 Tach problem |
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| jd66921 |
 Aug 3 2006, 06:06 PM
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#1
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Member  Group: Members Posts: 316 Joined: 9-January 06 From: Texas Member No.: 5,394  |
Hi,
My tach decided to die on me, I think. It has always been bouncy, but usually settled down after a little while. Last week, it died, no reading at all. Now it has come back to life somewhat. It seems to read ~1/2 what it should. So, I am trying to decide if it is really bad, or whether it might not be the tach itself. I have gone through all the wires and they seem to be tight. Do you think a new one is the right thing to try? I don't have a spare... Thanks, Jeff |
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| Cap'n Krusty |
Aug 3 2006, 06:12 PM
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#2
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
/4 or /6? If /4, points or electronic ignition? Any aftermarket ignition unit? If a 6, stock ignition with BHKZ, or aftermarket, with or without the tachometer drive unit. The Cap'n
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| jd66921 |
Aug 3 2006, 06:17 PM
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#3
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Member Group: Members Posts: 316 Joined: 9-January 06 From: Texas Member No.: 5,394 |
QUOTE(Cap'n Krusty @ Aug 3 2006, 05:12 PM)  /4 or /6? If /4, points or electronic ignition? Any aftermarket ignition unit? If a 6, stock ignition with BHKZ, or aftermarket, with or without the tachometer drive unit. The Cap'n It figures that I never ask the right questions!! (IMG:style_emoticons/default/huh.gif) A stock 1.8 l/4 with points. L-Jet, no mods! |
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| Dave_Darling |
Aug 3 2006, 07:04 PM
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#4
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914 Idiot Group: Members Posts: 14,985 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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If the car is running fine, then either your tach took a dump on you or the wires are messed up. Unplug the tach wire from the tach and the coil, and see if it connects to ground at all. If there is any connection whatsoever, the wiring is suspect. If not, then the tach is.
--DD |
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| jd66921 |
Aug 3 2006, 07:11 PM
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#5
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Member Group: Members Posts: 316 Joined: 9-January 06 From: Texas Member No.: 5,394 |
QUOTE(Dave_Darling @ Aug 3 2006, 06:04 PM) If the car is running fine, then either your tach took a dump on you or the wires are messed up. Unplug the tach wire from the tach and the coil, and see if it connects to ground at all. If there is any connection whatsoever, the wiring is suspect. If not, then the tach is. --DD Would that lead it to read weird? That's what's bugging me! Does anyone have a schematic of the tach itself? It's a pain to open it!! What kind of a signal does the tach expect? I'll check the wiring some more again tomorrow... Thanks! Jeff |
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| r_towle |
Aug 3 2006, 07:28 PM
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#6
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Custom Member Group: Members Posts: 24,574 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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Start easy...
make sure the wires to your coild are firmly connected and they are not touching the engine...i.e. the coild wiggles loose and turns..the wires touch... BTDT.. Rich |
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| brant |
Aug 3 2006, 08:18 PM
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#7
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914 Wizard Group: Members Posts: 11,623 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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Jeff,
have you changed points lately? I've seen weird readings like that from my car when it used to have points and things were in need of attention. check your point gap and set the dwell brant |
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