 Calibrating tach |
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 Jan 5, 2012 - 6:27 PM
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 Enthusiast  Joined Nov 13, '10 From Greenville, SC Currently Offline Reputation: 50 (100%)  |
I bought a "plug-n-play" tach from FORGMANN for the BEAMS swap, but it's all wrong. When I turn the ignition to ACC, it tells me the car is revving at 3k. When I crank it up and drive, it seems to add rpm's at the right rate... They just start at 3k. So I'm idling around 4k. How do I fix it? I tried searching and searching, but I'm running out of ideas. Thanks guys!
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Jan 5, 2012 - 7:18 PM
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 Moderator Joined Jun 29, '08 From Denver Currently Online Reputation: 59 (100%) |
Sounds like a ground issue. I had a bad ground in my project car a while back. When I turned my lights on, apparently I was revving to 2k. When I hit my brights, it was 4k. I never figured out which ground it was, but I'd check all the engine grounds just in case.
-------------------- "Employ your time in improving yourself by other men's writings, so that you shall gain easily what others labored hard for." -Socrates. Even Socrates told us to use the search button!
 2006 Aston Martin V8 Vantage. 1998 Celica GT- BEAMS Swapped. 2022 4Runner TRD Off Road Prenium. 2021 GMC Sierra AT4. |
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Jan 5, 2012 - 8:52 PM
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Enthusiast Joined Nov 13, '10 From Greenville, SC Currently Offline Reputation: 50 (100%) |
Blast! Where can I find the grounding info? Should I try flipping lights and such to see if it makes a difference?
QUOTE (richee3 @ Jan 5, 2012 - 7:18 PM)  Sounds like a ground issue. I had a bad ground in my project car a while back. When I turned my lights on, apparently I was revving to 2k. When I hit my brights, it was 4k. I never figured out which ground it was, but I'd check all the engine grounds just in case. |
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Jan 31, 2012 - 6:42 PM
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 Enthusiast Joined Jun 5, '07 From Santa Maria Currently Offline Reputation: 1 (100%) |
I had this issue with my stock tach after removing the needle (lesson learned). That little peg the needle rests on is there for a reason lol. My fix was pulling the needle, turning the key to ACC, then putting the needle back on at the zero position. I doubt this is your issue tho...
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