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| TACH READS ABOUT THREE TIMES WHAT IT SHOULD (Page 1/1) |
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eti engineer
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DEC 01, 10:06 AM
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Gents,
I forgot to ask one thing. My tach reads about three times what my actual engine rpms are. I replaced the tach filter, but it didn't make a difference. What else could be causing this? I am trying to think what would cause the tach to receive three times the number of pulses it would normally get, or what would make the tach think that that's what is happening. BTW, I replaced the tach filter already...
Thanks...[This message has been edited by eti engineer (edited 12-01-2020).]
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Dennis LaGrua
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DEC 01, 10:32 AM
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Could the tachometer needle have slipped on the gauge shaft? Its also possible that the tach filter has dried out over time and is not functioning properly. Is this for a stock Fiero?
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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE " [This message has been edited by Dennis LaGrua (edited 12-01-2020).]
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eti engineer
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DEC 01, 11:34 AM
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| quote | Originally posted by Dennis LaGrua:
Could the tachometer needle have slipped on the gauge shaft? Its also possible that the tach filter has dried out over time and is not functioning properly. Is this for a stock Fiero?
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Yes. The tach needle seems to be correct. I replaced the tach filter and the results didn't change.
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theogre
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DEC 01, 12:50 PM
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Likely Tach board has problems
loose/dirty connections in the dash can mess w/ tach and other gauges.
has caps and maybe resistor that "dies" and doesn't displays right often reading high to very high. Can try fixing but best is to get new board.
use search------------------
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)
The Ogre's Fiero Cave
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peterh
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DEC 01, 05:34 PM
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Same thing happened on my 1986 SE over the years, it currently idles at 6000!
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eti engineer
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DEC 02, 09:56 AM
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| quote | Originally posted by theogre:
Likely Tach board has problems
loose/dirty connections in the dash can mess w/ tach and other gauges.
has caps and maybe resistor that "dies" and doesn't displays right often reading high to very high. Can try fixing but best is to get new board.
use search
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Thanks for the input. I will check all this out, once I get an engine back in my car. Working on doing that right now.[This message has been edited by eti engineer (edited 12-02-2020).]
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eti engineer
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DEC 02, 09:59 AM
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| quote | Originally posted by peterh:
Same thing happened on my 1986 SE over the years, it currently idles at 6000! |
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If you get to the bottom of your problem, please PM me and let me know what you found, and if I get to mine first, I will do the same for you. Have a good day at 6000 rpm...
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fierosound
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DEC 02, 12:37 PM
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