Tach way far out!!!!

[XfireZ51]

Hard for me to believe that 3500rpm could be mistaken for 6k. I would double check using a scan tool to confirm rpms.

[ghlkal]

Originally Posted by XfireZ51

I would double check using a scan tool to confirm rpms.

Yup ... I really want to. The first tech 1 I purchased was defective and I'm on the lookout for another.

Originally Posted by Paul Workman

I'd try the cal approach first and see where we are after that.

Yes, hopefully soon, but I would rather have the scan tool to be sure first. And, Paul, I hope it's just the resistor too

[ghlkal]

I just want to bring closure to my tach story …

I did replace the pot with 220K ohm worth of resistors. I used one 220K plus three 1K ohm resistors in series. Because they are +- 5%, the 223K stated value was actually 220K. The tach works great now!


For future reference, you might want to check out CCM diagnostics http://www.zr1.net/forum/showthread.php?t=17846

Using your HVAC as a tach
http://www.zr1.net/forum/showthread.php?t=17799

And, of course, check out -Solutions-
http://www.zr1.net/forum/showthread.php?t=16778

Thanks for everyone’s input!

Gary