-02, 07:38 AM
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You need to ground it properly.
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Old 11-23-02, 08:29 AM
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same thing happens to me
I've been told you need a resistor on the coil Tach signal

I've yet to try it myself since my car is down for upgrades
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Old 11-23-02, 02:59 PM
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is the engine loosing a bit of power when this happens?

if it is, the CAS is starting to die, this happened to me a few months ago
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Old 11-24-02, 08:10 AM
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On mine if I'm crusing at 3k the tach would start jumping back and forth to 7k

But the car drives normal
It use to die when it did this till I hooked up the ground wire that is by the Haltech ECU
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