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#1
10-23-2009, 10:47 AM
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Tack On The Fritz
My tackometer works most of the time. However, occasionally I will look down and I have lost the Tack. I have a 2001 Buick Park Avenue with a 3.8L engine. Most recently I had to turn off the key to reset the Tack. I could use some feedback on possible ways to troubleshoot this problem.
Thanks Last edited by drillermitch; 10-23-2009 at 12:57 PM. 
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#2
10-26-2009, 08:43 PM
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Re: Tack On The Fritz
You need a wiring diagram for a 2001. It could be a cluster problem, but it might be a bad wire or bad connection. For a '97, the tach reads from a wire (white) that comes from near the ignition module and coils. It reads from the crank position sensor. It sends a signal to the ECM to tell it rpms and crankshaft position. If the circuit fails, it should set a code, or the engine will stumble and not start. Have any codes? If not, it may be the tach gauge itself. I had to replace my instrument cluster due to a jumpy tach and speedometer.
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#3
10-27-2009, 09:32 PM
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Re: Tack On The Fritz
I have no codes. It might be the instrument cluster. Especially if you had a jumpy tack and repaired the problem with a new cluster. Thanks for the reply.
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#4
10-27-2009, 09:47 PM
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Re: Tack On The Fritz
Mine would always work, but it jumped and kind of skipped. From what I recall, it was never completely dead. Could even be there is a bad connection somewhere, possibly between the ECM and the gauge. There may be a way to read the tach wire with a digital voltmeter. I ended up putting in a salvaged cluster. My speedometer would go from 0 to 20 while sitting still at a stoplight.
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#5
10-29-2009, 10:50 AM
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Re: Tack On The Fritz
Thanks for the feedback smith1000. Mine works flawlessly but has occasional total shutdowns. It could be the wire. I will check the 2001 wiring diagram and make sure the wire from ECM is connected and has continuity. Beyond that my thought is that the cluster is having issues. I had a 2003 Avalanche with speedometer issues and we replaced the cluster and my problems went away. Have a great day.
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#6
11-05-2009, 09:23 AM
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Re: Tack On The Fritz
Sir,
I had a *speedometer* problem on our '97. The problem turned out to be a bad connection on the IPC circuit board. In our case both the speedometer and odometer quit from time-to-time. I put it on the bench and applied +12V and generated an artificial speedometer signal to find the problem. In solving the intermittency, I also found that the speedometer was off in speed. The specs say +/- 4 MPH and I guess that explains it. Likely the tach can also err by some amount. Regards, Jack C.
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