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| how to check tach filter (Page 1/1) |
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Wayne Renninger
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OCT 08, 02:37 PM
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Is there a way to check tach filter? Tach jumps all over when starting and pegs under accelaration? Or is it bad tach?
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82-T/A [At Work]
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OCT 08, 04:20 PM
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| quote | Originally posted by Wayne Renninger:
Is there a way to check tach filter? Tach jumps all over when starting and pegs under accelaration? Or is it bad tach? |
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I think the only other way is to bypass it... and see if it stops "floating," though it could be inaccurate.
Definitely sounds like a bad tach filter, not the tach though. Could also be a bad ground...
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Dennis LaGrua
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OCT 11, 10:10 PM
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Take it out of the circuit and replace it with a bare wire. The tach should work but better than it has been,
The filter effectively blocks high-frequency ignition noise so only clean ignition pulses are sent to the tach. If you have an extra just replace it and see,------------------
" 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.
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87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
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